2024-03-29T13:07:44Z
https://pub.uni-bielefeld.de/oai
oai:pub.uni-bielefeld.de:1773979
2018-07-24T12:58:58Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Sexual imprinting in female zebra finches: changes in preferences as an effect of adult experience
Oetting, Sabine
Bischof, Hans-Joachim
Development
Behavior
Ecology
Reproduction
ddc:590
Oetting S, Bischof H-J. Sexual imprinting in female zebra finches: changes in preferences as an effect of adult experience. <em>Behaviour</em>. 1996;133(5):387-397.
It has been shown that sexual imprinting in male zebra finches can be seen as a two stage process with an early acquisition period, where a sexual preference is established, and a consolidation process, where the early acquired preference is linked to sexual behaviour and stabilized. The consolidation process can, by the appropriate experimental design, be delayed until adulthood. In the course of consolidation, the initial preference for the foster species can be altered by exposure to a female of another species. Our results indicate that sexual imprinting in females is also a two stage process. In contrast to males, the consolidation period, at least under the experimental design used in this study, is longer than that obtained for males. It is speculated that the speed of consolidation could be enhanced by additional stimuli influencing female mate choice, as for example breeding facilities.
Brill
1996
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739797
https://pub.uni-bielefeld.de/record/1773979
https://pub.uni-bielefeld.de/download/1773979/2311354
eng
info:eu-repo/semantics/altIdentifier/doi/10.1163/156853996X00512
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/altIdentifier/issn/1568-539X
info:eu-repo/semantics/altIdentifier/wos/A1996UT82600004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1773985
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Sexual imprinting as a two-stage process: mechanisms of information storage and stabilization
Oetting, Sabine
Proeve, Ekkehard
Bischof, Hans-Joachim
Ecology
Behavior
Endocrine System
Metabolism
Reproduction
ddc:590
Oetting S, Proeve E, Bischof H-J. Sexual imprinting as a two-stage process: mechanisms of information storage and stabilization. <em>Animal Behaviour</em>. 1995;50(2):393-403.
Sexual imprinting occurs in two stages, an acquisition phase when the birds learn about their social environment, and a consolidation process where the acquired information is linked to sexual behaviour and stabilized. Some of the factors that may influence acquisition and consolidation, respectively. were examined. Zebra finch, Taeniopygia guttata, males were reared by Bengalese finch, Lonchura striata, foster parents until 40 days of age, then isolated for 60 days, and exposed to a zebra finch female for 1 h at day 100. Thereafter, the birds were isolated for 3 days and then exposed to a Bengalese finch female for another 1 h. In subsequent preference tests, the preference scores of the birds were correlated with how much they were fed by their foster parents. The influence of the first exposure to a zebra finch female correlated positively with the level of arousal of the experimental males, as indicated by measurements of displacement activities and corticosterone levels. When first exposed to a female as adults, the experimental males could learn features of a potential sexual partner and, simultaneously, the acquired preference was consolidated. Consolidation, however, was independent of the appearance of the female: after having a 24-h access to a nestbox on day 99, the experimental males developed an exclusive preference for Bengalese finches. These results confirm that acquisition and consolidation are different processes which can be separated at least by the appropriate experimental design.
Elsevier BV
1995
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739853
https://pub.uni-bielefeld.de/record/1773985
https://pub.uni-bielefeld.de/download/1773985/2311355
eng
info:eu-repo/semantics/altIdentifier/doi/10.1006/anbe.1995.0254
info:eu-repo/semantics/altIdentifier/issn/0003-3472
info:eu-repo/semantics/altIdentifier/wos/A1995RP91600011
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1773989
2018-07-24T12:59:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Visual wulst influences on flash evoked responses in the ectostriatum of the zebra finch
Engelage, Jürgen
Bischof, Hans-Joachim
Nervous System
Sense Organs
Sensory Reception
Neural Coordination
ddc:590
Engelage J, Bischof H-J. Visual wulst influences on flash evoked responses in the ectostriatum of the zebra finch. <em>Brain Research</em>. 1994;652(1):17-27.
Anatomical data suggest that visual information from the thalamofugal pathway contributes to visual processing in the tectofugal pathway. We addressed the question of the functionality of anatomically described connections to the visual system of a laterally eyed bird, the zebra finch. The study shows the contribution of visual wulst efferents to visual processing in the ectostriatum by recordings of visually evoked slow field potentials. Suppression of visual wulst activity resulted in a selective reduction of distinct potential components in contralaterally evoked slow field potentials. A clear reduction was observed in the maximum amplitude of short latency components in the negative wave. Long latency components of the negative wave and the entire positive wave of the contralaterally flash evoked potentials were almost abolished. Ipsilateral visual evoked potentials (VEPs) were not significantly affected. Cooling and spreading depression of the optic tectum resulted in a uniform amplitude reduction of the negative wave. The positive wave was almost abolished. Ipsilateral VEPs disappeared completely during suppression of optic tectum activity. The results showed that the visual wulst has a significant, most likely facilitatory, influence on the processing of contralateral visual information in the ectostriatum. Ipsilateral stimulus processing was partly independent from visual wulst activity. A model for thalamo- and tectofugal connectivity in the ectostriatum is suggested.
Elsevier BV
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739890
https://pub.uni-bielefeld.de/record/1773989
https://pub.uni-bielefeld.de/download/1773989/2311356
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(94)90312-3
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1994NY40700003
info:eu-repo/semantics/altIdentifier/pmid/7953718
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1773992
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Spine morphology of neurons in the Avian forebrain is affected by rearing conditions
Rollenhagen, Astrid
Bischof, Hans-Joachim
Morphology
Behavior
Neural Coordination
Cell Biology
Development
ddc:590
Rollenhagen A, Bischof H-J. Spine morphology of neurons in the Avian forebrain is affected by rearing conditions. <em>Behavioral and Neural Biology</em>. 1994;62(2):83-89.
An area of the caudal forebrain of male zebra finches, the Archi-Neostriatum caudale (ANC), which is active during arousal (Bischof and Herrmann, 1986, 1988), shows rearing-dependent changes in neuron morphology (Rollenhagen and Bischof, 1991). We demonstrate here that rearing conditions also affect the shape of spines of one of the four ANC neuron types. This neuron type was examined in birds reared under five different conditions - in isolation (1), caged (2), in the aviary (3), and with social contact (4) or chasing (5) after an isolation period. Our results show that social experience determines the proportion of the three types of spines (thin, mushroom, and stubby) of the investigated neuron type. Rearing conditions and short social contact also affect the spine stem length of the thin spine type. Long-term isolation results in a reduction in number and elongation of shafts of thin spines, along with an increase of stubby-and mushroom-shaped spines. Short-term social contact or arousal enhances the number of mushroom- and thin-shaped spines and reduces the length of spine stems of thin spines. We suggest that isolation prevents the ANC neuron from reaching full development. The increase of mushroom and thin spine types due to social contact indicates that the stubby-shaped spines are replaced by, or transformed into, mushroom-shaped spines, and the mushroom-shaped spines are replaced by, or transformed into, thin spines. These results confirm and extend the experimental background for our hypothesis (Rollenhagen and Bischof, 1991) that social contact is necessary for development of normal morphology of ANC neurons.
Elsevier BV
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739927
https://pub.uni-bielefeld.de/record/1773992
https://pub.uni-bielefeld.de/download/1773992/2311357
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0163-1047(05)80029-9
info:eu-repo/semantics/altIdentifier/issn/0163-1047
info:eu-repo/semantics/altIdentifier/wos/A1994PD17800001
info:eu-repo/semantics/altIdentifier/pmid/7993307
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1773995
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Phase specific morphological changes induced by social experience in two forebrain areas of the zebra finch
Rollenhagen, Astrid
Bischof, Hans-Joachim
Behavior
Development
Morphology
Neural Coordination
Cell Biology
ddc:590
Rollenhagen A, Bischof H-J. Phase specific morphological changes induced by social experience in two forebrain areas of the zebra finch. <em>Behavioural Brain Research</em>. 1994;65(1):83-88.
We examined the changes of spine density in Golgi preparations of two different areas of the forebrain of the zebra finch, the ANC (Archi-Neostriatum caudale) and MNH (medial Neo-Hyperstriatum) during development, after transferring male birds from isolation to a social condition (exposure to a female for 1 week), and after a second isolation period. MNH and ANC are two of four brain regions which are strongly activated if a male bird is exposed to a female after some time of isolation. The results of our study can be summarized as follows. 1: a peak-decline trend is observed in ANC, but not in MNH. 2: rearing conditions do not affect the development of both areas until day 70. 3: from 80 days of age, isolation leads to reduced spine density within ANC, but to enhanced spine density within MNH. 4: short social contact after isolation diminishes or eliminates the effects of isolation by an enhancement of spine density in ANC and a reduction of spine density within MNH. 5: the effects of short social rearing after isolation are reversible within ANC, but not within MNH. We presume that the alterations of spine density, which are induced by changes in social conditions, are restricted to ages older than 70 days by hormonal factors. We propose that the complexity of the ANC neuronal net follows the complexity of the social environment, and that the level of arousal is the most important factor influencing the complexity. We further suppose that the reduction of spines within MNH is the anatomical manifestation of an imprinting process, which has been shown to occur in the same experimental situation as we used it in our study.
Elsevier BV
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739956
https://pub.uni-bielefeld.de/record/1773995
https://pub.uni-bielefeld.de/download/1773995/2311358
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0166-4328(94)90076-0
info:eu-repo/semantics/altIdentifier/issn/0166-4328
info:eu-repo/semantics/altIdentifier/wos/A1994PT65000008
info:eu-repo/semantics/altIdentifier/pmid/7880458
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1773998
2018-07-24T12:58:58Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Stabilization of sexual preferences by sexual experience in male zebra finches, taeniopygia guttata castanotis
Bischof, Hans-Joachim
Clayton, Nicky
Ecology
Behavior
Reproduction
ddc:590
Bischof H-J, Clayton N. Stabilization of sexual preferences by sexual experience in male zebra finches, taeniopygia guttata castanotis. <em>Behaviour</em>. 1991;118(1):144-154.
Male zebra finches, Taeniopygia guttala castanotis, were normally-raised by zebra finches or were cross-fostered to Bengalese finch, Lonchura striata, foster-parents until 40 days of age. Following isolation until day 100, half the birds in each group were housed with a zebra finch female for seven days, isolated for three days and then housed with a Bengalese finch female for seven days. The other birds were exposed to females in the reverse order. Subsequent double-choice tests showed that all the normally-raised birds preferred zebra finch females whereas the preference of cross-fostered males depended on the order of exposure to the two females: those exposed first to a Bengalese finch female preferred Bengalese finch females whereas of those exposed first to a zebra finch female, some preferred zebra finches, some preferred Bengalese finches and some showed no marked preference for either female. In order to examine the question of why the latter group showed such markd individual variation in their sexual preferences, a further group of males were cross-fostered to Bengalese finches and exposed to a zebra finch female and then to a Bengalese finch female and their behaviors were observed from day 21 until day 40 and for the two, seven-day periods with the females. The results showed that, when comparing brothers within clutches, the one that begs and is fed more by its foster-parents develops a stronger preference for Benglese finch females and that the more song phrases a male directs to the zebra finch female during the first seven-day period, the stronger the sexual preference for zebra finch females in the double-choice tests. Hence, our results confirm and extend those of IMMELMANN et al. (1991) and KRUIJT and MEEUWISSEN (1991) that sexual imprinting may be a two step process. As a first step, information about the parents is learned during a sensitive period early in life. In a second step, this information has to be tested for its validity for the selection of a sexual partner during first courtship encounters. It is the second step where the previously stored information is stabilized in memory. Giving conflicting information during the first and the second step, one can show that interactions between the young male and its parents as well as with the first sexual partner influence the final preference it shows in subsequent double choice tests.
Brill
1991
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17739982
https://pub.uni-bielefeld.de/record/1773998
https://pub.uni-bielefeld.de/download/1773998/2311359
eng
info:eu-repo/semantics/altIdentifier/doi/10.1163/156853991X00256
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/altIdentifier/issn/1568-539X
info:eu-repo/semantics/altIdentifier/wos/A1991GG09500010
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774001
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Influence of adult courtship experience on the development of sexual preferences in zebra finch males
Immelmann, Klaus
Pröve, Ragna
Lassek, Reinhard
Bischof, Hans-Joachim
Communication
Behavior
Development
Ecology
Reproduction
ddc:590
Immelmann K, Pröve R, Lassek R, Bischof H-J. Influence of adult courtship experience on the development of sexual preferences in zebra finch males. <em>Animal Behaviour</em>. 1991;42(1):83-89.
Young zebra finch, Taeniopygia guttata castanotis, males were raised by Bengalese finch, Lonchura striata, foster parents until day 35, 40 or 50 of age, respectively. Following isolation until day 100, about half of the birds in each age group were tested for their preference for Bengalese or zebra finch females in two double-choice tests (pretests). After breeding experience with a conspecific female for 7 months, their sexual preferences were re-tested in two series of five double-choice tests (post-tests), one series 14 days after breeding experience, the other 7-12 months later. Preferences established during early development were changed by breeding experience. However, this change in preference was suppressed by preceding short phases of courtship experience with the foster parent species (during the pretests) after isolation. The same results were obtained by double-choice tests on the same birds 7-12 months later, demonstrating that the acquired preferences are quite stable. Large individual differences in the preferences of the birds may be caused by as yet unknown, subtle differences in rearing conditions. It is proposed that the preferences acquired during early development have to be stabilized by courtship experience. If the adequate object for courting is replaced by another one, a new preference may emerge. The extremely short time which is needed for consolidation may be explained by the high arousal level during pretests.
Elsevier BV
1991
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740017
https://pub.uni-bielefeld.de/record/1774001
https://pub.uni-bielefeld.de/download/1774001/2311360
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0003-3472(05)80608-6
info:eu-repo/semantics/altIdentifier/issn/0003-3472
info:eu-repo/semantics/altIdentifier/wos/A1991FY40500009
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774006
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Contralateral projections of the optic tectum in the zebra finch (Taeniopygia guttata castanotis)
Bischof, Hans-Joachim
Niemann, Jutta
Sensory Reception
Ecology
Cell Biology
Morphology
Neural Coordination
ddc:590
Bischof H-J, Niemann J. Contralateral projections of the optic tectum in the zebra finch (Taeniopygia guttata castanotis). <em>Cell and Tissue Research</em>. 1990;262(2):307-313.
Efferent projections of the optic tectum of zebra finches were investigated by injection of the radioactive anterograde tracer 3H-proline. In addition to a variety of ipsilateral projections, some contralateral connections were found. Quantitative evaluation of the recrossing tecto-rotundal and nucleus subpraetactalis/nucleus interstitio-praetecto-subpraetactalis projection revealed that these connections are much stronger than previously believed. In contrast, the tecto-tectal projection is very weak, as has been shown previously. Further support for this comes from results obtained using injections of retrograde tracers. The role of the different projections in conveying information from the ipsilateral eye to the ectostriatum, the telencephalic end-station of the tectofugal pathway, is discussed.
Springer Science and Business Media LLC
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740064
https://pub.uni-bielefeld.de/record/1774006
https://pub.uni-bielefeld.de/download/1774006/2311361
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00309886
info:eu-repo/semantics/altIdentifier/issn/0302-766X
info:eu-repo/semantics/altIdentifier/issn/1432-0878
info:eu-repo/semantics/altIdentifier/wos/A1990EF00800012
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774009
2018-07-24T12:58:58Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Ipsilaterally evoked responses of the zebra finch visual wulst are reduced during ontogeny
Bredenkötter, Manfred
Bischof, Hans-Joachim
Development
Behavior
Neural Coordination
Sensory Reception
ddc:590
Bredenkötter M, Bischof H-J. Ipsilaterally evoked responses of the zebra finch visual wulst are reduced during ontogeny. <em>Brain Research</em>. 1990;515(1-2):343-346.
Visual wulst responses to ipsi- and contralateral visual stimuli were investigated in young zebra finches (Taeniopygia guttata castanotis Gould) of different ages. Contralateral responses in 20, 40, 60 and 80 day old birds do not differ significantly from those in adults. In contrast, ipsilateral responses decrease substantially during development and become very weak and irregular in adult birds.
Elsevier BV
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740095
https://pub.uni-bielefeld.de/record/1774009
https://pub.uni-bielefeld.de/download/1774009/2311362
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(90)90620-Q
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1990DH04500052
info:eu-repo/semantics/altIdentifier/pmid/2357573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774012
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Neurophysiological and behavioral development in birds: song learning as a model system
Clayton, Nicky
Bischof, Hans-Joachim
Behavior
Development
Communication
Ecology
Neural Coordination
ddc:590
Clayton N, Bischof H-J. Neurophysiological and behavioral development in birds: song learning as a model system. <em>Naturwissenschaften</em>. 1990;77(3):123-127.
Springer Science and Business Media LLC
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740120
https://pub.uni-bielefeld.de/record/1774012
https://pub.uni-bielefeld.de/download/1774012/2311363
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01134472
info:eu-repo/semantics/altIdentifier/issn/0028-1042
info:eu-repo/semantics/altIdentifier/issn/1432-1904
info:eu-repo/semantics/altIdentifier/wos/A1990CW07400006
info:eu-repo/semantics/altIdentifier/pmid/2188144
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774015
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Flash evoked potentials in the ectostriatum of the zebra finch: a current source density analysis
Engelage, Jürgen
Bischof, Hans-Joachim
Sensory Reception
Neural Coordination
ddc:590
Engelage J, Bischof H-J. Flash evoked potentials in the ectostriatum of the zebra finch: a current source density analysis. <em>Experimental Brain Research</em>. 1989;74(3):563-572.
Recent research has demonstrated that ipsilaterally visually evoked potentials (VEPs) can be measured within the ectostriatum, the telencephalic target area of the tectofugal visual pathway in birds. In this paper we systematically measured contra- and ipsilateral VEPs within the ectostriatal complex to obtain more detailed information on the processing of contra- and ipsilateral stimuli. The similarity of neighbouring VEPs at equal depth and a comparison of a one dimensional and a three dimensional analysis of current source-densities (CSDs) for identical coordinates suggested that a one dimensional current source-density analysis might be applicable. The one dimensional current source-density analysis demonstrated largely corresponding patterns in the sink-source sequences of the current source-density depth profiles for the contra- and ipsilateral stimulus responses. The occurence of a large sink in the centre of the ectostriatal core, together with the results of multiunit recordings, shows that the ectostriatal core is the location of the generators for both the contra- and the ipsilaterally evoked responses. The occurrence of macroscopic sinks and sources and the fact that VEPs can be recorded from the ectostriatum shows that there is a higher degree of order in the ectostriatum than has been previously demonstrated by anatomical methods. The time coincidence between the maximum spike rate of multiunit responses, the negative peak of the evoked potential, and the large central sink demonstrates that the influence of ipsi- as well as of contralateral stimuli is predominantly excitatory.
Springer Science and Business Media LLC
1989
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740151
https://pub.uni-bielefeld.de/record/1774015
https://pub.uni-bielefeld.de/download/1774015/2311364
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00247358
info:eu-repo/semantics/altIdentifier/issn/0014-4819
info:eu-repo/semantics/altIdentifier/issn/1432-1106
info:eu-repo/semantics/altIdentifier/wos/A1989T433300013
info:eu-repo/semantics/altIdentifier/pmid/2707331
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774018
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The visual field and visually guided behavior in the zebra finch (Taeniopygia guttata)
Bischof, Hans-Joachim
Behavior
Sensory reception
ddc:590
Bischof H-J. The visual field and visually guided behavior in the zebra finch (Taeniopygia guttata). <em>Journal of Comparative Physiology, A: Sensory Neural and Behavioral Physiology</em>. 1988;163(3):329-337.
Measurements were made of the physical properties of the visual system of the zebra finch, a bird with laterally placed eyes. The use of the visual system in pecking and courtship behavior was examined. It was demonstrated that the optical axis and the fovea of the eye point in a direction about 62.degree. from the sagittal axis of the head. The visual field of each eye covers about 170.degree. in the horizontal plane. In the frontal region there is an overlap of about 30.degree.-40.degree. where the birds can see binocularly; caudally there is a 'gap' in the visual field of 60.degree.. The point of best binocular viewing is in the sagittal plane at 16.5.degree. below the beak. Concerning movement detection, the upper threshold is 540.degree./s for the binocular (frontal) part of the visual field and about 1100.degree./s for the monocular (lateral) part. Most fixations before pecking occur monocularly. A preference for one eye during pecking was not detected. During the courtship song, a male bird directs its head towards the female. The results are discussed in comparison with findings in pigeons and chickens.
Springer Science and Business Media LLC
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740182
https://pub.uni-bielefeld.de/record/1774018
https://pub.uni-bielefeld.de/download/1774018/2311365
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00604008
info:eu-repo/semantics/altIdentifier/issn/0340-7594
info:eu-repo/semantics/altIdentifier/issn/1432-1351
info:eu-repo/semantics/altIdentifier/wos/A1988P151000004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774020
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Isolation-dependent enhancement of 14C-2-deoxyglucose uptake in the forebrain of zebra finch males
Bischof, Hans-Joachim
Herrmann, Kathrin
Reproduction
Behavior
Metabolism
Neural coordination
ddc:590
Bischof H-J, Herrmann K. Isolation-dependent enhancement of 14C-2-deoxyglucose uptake in the forebrain of zebra finch males. <em>Behavioral and Neural Biology</em>. 1988;49(3):386-397.
In a previous study (H. J. Bischof and K. Herrmann (1986), Behavioral Brain Research, 21, 215-221) we demonstrated that four forebrain areas of the zebra finch male are activated in situations which arouse the animal, for example when the birds are chased around the cage or when they are exposed to a female. These areas, the hyperstriatum accessorium-dorsale (HAD), a part of the medial neo-hyperstriatum (MNH), the lateral neo-hyperstriatum (LNH), and a portion of the caudal archi-neostriatum (ANC), show enhanced 2-[14C]deoxyglucose (2-DG) uptake according to the experimental situation. On the basis of these experiments, we examined whether the activation of the areas is correlated with motor activity and is influenced by different isolation times prior to a 2-DG experiment, where courtship of the male birds is elicited by exposing them to a female zebra finch. For this purpose, we isolated male zebra finches for 1 day, 1 week, or 8 weeks, respectively, before we injected the 2-DG and exposed the birds to a female. During the experiment, besides other activities, the number of song motifs performed by the bird and the frequency of changing perches was recorded. Our experiments demonstrate that there is a weak negative correlation between motor activity and 2-DG uptake, and a positive correlation between isolation time and 2-DG uptake. We suggest that long isolation blocks courtship behavior by some unknown mechanisms, and that the "internal drive" of the animal, which possibly corresponds with the activity of the four forebrain areas, is enhanced by isolation and by the fact that the birds do not perform the consummatory behavior. Our results also demonstrate that the 2-DG method can show up small differences in the internal state of an animal, which cannot easily be detected by behavioral measurements.
Elsevier BV
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740206
https://pub.uni-bielefeld.de/record/1774020
https://pub.uni-bielefeld.de/download/1774020/2311366
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0163-1047(88)90402-5
info:eu-repo/semantics/altIdentifier/issn/0163-1047
info:eu-repo/semantics/altIdentifier/wos/A1988N338700012
info:eu-repo/semantics/altIdentifier/pmid/3408448
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774023
2018-07-24T12:58:58Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Enucleation enhances ipsilateral flash evoked responses in the ectostriatum of the zebra finch (Taeniopygia guttata castanotis Gould)
Engelage, Jürgen
Bischof, Hans-Joachim
Ectrostriatum
Ipsilateral stimulus responses
Zebra finch
Visually evoked potentials
ddc:590
Engelage J, Bischof H-J. Enucleation enhances ipsilateral flash evoked responses in the ectostriatum of the zebra finch (Taeniopygia guttata castanotis Gould). <em>Experimental Brain Research</em>. 1988;70(1):79-89.
The tectofugal pathway in birds has been reported to process primarily information from the contralateral eye. Although this pathway has access to the contralateral hemisphere by various connections, electrophysiological recordings up to now have failed to demonstrate any excitatory influence of visual stimulation in the higher stations of this pathway. This study is the first to demonstrate an excitatory projection from the ipsilateral eye to the telencephalic projection area of the tectofugal pathway by recordings of visually evoked potentials in the ectostriatum. The excitatory projection probably leads from the eye to the contralateral tectum opticum, then recrosses back to the nucleus rotundus of the ipsilateral side where it reaches the ectostriatum. In normal birds, the ipsilateral stimulus responses in the ectostriatum are smaller in amplitude and have a longer latency than responses to contralateral stimuli. In unilaterally enucleated birds, the ipsilateral response is enhanced in the ectostriatum and can be detected in the nucleus rotundus, too. The results suggest that in normal birds the ipsilateral response is inhibited to a high degree by spontaneous activity of the contralateral eye. Possibly, this counterbalanced inhibition provides a mechanism for weighting information from the left and right eye field in order to ensure adequate processing of stimuli.
Springer-Verlag
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740236
https://pub.uni-bielefeld.de/record/1774023
https://pub.uni-bielefeld.de/download/1774023/2311367
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00271850
info:eu-repo/semantics/altIdentifier/issn/1568-5888
info:eu-repo/semantics/altIdentifier/wos/A1988M713800010
info:eu-repo/semantics/altIdentifier/pmid/3402570
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774026
2018-07-24T12:59:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The sensitive period for the morphological effects of monocular deprivation in two nuclei of the tectofugal pathway of zebra finches
Herrmann, Kathrin
Bischof, Hans-Joachim
Neuron size
Bird
Plasticity
Deprivation
Visual system
ddc:590
Herrmann K, Bischof H-J. The sensitive period for the morphological effects of monocular deprivation in two nuclei of the tectofugal pathway of zebra finches. <em>Brain Research</em>. 1988;451(1-2):43-53.
Previous experiments with 2-deoxyglucose (2-DG) suggested the existence of a critical previous termperiodnext term for the effects of monocular deprivation in the nucleus rotundus of zebra finches. The present study concerns the time course of this sensitive period for the morphological effects of monocular deprivation in two areas of the tectofugal visual pathway of zebra finches, the nucleus rotundus of the thalamus and the telencephalic ectostriatum. Cell size and volume changes were measured in birds subjected to 40 days of unilateral eye closure starting at ages spaced regularly throughout the first 70 days of life. The results show that monocular deprivation markedly affects cell size in both areas if the treatment starts at one or 10 days posthatch. The differences between deprived and non-deprived neurons decline monotonically with increasing visual experience prior to deprivation. However, deprivation onset at day 40 again causes as severe effects as early monocular closure. Deprivation as from day 50 or later no longer leads to abnormalities. The measurements of the volume of the nucleus rotundus parallel the cell size measurements, with the exception that the second increase in sensitivity occurs with deprivation onset at day 50 instead of day 40. These data indicate that the time course of the sensitive period for the effects of monocular deprivation may be double-peaked: the sensitivity for external stimuli declines from hatch until day 30, but has another peak at 40–50 days of life. The definite end of the sensitive period, as determined with this method, can therefore be assumed to be at around day 50–60.
Elsevier BV
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740266
https://pub.uni-bielefeld.de/record/1774026
https://pub.uni-bielefeld.de/download/1774026/2311368
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(88)90747-0
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1988N876900004
info:eu-repo/semantics/altIdentifier/pmid/3251603
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774029
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Development of neurons in the ectostriatum of normal and monocularly deprived zebra finches: a quantitative Golgi study
Herrmann, Kathrin
Bischof, Hans-Joachim
Spines
Birds
Overshoot
Ontogeny
Visual deprivation
ddc:590
Herrmann K, Bischof H-J. Development of neurons in the ectostriatum of normal and monocularly deprived zebra finches: a quantitative Golgi study. <em>The Journal of Comparative Neurology</em>. 1988;277(1):141-154.
The postnatal development of the main neuron type in the ectostriatum, the telencephalic station of the tectofugal pathway, was followed in normally reared and monocularly deprived zebra finches by using the Golgi method. Three parameters were investigated: dendritic field radius, branching index, and spine density. The results show that all three exhibit the same developmental trend - namely, an increase from day 5 until day 20, followed by a subsequent reduction until adulthood (>100 days). Monocular deprivation from birth until day 20, 40, or at least 100 does not seem to interfere with the development of the dendritic field radius or branching index. Clear changes in spine density result from depriving the birds for at least 40 days. In these birds, neurons in the deprived hemisphere bear significantly fewer spines than those in the nondeprived hemisphere, which is mainly due to a lack of normally occurring spine reduction in the nondeprived hemisphere rather than to spine reduction in the deprived hemisphere.
Wiley
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740299
https://pub.uni-bielefeld.de/record/1774029
https://pub.uni-bielefeld.de/download/1774029/2311369
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/cne.902770110
info:eu-repo/semantics/altIdentifier/issn/0021-9967
info:eu-repo/semantics/altIdentifier/issn/1096-9861
info:eu-repo/semantics/altIdentifier/wos/A1988Q803700009
info:eu-repo/semantics/altIdentifier/pmid/2461970
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774032
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Topographic relations between ocular dominance and orientation columns in the cat striate cortex
Löwel, Siegrid
Bischof, Hans-Joachim
Leutenecker, B.
Singer, W.
Ocular dominance
Visual cortex
Orientation
Columns
ddc:590
Löwel S, Bischof H-J, Leutenecker B, Singer W. Topographic relations between ocular dominance and orientation columns in the cat striate cortex. <em>Experimental Brain Research</em>. 1988;71(1):33-46.
In the visual cortex of four adult cats ocular dominance and orientation columns were visualized with (3H)proline and (14C)deoxyglucose autoradiography. The two columnar systems were reconstructed from serial horizontal sections or from flat-mount preparations and graphically superimposed. They share a number of characteristic features: In both systems the columns have a tendency to form regularly spaced parallel bands whose main trajectory is perpendicular to the border between areas 17 and 18. These bands frequently bifurcate or terminate in blind endings. The resulting irregularities are much more pronounced in the ocular dominance than in the orientation system. The periodicity of the columnar patterns was assessed along trajectories perpendicular to the main orientation of the bands and differed in the two columnar systems. The spacing of the ocular dominance stripes was significantly narrower than the spacing of orientation bands. The mean periodicity of a particular columnar system was virtually identical in the two hemispheres of the same animal but it differed substantially in different animals. However, the spacing of orientation columns covaried with that of the ocular dominance columns, the ratios of the mean spacings of the two columnar systems being similar in the four cats. The superposition of the two columnar systems revealed no obvious topographic relation between any of the organizational details such as the location of bifurcations, blind endings and intersections. We suggest the following conclusions: 1. The developmental processes generating the two columnar systems seem to obey the same algorithms but they act independently of each other. 2. The space constants of the two systems are rigorously specified and appear to depend on a common variable. 3. The main orientation of the bands in both columnar systems is related to a) the representation of the vertical meridian, b) the anisotropy of the cortical magnification factor, and c) the tangential spread of intracortical connections.
Springer Science and Business Media LLC
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740328
https://pub.uni-bielefeld.de/record/1774032
https://pub.uni-bielefeld.de/download/1774032/2311370
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00247520
info:eu-repo/semantics/altIdentifier/issn/0014-4819
info:eu-repo/semantics/altIdentifier/issn/1432-1106
info:eu-repo/semantics/altIdentifier/wos/A1988N933900004
info:eu-repo/semantics/altIdentifier/pmid/3416956
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774037
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Ultrastructural effects of monocular deprivation in the neuropil of nucleus rotundus in the zebra finch: a quantitative electron microscopic study
Nixdorf, Barbara
Bischof, Hans-Joachim
Synapse
Visual system
Quantitative analysis
Bird
Monocular deprivation
ddc:590
Nixdorf B, Bischof H-J. Ultrastructural effects of monocular deprivation in the neuropil of nucleus rotundus in the zebra finch: a quantitative electron microscopic study. <em>Brain Research</em>. 1987;405(2):326-336.
Ultrastructural effects of monocular deprivation starting at hatching have been studied in the neuropil of nucleus rotundus, the thalamic visual relay station of the tectofugal pathway in birds. Synaptic density, presynaptic terminal size, and length of postsynaptic density (PSD) have been quantified in juvenile (20-day) and adult (100-day) zebra finches. These parameters are mature in 20-day-old zebra finches when reared under normal conditions. Alterations obtained by monocular deprivation were: (1) The synaptic density increases by 35% in the nucleus rotundus of both sides of the brain above normal values in juvenile birds. In adult birds only the deprived side maintains this hypertrophy of synaptic density (33%), the non-deprived side returns to normal values. (2) The presynaptic terminal size remains small in the deprived nucleus of 20-day- and 100-day-old animals, whereas the non-deprived nucleus is not affected. (3) By the age of 20 days the length of PSD in deprived and non-deprived nuclei is not reduced as much as in normally reared zebra finches. By the age of 100 days, however, the PSDs of both sides of monocularly deprived birds show a further reduction of their median length and do not differ from PSDs of zebra finches reared under normal conditions.
Elsevier BV
1987
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740379
https://pub.uni-bielefeld.de/record/1774037
https://pub.uni-bielefeld.de/download/1774037/2311371
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(87)90302-7
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1987G444800014
info:eu-repo/semantics/altIdentifier/pmid/3567611
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774040
2018-07-24T12:59:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Arousal enhances [14C]2-deoxyglucose uptake in four forebrain areas of the zebra finch
Bischof, Hans-Joachim
Herrmann, Kathrin
Arousal
Zebra finch
Forebrain
ddc:590
Bischof H-J, Herrmann K. Arousal enhances [14C]2-deoxyglucose uptake in four forebrain areas of the zebra finch. <em>Behavioural Brain Research</em>. 1986;21(3):215-221.
The activity pattern of the forebrain of male zebra finches was investigated by the [14C]2-deoxyglucose (2-DG) method in 4 different behavioral situations. (1) Sitting alone in the cage (control); (2) courtship by experienced birds; (3) first courtship of inexperienced birds (100 days of age), and (4) chasing the birds around the cage. The primary sensory areas (ectostriatum, field L) were active above background in each experiment. Vocal-motor control areas were at background activity (RA, HVc, MAN), or below background (area X), all unaffected by the type of experiment. In contrast, 4 different areas were active in Expts. 3 and 4, but not in 1 and 2: (a) part of the neostriatum intermedium; (b) part of the lateral neostriatum, both with adjacent parts of the hyperstriatum ventrale, (c) hyperstriatum accessorium and hyperstriatum dorsale, (d) a portion of the caudal neo/archistriatum. It is concluded that the enhanced activity of these areas is not due to distinct external stimulation or enhanced motor activity, but correlates with high arousal levels of the animals.
Elsevier BV
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740400
https://pub.uni-bielefeld.de/record/1774040
https://pub.uni-bielefeld.de/download/1774040/2311372
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0166-4328(86)90239-1
info:eu-repo/semantics/altIdentifier/issn/0166-4328
info:eu-repo/semantics/altIdentifier/wos/A1986E150600006
info:eu-repo/semantics/altIdentifier/pmid/3768137
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774043
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Delayed development of song control nuclei in the zebra finch is related to behavioral development
Herrmann, Kathrin
Bischof, Hans-Joachim
Behavior
Visual system
Ontogeny
Song control system
ddc:590
Herrmann K, Bischof H-J. Delayed development of song control nuclei in the zebra finch is related to behavioral development. <em>The Journal of Comparative Neurology</em>. 1986;245(2):167-175.
The postnatal development of two visual areas (nucleus rotundus and ectostriatum) and two song control areas (hyperstriatum ventrale pars caudale, HVc, and nucleus robustus archistriatalis, RA) of the zebra finch brain was followed from birth to adulthood. The following parameters were investigated: (1) neuron size, (2) volume of the brain nuclei, and (3) myelination of axons. The nucleus rotundus, the diencephalic station of the tectofugal pathway, exhibits the fastest development: rotundal neurons reach their maximum size at 20 days of age; the volume of this structure reaches adult size at the same time. The process of myelination begins between day 5 and day 10 and is completed at 40 days of age. A similar temporal sequence of development is seen in the ectostriatum, except myelination starts some days later. Thus the development of these visual areas is completed at 40 days. In, contrast, the development of the song control nuclei is delayed. Neurons in RA and HVc grow steadily up to 40 days of age, attaining a size larger than that observed in adults. Whereas the volume of HVc increases until day 40 and remains stable thereafter, RA volume increases until day 70 and evidences a decrease thereafter. It is not until postnatal day 20 (RA) and day 40 (HVc) that the myelination process starts in the song control areas. Adult myelin density is achieved by 70 days in RA and by 100 days in HVc. It can be demonstrated that the development of the visual system parallels the development of visual performance of the birds. Delayed growth of song control nuclei coincides with development of song.
Wiley
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740437
https://pub.uni-bielefeld.de/record/1774043
https://pub.uni-bielefeld.de/download/1774043/2311373
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/cne.902450204
info:eu-repo/semantics/altIdentifier/issn/0021-9967
info:eu-repo/semantics/altIdentifier/issn/1096-9861
info:eu-repo/semantics/altIdentifier/wos/A1986A456600003
info:eu-repo/semantics/altIdentifier/pmid/3958245
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774046
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Monocular deprivation affects neuron size in the ectostriatum of the zebra finch brain
Herrmann, Kathrin
Bischof, Hans-Joachim
Plasticity
Ectostriatum
Monocular deprivation
Cell size
Tectofugal visual system
ddc:590
Herrmann K, Bischof H-J. Monocular deprivation affects neuron size in the ectostriatum of the zebra finch brain. <em>Brain Research</em>. 1986;379(1):143-146.
The effects of different periods of monocular deprivation on cell sizes in the ectostriatum, the telencephalic relay of the tectofugal pathway in zebra finches, were evaluated. Following 20 days of monocular closure, neurons in the deprived and undeprived hemisphere show an unselective hypertrophy of 10%. Extending the deprivation period results in a shrinkage of neurons of the deprived side to values of adult normally reared birds, whereas the non-deprived neurons maintain their hypertrophied size.
Elsevier BV
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740468
https://pub.uni-bielefeld.de/record/1774046
https://pub.uni-bielefeld.de/download/1774046/2311374
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(86)90266-0
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1986D459000018
info:eu-repo/semantics/altIdentifier/pmid/3742208
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774049
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effects of monocular deprivation in the nucleus rotundus of zebra finches: a Nissl and deoxyglucose study
Herrmann, Kathrin
Bischof, Hans-Joachim
Neuron size
Birds
Visual system
Monocular deprivation
ddc:590
Herrmann K, Bischof H-J. Effects of monocular deprivation in the nucleus rotundus of zebra finches: a Nissl and deoxyglucose study. <em>Experimental Brain Research</em>. 1986;64(1):119-126.
We evaluated in zebra finches the effects of monocular deprivation on morphological and physiological features of the nucleus rotundus, the thalamic relay station of the tectofugal pathway. In a first series of experiments neuron size and total volume were estimated in animals deprived for 20, 40 and at least 100 days and compared to values obtained from normally reared birds. Monocular closure for more than 40 days causes a marked hypertrophy in cells receiving their main input from the open eye, whereas the deprived cells are normal in size. However, with only 20 days of monocular deprivation both deprived and non-deprived rotundal neurons are larger than normal. This indicates that monocular closure has a biphasic effect: firstly, an unselective hypertrophy of deprived and non-deprived neurons, and secondly, a subsequent period of shrinkage of the deprived cells to normal values, while cells driven by the open eye remain hypertrophied. The total volume of the deprived n. rotundus turns out to be smaller in all age groups. In a second series of experiments the activity of the n. rotundus of animals monocularly deprived from birth for 100 days was investigated with the 2-deoxyglucose-method (Sokoloff et al. 1977). With binocular stimulation the activity of the deprived n. rotundus was reduced by about 40%. Depriving adult animals for 100 days does not result in asymmetric labeling of the n. rotundus. We interpretate the 2-DG data as evidence for the existence of a sensitive period for the effects of monocular deprivation. The anatomical data suggest, however, that the effects of monocular deprivation in birds are different from those observed in mammals.
Springer Science and Business Media LLC
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740493
https://pub.uni-bielefeld.de/record/1774049
https://pub.uni-bielefeld.de/download/1774049/2311375
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00238207
info:eu-repo/semantics/altIdentifier/issn/0014-4819
info:eu-repo/semantics/altIdentifier/issn/1432-1106
info:eu-repo/semantics/altIdentifier/wos/A1986E251600013
info:eu-repo/semantics/altIdentifier/pmid/3770105
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774052
2018-07-24T12:59:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Posthatching development of synapses in the neuropil of nucleus rotundus of the zebra finch: a quantitative electron microscopic study
Nixdorf, Barbara
Bischof, Hans-Joachim
Quantitative analysis
Birds
Posthatching development
Visual system
ddc:590
Nixdorf B, Bischof H-J. Posthatching development of synapses in the neuropil of nucleus rotundus of the zebra finch: a quantitative electron microscopic study. <em>The Journal of Comparative Neurology</em>. 1986;250(1):133-139.
The development and maturation of synapses in the nucleus rotundus of the zebra finch were examined at 1, 5, 10, 20, and 100 days posthatching. Quantitative ultrastructural techniques were applied to investigate synaptic density, size of presynaptic terminals, and length of postsynaptic thickenings. During development there is a steady increase in the number of synapses and an enlargement of the presynaptic terminals. The length of the postsynaptic thickenings, however, decreases significantly during posthatching development. All three parameters reach adult values within 20 days of age. A close relationship was found between the enlargement of the presynaptic terminals and the increase in the number of contact zones up Lv the 20th day. The general feature of this developmental progress is in good agreement with biochemical and, to a certain extent, behavioral studies.
Wiley
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740526
https://pub.uni-bielefeld.de/record/1774052
https://pub.uni-bielefeld.de/download/1774052/2311376
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/cne.902500111
info:eu-repo/semantics/altIdentifier/issn/0021-9967
info:eu-repo/semantics/altIdentifier/issn/1096-9861
info:eu-repo/semantics/altIdentifier/wos/A1986D271100010
info:eu-repo/semantics/altIdentifier/pmid/3734166
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774055
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Der Anteil akustischer Komponenten an der Auslösung der Balz männlicher Zebrafinken (Taeniopygia guttata castanotis)
Bischof, Hans-Joachim
ddc:590
Bischof H-J. Der Anteil akustischer Komponenten an der Auslösung der Balz männlicher Zebrafinken (Taeniopygia guttata castanotis). <em>Journal of Ornithology</em>. 1985;126(3):273-279.
Courtship behaviour of male zebra finches is elicited by the presence of stuffed dummies, but not by acoustic contact with a female. Acoustic contact, however, enhances the arousal of the male and leads to a higher frequency of courtship behaviour if compared with experiments, where solely optic components of the releaser female are offered.
Springer Science and Business Media LLC
1985
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740559
https://pub.uni-bielefeld.de/record/1774055
https://pub.uni-bielefeld.de/download/1774055/2311377
deu
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01640369
info:eu-repo/semantics/altIdentifier/issn/0021-8375
info:eu-repo/semantics/altIdentifier/issn/1439-0361
info:eu-repo/semantics/altIdentifier/wos/A1985AQJ0400004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774057
2018-07-24T12:59:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Flash evoked responses in a song control nucleus of the zebra finch (Taeniopygia guttata castanotis)
Bischof, Hans-Joachim
Engelage, Jürgen
Visually evoked potentials
Hyperstriatum ventrale pars caudale
Zebra finch
ddc:590
Bischof H-J, Engelage J. Flash evoked responses in a song control nucleus of the zebra finch (Taeniopygia guttata castanotis). <em>Brain Research</em>. 1985;326(2):370-374.
The song of the zebra finch is facilitated and altered by the presence of a female. Thus, visual information should affect the song system of the bird. Visually evoked potentials can be recorded from n. hyperstriatum ventrale pars caudale (HVc). The long latency of this potential and its variability indicate several processing steps between primary sensory areas of the telencephalon and HVC. Within HVc, under these experimental conditions no interaction between acoustic and visual input could be demonstrated. However, at the dorsal border and within the shelf below HVc, visual information seems to enhance acoustically evoked potentials.
Elsevier BV
1985
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740570
https://pub.uni-bielefeld.de/record/1774057
https://pub.uni-bielefeld.de/download/1774057/2311378
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(85)90048-4
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1985ABY4500020
info:eu-repo/semantics/altIdentifier/pmid/3971162
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774060
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Imprinting and cortical plasticity: A comparative review: a comparative review
Bischof, Hans-Joachim
Plasticity
Early learning
Imprinting
Visual cortex
ddc:590
Bischof H-J. Imprinting and cortical plasticity: A comparative review: a comparative review. <em>Neuroscience and Biobehavioral Reviews</em>. 1983;7(2):213-225.
Results of research on imprinting and developmental neurobiology of the visual cortex are compared to evaluate the evidence for or against a frequently hypothesized linkage of the two phenomena. The comparison reveals striking similarities. In both paradigms a sensitive period exists. Once this sensitive period is over, the storage of early influences from the environment remains stable throughout life. Storage of “natural” stimuli is facilitated by a certain preorganisation of the receiving brain areas. It is stated that the two phenomena are not directly linked, but are two expressions of a developmental process, which may be common for the organisation of the connectivity of single cells as well as for complex neuronal networks as they are likely to be involved in imprinting. This process is basically self-organizing, but can be influenced by superimposed controls. Differences of the stability of storage of external influences might be explained by the difference in the overall amount of morphological alterations, which is large in the young and small in the adult animal. This holds for both the modifiability in the visual cortex and imprinting.
Elsevier BV
1983
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740604
https://pub.uni-bielefeld.de/record/1774060
https://pub.uni-bielefeld.de/download/1774060/2311379
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0149-7634(83)90016-7
info:eu-repo/semantics/altIdentifier/issn/0149-7634
info:eu-repo/semantics/altIdentifier/wos/A1983QR46900004
info:eu-repo/semantics/altIdentifier/pmid/6348606
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774062
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Gravity reception in crickets: the influence of cereal and antennal afferences on the head position
Horn, Eberhard
Bischof, Hans-Joachim
ddc:590
Horn E, Bischof H-J. Gravity reception in crickets: the influence of cereal and antennal afferences on the head position. <em>Journal of Comparative Physiology, A: Neuroethology, Sensory, Neural, and Behavioral Physiology</em>. 1983;150(1):93-98.
In the cricket,Gryllus bimaculatus, compensatory head movements are elicited by cereal and antennal receptors when the animals are rotated around their longitudinal axis. The cereal afferences originate in the club-shaped sensilla, whereas the antennal ones probably arise in receptors measuring displacements of the flagellum at the joint between scapus and pedicellus. The clubshaped cereal sensilla are true gravity receptors different from the proprioceptive gravity receptor systems characteristic of most insects.
Springer Science and Business Media LLC
1983
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740620
https://pub.uni-bielefeld.de/record/1774062
https://pub.uni-bielefeld.de/download/1774062/2311380
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00605292
info:eu-repo/semantics/altIdentifier/issn/0340-7594
info:eu-repo/semantics/altIdentifier/issn/1432-1351
info:eu-repo/semantics/altIdentifier/wos/A1983QH66500010
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774065
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Afferent connections of the ectostriatum and visual wulst in the zebra finch (Taeniopygia guttata castanotis Gould) — an HRP study
Nixdorf, Barbara
Bischof, Hans-Joachim
Tectofugal pathway
Zebra finch
Thalamofugal pathway
Horseradish peroxidase
Tetramethylbenzedine
ddc:590
Nixdorf B, Bischof H-J. Afferent connections of the ectostriatum and visual wulst in the zebra finch (Taeniopygia guttata castanotis Gould) — an HRP study. <em>Brain Research</em>. 1982;248(1):9-17.
Afferent connections of the two main areas in the telencephalon, the visual wulst and the ectostriatum, were traced in the zebra finch by injection of horseradish peroxidase and staining with tetramethylbenzidine (TMB). Nuclei projecting to the hyperstriatum accessorium (HA) or the HIS region (lamina hyperstriatica intercalatus superior) were: (1) ipsilaterally the n. dorsalis anterior pars lateralis (DLL) with its two subdivisions DLLd and DLLv, the n. dorsolateralis anterior pars magnocellularis (DLAmc), and the area pretectalis (AP); (2) bilaterally the nucleus of the septomesencephalic tract (SPC) with the ipsilateral component coming from the medial, the contralateral component from the lateral part of the nucleus. As in the pigeon or the owl the ectostriatum of the zebra finch receives massive input, which is topographically ordered, from the n. rotundus. In addition to this pathway the ectostriatum receives additional visual input from the ipsilateral area pretectalis, the n. subrotundus and eventually a bilateral projection from the n. tegmenti pedunculopontinus pars compacta (TPC).
Elsevier BV
1982
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740656
https://pub.uni-bielefeld.de/record/1774065
https://pub.uni-bielefeld.de/download/1774065/2311381
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0006-8993(82)91142-8
info:eu-repo/semantics/altIdentifier/issn/0006-8993
info:eu-repo/semantics/altIdentifier/wos/A1982PH90300002
info:eu-repo/semantics/altIdentifier/pmid/7127143
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774068
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
A stereotaxic headholder for small birds
Bischof, Hans-Joachim
Birds
Zebra finches
Stereotaxic headholder
ddc:590
Bischof H-J. A stereotaxic headholder for small birds. <em>Brain Research Bulletin</em>. 1981;7(4):435-436.
A Stereotaxic headholder especially designed for small birds is described. The major advantage of the holder is its easy handling when mounting the bird to the apparatus, and better access to the visual field of the bird when compared with other frequently used headholders.
Elsevier BV
1981
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740685
https://pub.uni-bielefeld.de/record/1774068
https://pub.uni-bielefeld.de/download/1774068/2311382
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0361-9230(81)90042-3
info:eu-repo/semantics/altIdentifier/issn/0361-9230
info:eu-repo/semantics/altIdentifier/wos/A1981MN57300016
info:eu-repo/semantics/altIdentifier/pmid/7028213
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774070
2018-07-24T12:59:15Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Reaktionen von Zebrafinkenmännchen auf zweidimensionale Attrappen: Einfluß von Reizqualität und Prägung
Bischof, Hans-Joachim
ddc:590
Bischof H-J. Reaktionen von Zebrafinkenmännchen auf zweidimensionale Attrappen: Einfluß von Reizqualität und Prägung. <em>Journal of Ornithology</em>. 1980;121(3):288-290.
Springer Science and Business Media LLC
1980
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740706
https://pub.uni-bielefeld.de/record/1774070
https://pub.uni-bielefeld.de/download/1774070/2311383
deu
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01647620
info:eu-repo/semantics/altIdentifier/issn/0021-8375
info:eu-repo/semantics/altIdentifier/issn/1439-0361
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774072
2018-07-24T12:58:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Unterscheidung zweidimensionaler Attrappen durch Zebrafinkenmännchen
Bischof, Hans-Joachim
ddc:590
Bischof H-J. Unterscheidung zweidimensionaler Attrappen durch Zebrafinkenmännchen. <em>ournal of Ornithology</em>. 1977;118(4):438-439.
Springer Science and Business Media LLC
1977
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740724
https://pub.uni-bielefeld.de/record/1774072
https://pub.uni-bielefeld.de/download/1774072/2311384
deu
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01643126
info:eu-repo/semantics/altIdentifier/issn/0021-8375
info:eu-repo/semantics/altIdentifier/issn/1439-0361
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1774074
2018-07-24T12:58:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Die keulenförmigen Sensillen auf den Cerci der Grille Gryllus bimaculatus als Schwererezeptoren
Bischof, Hans-Joachim
ddc:590
Bischof H-J. Die keulenförmigen Sensillen auf den Cerci der Grille Gryllus bimaculatus als Schwererezeptoren. <em>Journal of Comparative Physiology, A: Neuroethology, Sensory, Neural, and Behavioral Physiology</em>. 1975;98(3):277-288.
Die Sinneskeulen sind durch eine Sinneszelle innerviert, die phasischtonische Reizantworten zeigt. Die größten Änderungen der Impulsfrequenzen entstehen bei Ablenkung der Keulen in ihrer mechanischen Vorzugsebene. Die kleinste Auslenkung, die noch Impulsfrequenzänderungen hervorruft, beträgt 0,1°. Die Anstiegssteilheit des Reizes verändert die Höhe der phasischen Antwort. Auf Sinusreize antwortet der Rezeptor bis 300 Hz mit reizsynchronen Impulssalven. Gemeinsam mit Impulsen des ableitenden Nerven konnten Impulse der an der Basis der Keulenbecher liegenden campaniformen Sensillen abgeleitet werden. Ihre Erregungsmuster sind phasisch, sie sprechen auf Bewegung des Bechers, nicht aber der Keulen allein an. Keulenförmige Sensillen können prinzipiell die Lage der Grille im Schwerefeld messen. Dies wird indirekt durch die Messung der Ablenkung der Keule im Schwerefeld und die Registrierung der Amplitudenkennlinie, und direkt durch die Ableitung der Nervenimpulse während der Drehung des Tieres im Schwerefeld bewiesen.
Springer Science and Business Media LLC
1975
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17740745
https://pub.uni-bielefeld.de/record/1774074
https://pub.uni-bielefeld.de/download/1774074/2311385
deu
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00656974
info:eu-repo/semantics/altIdentifier/issn/0340-7594
info:eu-repo/semantics/altIdentifier/issn/1432-1351
info:eu-repo/semantics/altIdentifier/wos/A1975AA64500004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1777136
2018-07-24T12:58:29Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
The organization of the tectofugal pathway in birds: a comparative review
Engelage, Jürgen
Bischof, Hans-Joachim
Zeigler, Harris Philip
ddc:590
Engelage J, Bischof H-J. The organization of the tectofugal pathway in birds: a comparative review. In: Zeigler HP, ed. <em>Vision, brain, and behavior in birds</em>. Cambridge, Mass.: MIT Press; 1993: 137-158.
MIT Press
1993
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17771365
https://pub.uni-bielefeld.de/record/1777136
https://pub.uni-bielefeld.de/download/1777136/2312325
eng
info:eu-repo/semantics/altIdentifier/isbn/0-262-24036-X
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1777138
2018-07-24T12:59:37Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Development of the tectofugal visual system of normal and deprived zebra finches
Herrmann, Kathrin
Bischof, Hans-Joachim
Zeigler, Harris Philip
ddc:590
Herrmann K, Bischof H-J. Development of the tectofugal visual system of normal and deprived zebra finches. In: Zeigler HP, ed. <em>Vision, brain, and behavior in birds</em>. Cambridge, Mass.: MIT Press; 1993: 207-226.
MIT Press
1993
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17771389
https://pub.uni-bielefeld.de/record/1777138
https://pub.uni-bielefeld.de/download/1777138/2312326
eng
info:eu-repo/semantics/altIdentifier/isbn/0-262-24036-X
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1777146
2018-07-24T12:58:05Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Visuomotor coordination in flies
Borst, Alexander
Egelhaaf, Martin ; https://orcid.org/0000-0002-9336-4270
Arbib, Michael A.
ddc:590
Borst A, Egelhaaf M. Visuomotor coordination in flies. In: Arbib MA, ed. <em>The handbook of brain theory and neural networks</em>. Cambridge, Mass.: MIT Press; 1995: 1031-1036.
MIT Press
1995
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-14021
https://pub.uni-bielefeld.de/record/1777146
https://pub.uni-bielefeld.de/download/1777146/2312328
eng
info:eu-repo/semantics/altIdentifier/isbn/0-262-01148-4
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1628608
2018-07-24T12:59:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Activity-dependent plasticity in visual forebrain areas of the zebra finch
Rollenhagen, Astrid
Bischof, Hans-Joachim
mammal
2-Deoxyglucose
imprinting
Golgi impregnation
development
learning
visual system
arousal
bird
ddc:590
Rollenhagen A, Bischof H-J. Activity-dependent plasticity in visual forebrain areas of the zebra finch. <em>Behavioural Brain Research</em>. 1996;81(1-2):207-213.
ELSEVIER SCIENCE BV
1996
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-16286086
https://pub.uni-bielefeld.de/record/1628608
https://pub.uni-bielefeld.de/download/1628608/2311140
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0166-4328(96)00052-6
info:eu-repo/semantics/altIdentifier/issn/0166-4328
info:eu-repo/semantics/altIdentifier/wos/A1996VV55100023
info:eu-repo/semantics/altIdentifier/pmid/8950018
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1783262
2018-07-24T12:59:23Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Foraging under uniform risk from different types of predators
Liesenjohann, T.
Eccard, J. A.
ddc:590
Liesenjohann T, Eccard JA. Foraging under uniform risk from different types of predators. <em>BMC Ecology</em>. 2008;8(1): 19.
BACKGROUND: Many animals live in environments where different types of predators pose a permanent threat and call for predator specific strategies. When foraging, animals have to balance the competing needs of food and safety in order to survive. While animals sometimes can choose between microhabitats that differ in their risk of predation, many habitats are uniform in their risk distribution. So far, little is known about adaptive antipredator behavior under uniform risk. We simulated two predator types, avian and mammalian, each representing a spatially uniform risk in the artificial resource landscapes. Voles served as experimental foragers. RESULTS: Animals were exposed to factorial combinations of weasel odour and ground cover to simulate avian and/or mammalian predation. We measured short and long term responses with video analysis and giving-up densities. The results show that previously experienced conditions cause delayed effects. After these effects ceased, the risks of both types of predation caused a reduction in food intake. Avian predation induced a concentration on a smaller number of feeding patches. While higher avian risk caused a delay in activity, the weasel odour shortened the latency until the voles started to be active. CONCLUSION: We show that the voles differed in risk types and adjusted their feeding strategies accordingly. Responses to avian and mammalian risk differed both in strength and time scales. Uniformity of risk resulted in a concentration of foraging investment and lower foraging efficiency.
Springer Science and Business Media LLC
2008
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17832627
https://pub.uni-bielefeld.de/record/1783262
https://pub.uni-bielefeld.de/download/1783262/2314143
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1472-6785-8-19
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/pmid/19068146
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1783739
2018-07-24T12:58:04Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Apparent survival of the salamander Salamandra salamandra is low because of high migratory activity
Schmidt, Benedikt R.
Schaub, Michael
Steinfartz, Sebastian
ddc:590
Schmidt BR, Schaub M, Steinfartz S. Apparent survival of the salamander Salamandra salamandra is low because of high migratory activity. <em>Frontiers in Zoology</em>. 2007;4(1): 19.
Background: Understanding the demographic processes underlying population dynamics is a central theme in ecology. Populations decline if losses from the population (i.e., mortality and emigration) exceed gains (i.e., recruitment and immigration). Amphibians are thought to exhibit little movement even though local populations often fluctuate dramatically and are likely to go exinct if there is no rescue effect through immigration from nearby populations. Terrestrial salamanders are generally portrayed as amphibians with low migratory activity. Our study uses demographic analysis as a key to unravel whether emigration or mortality is the main cause of ''losses'' from the population. In particular, we use the analysis to challenge the common belief that terrestrial salamanders show low migratory activity. Results: The mark-recapture analysis of adult salamanders showed that monthly survival was high (> 90%) without a seasonal pattern. These estimates, however, translate into rather low rates of local annual survival of only ~40% and suggest that emigration was important. The estimated probability of emigration was 49%. Conclusion: Our analysis shows that terrestrial salamanders exhibit more migratory activity than commonly thought. This may be due either because the spatial extent of salamander populations is underestimated or because there is a substantial exchange of individuals between populations. Our current results are in line with several other studies that suggest high migratory activity in amphibians. In particular, many amphibian populations may be characterized by high proportions of transients and/or floaters.
Springer Science and Business Media LLC
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17837397
https://pub.uni-bielefeld.de/record/1783739
https://pub.uni-bielefeld.de/download/1783739/2314256
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-4-19
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000209158400019
info:eu-repo/semantics/altIdentifier/pmid/17803829
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1783746
2018-07-24T12:58:04Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Galápagos and Californian sea lions are separate species: genetic analysis of the genus Zalophus and its implications for conservation management
Wolf, Jochen B. W.
Tautz, Diethard
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Wolf JBW, Tautz D, Trillmich F. Galápagos and Californian sea lions are separate species: genetic analysis of the genus Zalophus and its implications for conservation management. <em>Frontiers in Zoology</em>. 2007;4(1): 20.
Background: Accurate formal taxonomic designations are thought to be of critical importance for the conservation of endangered taxa. The Galápagos sea lion (GSL), being appreciated as a key element of the Galápagos marine ecosystem, has lately been listed as 'vulnerable' by the IUCN. To date there is, however, hardly any scientific evidence, whether it constitutes a separate entity from its abundant Californian neighbour (CSL). In this paper, we delineate the taxonomic relationships within the genus Zalophus being comprised of the Galápagos sea lion, the Californian sea lion and the already extinct Japanese sea lion (JSL). Results: Using a set of different phylogenetic reconstruction approaches, we find support for monophyly of all three taxa without evidence of reticulation events. Molecular clock estimates place time to common ancestry of the Galápagos sea lion and the Californian sea lion at about 2.3 ± 0.5 mya. Genetic separation is further suggested by diagnostic SNPs in the mitochondrial and nuclear genome. Microsatellite markers confirm this trend, showing numerous private alleles at most of the 25 investigated loci. Microsatellite-based estimates of genetic differentiation between the Galápagos sea lion and the Californian sea lion indicate significant genetic differentiation. Gene diversity is 14% lower in the Galápagos sea lion than in the Californian sea lion, but there is no evidence for recent bottleneck events in the Galápagos sea lion. Conclusion: Based on molecular evidence we build a case for classifying the Galápagos sea lion (Zalophus wollebaeki), the Californian sea lion (Zalophus californianus) and the Japanese sea lion (Zalophus japonicus) as true species. As morphological characters do not necessarily fully reflect the rapid divergence on the molecular level, the study can be considered as a test case for deriving species status from molecular evidence. We further use the results to discuss the role of genetics in conservation policy for an organism that already is under the general protection of the habitat it lives in.
Springer Science and Business Media LLC
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17837469
https://pub.uni-bielefeld.de/record/1783746
https://pub.uni-bielefeld.de/download/1783746/2314258
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-4-20
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000209158400020
info:eu-repo/semantics/altIdentifier/pmid/17868473
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1783773
2018-07-24T12:59:12Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Tracing early stages of species differentiation: ecological, morphological and genetic divergence of Galápagos sea lion populations
Wolf, Jochen B. W.
Harrod, Chris
Brunner, Sylvia
Salazar, Sandie
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Tautz, Diethard
ddc:590
Wolf JBW, Harrod C, Brunner S, Salazar S, Trillmich F, Tautz D. Tracing early stages of species differentiation: ecological, morphological and genetic divergence of Galápagos sea lion populations. <em>BMC Evolutionary Biology</em>. 2008;8(1): 150.
Background: Oceans are high gene flow environments that are traditionally believed to hamper the build-up of genetic divergence. Despite this, divergence appears to occur occasionally at surprisingly small scales. The Galápagos archipelago provides an ideal opportunity to examine the evolutionary processes of local divergence in an isolated marine environment. Galápagos sea lions (Zalophus wollebaeki) are top predators in this unique setting and have an essentially unlimited dispersal capacity across the entire species range. In theory, this should oppose any genetic differentiation. Results: We find significant ecological, morphological and genetic divergence between the western colonies and colonies from the central region of the archipelago that are exposed to different ecological conditions. Stable isotope analyses indicate that western animals use different food sources than those from the central area. This is likely due to niche partitioning with the second Galápagos eared seal species, the Galápagos fur seal (Arctocephalus galapagoensis) that exclusively dwells in the west. Stable isotope patterns correlate with significant differences in foraging-related skull morphology. Analyses of mitochondrial sequences as well as microsatellites reveal signs of initial genetic differentiation. Conclusion: Our results suggest a key role of intra- as well as inter-specific niche segregation in the evolution of genetic structure among populations of a highly mobile species under conditions of free movement. Given the monophyletic arrival of the sea lions on the archipelago, our study challenges the view that geographical barriers are strictly needed for the build-up of genetic divergence. The study further raises the interesting prospect that in social, colonially breeding mammals additional forces, such as social structure or feeding traditions, might bear on the genetic partitioning of populations.
Springer Science and Business Media LLC
2008
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17837730
https://pub.uni-bielefeld.de/record/1783773
https://pub.uni-bielefeld.de/download/1783773/2314261
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1471-2148-8-150
info:eu-repo/semantics/altIdentifier/issn/1471-2148
info:eu-repo/semantics/altIdentifier/wos/000256402800002
info:eu-repo/semantics/altIdentifier/pmid/18485220
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1785080
2018-07-24T12:59:25Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Oscillating magnetic field disrupts magnetic orientation in Zebra finches, Taeniopygia guttata
Keary, Nina
Ruploh, Tim
Voss, Joe
Thalau, Peter
Wiltschko, Roswitha
Wiltschko, Wolfgang
Bischof, Hans-Joachim
ddc:590
Keary N, Ruploh T, Voss J, et al. Oscillating magnetic field disrupts magnetic orientation in Zebra finches, Taeniopygia guttata. <em>Frontiers in Zoology</em>. 2009;6(1):25.
Background: Zebra finches can be trained to use the geomagnetic field as a directional cue for short distance orientation. The physical mechanisms underlying the primary processes of magnetoreception are, however, largely unknown. Two hypotheses of how birds perceive magnetic information are mainly discussed, one dealing with modulation of radical pair processes in retinal structures, the other assuming that iron deposits in the upper beak of the birds are involved. Oscillating magnetic fields in the MHz range disturb radical pair mechanisms but do not affect magnetic particles. Thus, application of such oscillating fields in behavioral experiments can be used as a diagnostic tool to decide between the two alternatives. Methods: In a setup that eliminates all directional cues except the geomagnetic field zebra finches were trained to search for food in the magnetic north/south axis. The birds were then tested for orientation performance in two magnetic conditions. In condition 1 the horizontal component of the geomagnetic field was shifted by 90 degrees using a helmholtz coil. In condition 2 a high frequently oscillating field (1.156 MHz) was applied in addition to the shifted field. Another group of birds was trained to solve the orientation task, but with visual landmarks as directional cue. The birds were then tested for their orientation performance in the same magnetic conditions as applied for the first experiment. Results: The zebra finches could be trained successfully to orient in the geomagnetic field for food search in the north/south axis. They were also well oriented in test condition 1, with the magnetic field shifted horizontally by 90 degrees. In contrast, when the oscillating field was added, the directional choices during food search were randomly distributed. Birds that were trained to visually guided orientation showed no difference of orientation performance in the two magnetic conditions. Conclusion: The results indicate that zebra finches use a receptor that bases on radical pair processes for sensing the direction of the earth magnetic field in this short distance orientation behavior.
Springer Science + Business Media
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17850807
https://pub.uni-bielefeld.de/record/1785080
https://pub.uni-bielefeld.de/download/1785080/2314690
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-6-25
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000272217600001
info:eu-repo/semantics/altIdentifier/pmid/19852792
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1780955
2018-07-24T12:59:14Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Flight cost and economy of nectar-feeding in the bat Glossophaga Soricina (Phyllostomidae; Glossophaginae)
Winter, York
Helversen, Otto von
Norberg, Ulla M.
Kunz, Thomas H.
Steffensen, John Fleng
Barthlott, W.
Zoologisches Forschungsinstitut und Museum Alexander Koenig
daily energy expenditure
Phyllostomidae
flight cost
time budget
Glossophaga soricina
ddc:590
Winter Y, Helversen O von, Norberg UM, Kunz TH, Steffensen JF. Flight cost and economy of nectar-feeding in the bat Glossophaga Soricina (Phyllostomidae; Glossophaginae). In: Barthlott W, Zoologisches Forschungsinstitut und Museum Alexander Koenig, eds. <em>Animal plant interactions in tropical environments</em>. Results of the annual meeting of the German Society for Tropical Ecology. Vol 1992. Bonn; 1993: 167-174.
The cost of forward flight for a 11.7 g nectar-feeding bat Glossophaga soricina (Phyllostomidae; Glossophaginae) was estimated to be 5.888 kJ h -1 (1.63 W). To obtain this estimate, we quantified the amount of time allocated to specific activities and the animal´s daily energy intake in captivity for 17 separate 24-hour-periods. These data were arrangedin a set of daily energy-balance equations with the energy coefficients for each activity as unknown parameters. These equations were solved for the unknown coefficients b ymultiple lonear regression analysis. Using our estimate of flight cost and values for daily energy expenditure from the literature, we estimated how a free-ranging nectar-feeding bat allocates time and energy among different activities.
1993
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-23008
https://pub.uni-bielefeld.de/record/1780955
https://pub.uni-bielefeld.de/download/1780955/2313108
eng
info:eu-repo/semantics/altIdentifier/isbn/3-925382-36-4
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1780961
2018-07-24T12:58:09Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Nectar concentration preference and water balance in a flower visiting bat, Glossophaga Soricina Antillarum
Roces, Flavio
Winter, York
von Helversen, Otto
Barthlott, W.
Zoologisches Forschungsinstitut und Museum Alexander Koenig
nectar concentration
Glossophaga soricina antillarum
bat
food selection
water balance
ddc:590
Roces F, Winter Y, von Helversen O. Nectar concentration preference and water balance in a flower visiting bat, Glossophaga Soricina Antillarum. In: Barthlott W, Zoologisches Forschungsinstitut und Museum Alexander Koenig, eds. <em>Animal plant interactions in tropical environments</em>. Results of the annual meeting of the German Society for Tropical Ecology. Vol 1992. Bonn; 1993: 159-165.
Nectar concentration preference of flower visiting bats Glossophaga soricina antillarum was studied in the laboratory. In a series of dual choice tests using sugar concentrations from 10 to 80 %, the bats preferred the higher nectar concentration up to a maximum of 50 %. When presented simultaneously with nectar and additional water, the bats took more water, depending on the nectar concentration offered. The regular distribution of nectar and water intake during the activity period resulted in a roughly constant mean ingested concentration. Its maximal value agreed with that of the preferred nectar concentration, indicating that water needs played a role in determining the upper limit of an acceptable concentration. In preliminary experiments with ad libitum-feeders, sugar intake rate was maximal at 60 % despite the high viscosity at this concentration. Results are discussed in relation to the evolution of nectar concentration in bat-pollinated flowers.
1993
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17809610
https://pub.uni-bielefeld.de/record/1780961
https://pub.uni-bielefeld.de/download/1780961/2313109
eng
info:eu-repo/semantics/altIdentifier/isbn/3-925382-36-4
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1780965
2018-07-24T12:59:19Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The cost of hovering and forward flight in a nectar-feeding bat, Glossophaga Soricina, estimated from aerodynamic theory
Norberg, Ulla M.
Kunz, Thomas H.
Steffensen, John Fleng
Winter, York
von Helversen, Otto
aerodynamics
Glossophaga soricina
bat
induced velocity
flight energetics
ddc:590
Norberg UM, Kunz TH, Steffensen JF, Winter Y, von Helversen O. The cost of hovering and forward flight in a nectar-feeding bat, Glossophaga Soricina, estimated from aerodynamic theory. <em>Journal of Experimental Biology</em>. 1993;182(1):207-227.
The Company of Biologists
1993
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17809656
https://pub.uni-bielefeld.de/record/1780965
https://pub.uni-bielefeld.de/download/1780965/2313110
eng
info:eu-repo/semantics/altIdentifier/issn/1460-2431
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1780994
2018-07-24T12:58:00Z
conference_abstract
doc-type:other
ddc:590
conference_abstractFtxt
open_access
Sozialverhalten und räumliche Organisation von Zwergmäusen (Micromys minutus PALLAS 1778) [Abstract]
Wilde, Matthias ; https://orcid.org/0000-0002-1630-3263
Söllner, Tobias
Sachser, Norbert
ddc:590
Wilde M, Söllner T, Sachser N. Sozialverhalten und räumliche Organisation von Zwergmäusen (Micromys minutus PALLAS 1778) [Abstract]. <em>Verhandlungen der Deutschen Zoologischen Gesellschaft</em>. 1994;87:65.
1994
http://purl.org/coar/resource_type/c_c94f
info:eu-repo/semantics/other
doc-type:other
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-23247
https://pub.uni-bielefeld.de/record/1780994
https://pub.uni-bielefeld.de/download/1780994/2313132
deu
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781834
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Spatial proximity and mate-specific behaviour in a flock of budgerigars (Melopsittacus undulatus; Aves, Psittacidae)
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Spatial proximity and mate-specific behaviour in a flock of budgerigars (Melopsittacus undulatus; Aves, Psittacidae). <em>Zeitschrift für Tierpsychologie</em>. 1976;41:307-331.
Parey
1976
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28041
https://pub.uni-bielefeld.de/record/1781834
https://pub.uni-bielefeld.de/download/1781834/2313540
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781835
2018-07-24T12:59:08Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Learning experiments on individual recognition in budgerigars (Melopsittacus undulatus)
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Learning experiments on individual recognition in budgerigars (Melopsittacus undulatus). <em>Zeitschrift für Tierpsychologie</em>. 1976;41:372-395.
Parey
1976
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28054
https://pub.uni-bielefeld.de/record/1781835
https://pub.uni-bielefeld.de/download/1781835/2313541
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781836
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The influence of separation on the pair bond in budgerigars (Melopsittacus undulatus; Aves, Psittacidae
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. The influence of separation on the pair bond in budgerigars (Melopsittacus undulatus; Aves, Psittacidae. <em>Zeitschrift für Tierpsychologie</em>. 1976;41:396-408.
Parey
1976
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28068
https://pub.uni-bielefeld.de/record/1781836
https://pub.uni-bielefeld.de/download/1781836/2313542
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781837
2018-07-24T12:58:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Recognition of the individual nesting box in budgerigars
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Recognition of the individual nesting box in budgerigars. <em>Zeitschrift für Tierpsychologie</em>. 1976;42:1-11.
Parey
1976
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28071
https://pub.uni-bielefeld.de/record/1781837
https://pub.uni-bielefeld.de/download/1781837/2313543
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781838
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Feeding territories and breeding success of South Polar skuas
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Feeding territories and breeding success of South Polar skuas. <em>The Auk</em>. 1978;95(1):23-33.
University of California Press
1978
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28097
https://pub.uni-bielefeld.de/record/1781838
https://pub.uni-bielefeld.de/download/1781838/2313544
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781839
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Cephalopods in the diet of fur seals of the Galápagpos islands
Clarke, Malcolm R.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Clarke MR, Trillmich F. Cephalopods in the diet of fur seals of the Galápagpos islands. <em>Journal of zoology</em>. 1980;190:211-215.
Wiley-Blackwell
1980
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28109
https://pub.uni-bielefeld.de/record/1781839
https://pub.uni-bielefeld.de/download/1781839/2313545
eng
info:eu-repo/semantics/altIdentifier/issn/0022-5460
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781841
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Distribution and abundance of sea lions (Otaria byronia) and fur seals (Arctocephalus australis) in Peru
Majluf, Patricia
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Majluf P, Trillmich F. Distribution and abundance of sea lions (Otaria byronia) and fur seals (Arctocephalus australis) in Peru. <em>Zeitschrift für Säugetierkunde</em>. 1981;46:384-393.
Urban & Fischer
1981
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28110
https://pub.uni-bielefeld.de/record/1781841
https://pub.uni-bielefeld.de/download/1781841/2313546
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3468
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781843
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
First observations on colony structure, behavior and vocal repertoire of the South American fur seal (Arctocephalus australis, Zimmermann 1783) in Peru
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Majluf, Patricia
ddc:590
Trillmich F, Majluf P. First observations on colony structure, behavior and vocal repertoire of the South American fur seal (Arctocephalus australis, Zimmermann 1783) in Peru. <em>Zeitschrift für Säugetierkunde</em>. 1981;46:310-322.
Urban & Fischer
1981
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28121
https://pub.uni-bielefeld.de/record/1781843
https://pub.uni-bielefeld.de/download/1781843/2313547
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3468
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781845
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Mutual mother-pup recognition in Galápagos fur seals and sea lions: cues used and functional significance
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Mutual mother-pup recognition in Galápagos fur seals and sea lions: cues used and functional significance. <em>Behaviour</em>. 1981;78(1):21-42.
Field observations on Galápagos fur seals and sea lions indicate mutual recognition between mother and pup. High calling activity and intensive interactions of mother and pup immediately after birth appear to establish recognition within the first few hours (mother) or days (pup) of birth. Females of both species nurse exclusively their own young and reject strange ones, sometimes very aggressively. The prompt reactions of pups to their mothers' Pup Attraction Calls (PACs) suggest that the mother too is individually recognized. The analysis of the PACs of mothers and the bleats of pups shows that interindividual variability of calls provides a sufficient basis for individual recognition in both species. Playback experiments with PACs of fur seals and sea lions show that pups (10 days to 2 years old) can discriminate between their mothers' and strange females' PACs. Mother recognition reduces the frequency of dangerous encounters of pups with strange females or allows pups to approach strangers especially careful, thus reducing the risk of injury. Only by means of individual recognition can females in crowded otariid rookeries limit maternal investment to their own offspring. The mechanism of individual recognition in dispersed, ice-breeding phocids and colonially breeding otarid seals may be different.
Brill
1981
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818453
https://pub.uni-bielefeld.de/record/1781845
https://pub.uni-bielefeld.de/download/1781845/2313548
eng
info:eu-repo/semantics/altIdentifier/doi/10.1163/156853981X00248
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/altIdentifier/issn/1568-539X
info:eu-repo/semantics/altIdentifier/wos/A1981MP19400002
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781847
2018-07-24T12:59:08Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effects of the lunar cycle on the Galápagos fur seal, Arctocephalus galapagoensis
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Mohren, Werner
ddc:590
Trillmich F, Mohren W. Effects of the lunar cycle on the Galápagos fur seal, Arctocephalus galapagoensis. <em>Oecologia</em>. 1981;48(1):85-92.
During the 1977 and 1979 reproductive periods of the Galápagos fur seals a census taken in the mornings and evenings at Cabo Hammond, Fernandina, showed a marked, synodic lunar rhythm in numbers of animals ashore. About twice as many fur seals were ashore at full moon than at new moon. By use of two independent Fourier analysis methods, the curve of the morning counts is shown to lag 15°–20° of the lunar month behind the curve of the evening counts. The lunar effect is demonstrated for males, females, and immatures. The rhythm is also seen is demonstrated for males, females, and immatures. The rhythm is also seen in attendance data from 13 individually marked females, all but one nursing young. Reproductive events show the lunar rhythm much less markedly than do numbers ashore. This and the clear rhythm in immature numbers make it very likely that the rhythm is a year-round phenomenon, independent of reproduction. There is no reason to assume that fur seals stay on land during moonlit nights especially for social interaction. It is then hypothesized that fur seals avoid moonlight at sea. If so, the peak of numbers ashore at full moon and the negative phase angle difference of the evening curve against the morning curve can be explained with the shift, and the varying duration and brightness, of the moonlit part of the night over the lunar cycle. Two hypotheses which might account for this moonlight avoidance are discussed: (1) predator (shark) avoidance and (2) varying feeding efficiency of the fur seals due to the influence of moonlight on the vertical distribution of prey.
Springer Science and Business Media LLC
1981
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818476
https://pub.uni-bielefeld.de/record/1781847
https://pub.uni-bielefeld.de/download/1781847/2313549
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00346992
info:eu-repo/semantics/altIdentifier/issn/0029-8549
info:eu-repo/semantics/altIdentifier/issn/1432-1939
info:eu-repo/semantics/altIdentifier/wos/A1981LE91600013
info:eu-repo/semantics/altIdentifier/pmid/28309937
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781850
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The breeding season of the flightless cormorant Nannopterum harrisi at Cabo Hammond, Fernandina
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Trillmich, Krisztina G. K.
Limberger, Dominique
Arnold, Werner
ddc:590
Trillmich F, Trillmich KGK, Limberger D, Arnold W. The breeding season of the flightless cormorant Nannopterum harrisi at Cabo Hammond, Fernandina. <em>The Ibis</em>. 1983;125(2):221-223.
Wiley
1983
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818509
https://pub.uni-bielefeld.de/record/1781850
https://pub.uni-bielefeld.de/download/1781850/2313550
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1474-919X.1983.tb03101.x
info:eu-repo/semantics/altIdentifier/issn/0019-1019
info:eu-repo/semantics/altIdentifier/wos/A1983QJ87900007
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781855
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Der Brutraum beeinflußt Gelegegröße und Fortpflanzungserfolg beim Star (Sturnus vulgaris)
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Hudde, Hans
ddc:590
Trillmich F, Hudde H. Der Brutraum beeinflußt Gelegegröße und Fortpflanzungserfolg beim Star (Sturnus vulgaris). <em>Journal für Ornithologie</em>. 1984;125(1):75-79.
Springer Science and Business Media LLC
1984
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818550
https://pub.uni-bielefeld.de/record/1781855
https://pub.uni-bielefeld.de/download/1781855/2313551
deu
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01652940
info:eu-repo/semantics/altIdentifier/issn/0021-8375
info:eu-repo/semantics/altIdentifier/issn/1439-0361
info:eu-repo/semantics/altIdentifier/wos/A1984SF63000007
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781858
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The mating systems of pinnipeds and marine iguanas: convergent evolution of polygyny
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Trillmich, Krisztina G. K.
Sexual selection
evolution of polygyny
Pinnipeds
Marine iguana
female gregariousness
ddc:590
Trillmich F, Trillmich KGK. The mating systems of pinnipeds and marine iguanas: convergent evolution of polygyny. <em>Biological Journal of the Linnean Society</em>. 1984;21:209-216.
The convergent polygynous mating systems of marine iguanas and otariid pinnipeds depend on the existence of large female aggregations. These can build up where abundant marine food resources occur around oceanic islands which harbour fewer predators than continental areas. For marine iguanas distribution of food resources appears to determine the location of colonies, while for pinnipeds habitat choice is more decisive. In marine iguanas females benefit from gregariousness through reduced predation risk and social thermoregulation. In pinnipeds, sea lions may derive thermoregulatory benefits from gregariousness, while fur seals appear to be largely non-gregarious. In both groups males defend territories in areas of high female density. Large sexual size dimorphism presumably evolved in response to strong selection for high fighting potential of males. The capability to fast for prolonged periods of territory tenure is considered a secondary benefit of large male size, but not the driving force behind its evolution. We hypothesize that marginal males, through continuous sexual harassment of females that stay outside territories, have exerted pressure towards the evolution of female gregariousness.
Wiley Blackwell (Blackwell Publishing)
1984
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28176
https://pub.uni-bielefeld.de/record/1781858
https://pub.uni-bielefeld.de/download/1781858/2313552
eng
info:eu-repo/semantics/altIdentifier/issn/0024-4066
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781860
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Time budget in Galápagos fur seal pups: the influence of the mother's presence and absence on pup activity and play
Arnold, Werner
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Arnold W, Trillmich F. Time budget in Galápagos fur seal pups: the influence of the mother's presence and absence on pup activity and play. <em>Behaviour</em>. 1985;92:302-321.
Brill Academic Publishers
1985
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28181
https://pub.uni-bielefeld.de/record/1781860
https://pub.uni-bielefeld.de/download/1781860/2313553
eng
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781862
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Drastic effects of El Nino on Galapagos pinnipeds
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Limberger, Dominique
ddc:590
Trillmich F, Limberger D. Drastic effects of El Nino on Galapagos pinnipeds. <em>Oecologia</em>. 1985;67(1):19-22.
Population dynamics of pinnipeds living in the tropical upwelling ecosystem of the Galapagos were strongly influenced by the 1982–83 Southern Oscillation-El Nino (EN) event which was the strongest recorded in this century. The Galapagos fur seal (Arctocephalus galapagoensis) population lost the four youngest year classes (1980–1983) almost entirely and approximately 30% of the adult females and non-territorial males. Mortality of large territorial males was almost 100%. Most of the 1982 year class of Galapagos sea lions (Zalophus californianus wollebaeki) died and there was a much lower pup production in the breeding season following EN. Recurrent EN events must strongly influence age structure and average population size of these and other otariid species depending on tropical upwelling ecosystems.
Springer Science and Business Media LLC
1985
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818622
https://pub.uni-bielefeld.de/record/1781862
https://pub.uni-bielefeld.de/download/1781862/2313554
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00378445
info:eu-repo/semantics/altIdentifier/issn/0029-8549
info:eu-repo/semantics/altIdentifier/issn/1432-1939
info:eu-repo/semantics/altIdentifier/wos/A1985ANM6000003
info:eu-repo/semantics/altIdentifier/pmid/28309839
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781867
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Temperature regulation and microhabitat choice by free-ranging Galapagos fur seal pups (Arctocephalus galapagoensis)
Limberger, Dominique
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Biebach, Herbert
Stevenson, Robert D.
ddc:590
Limberger D, Trillmich F, Biebach H, Stevenson RD. Temperature regulation and microhabitat choice by free-ranging Galapagos fur seal pups (Arctocephalus galapagoensis). <em>Oecologia</em>. 1986;69(1):53-59.
Springer Science and Business Media LLC
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818676
https://pub.uni-bielefeld.de/record/1781867
https://pub.uni-bielefeld.de/download/1781867/2313557
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00399037
info:eu-repo/semantics/altIdentifier/issn/0029-8549
info:eu-repo/semantics/altIdentifier/issn/1432-1939
info:eu-repo/semantics/altIdentifier/wos/A1986A942600008
info:eu-repo/semantics/altIdentifier/pmid/28311684
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781872
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Are endotherms emancipated?: some considerations on the cost of reproduction
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Are endotherms emancipated?: some considerations on the cost of reproduction. <em>Oecologia</em>. 1986;69(4):631-633.
Springer Science and Business Media LLC
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818726
https://pub.uni-bielefeld.de/record/1781872
https://pub.uni-bielefeld.de/download/1781872/2313558
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00410375
info:eu-repo/semantics/altIdentifier/issn/0029-8549
info:eu-repo/semantics/altIdentifier/issn/1432-1939
info:eu-repo/semantics/altIdentifier/wos/A1986D312800024
info:eu-repo/semantics/altIdentifier/pmid/28311628
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781874
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Maternal investment and sex-allocation in the Galapagos fur seal, Arctocephalus galapagoensis
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Maternal investment and sex-allocation in the Galapagos fur seal, Arctocephalus galapagoensis. <em>Behavioral Ecology and Sociobiology</em>. 1986;19(3):157-164.
Maternal investment and sex-allocation were measured in a large, sexually dimorphic mammal, the Galapagos fur seal (Arctocephalus galapagoensis). The sex ratio at birth was 1.06. Males were always heavier than females and, at least initially, grew faster. Growth was variable from year to year suggesting energetic constraints on maternal investment. Sucking time conrrelated with milk intake. Mothers suckled yearling and 2-year-old sons more than daughters of the same age. Age at weaning appeared to be the same in both sexes or even slightly greater in males. No sex differences was found in mortality prior to weaning or in post-weaning dispersal. Birth rates of females with yearlings or 2-year-olds were significantly lower than those of females with no dependent young. Mothers invested more in sons than in daughters until weaning. It is unlikely that higher post-weaning investment in daughters balances the higher pre-weaning investment in sons. Data on sex ratio at birth, different growth rates, and weaning age of the sexes are typical of otariid seals as a group. The results of this study fit Maynard Smith's (1980) model of the evolution of sex allocation better than Fisher's (1930).
Springer Science + Business Media
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818745
https://pub.uni-bielefeld.de/record/1781874
https://pub.uni-bielefeld.de/download/1781874/2313559
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00300855
info:eu-repo/semantics/altIdentifier/issn/0
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781876
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Milk of the Galápagos fur seal and sea lion, with a comparison of the milk of eared selas (Otariidae)
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Lechner, Erika
ddc:590
Trillmich F, Lechner E. Milk of the Galápagos fur seal and sea lion, with a comparison of the milk of eared selas (Otariidae). <em>Journal of zoology</em>. 1986;209:271-277.
Wiley-Blackwell
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28271
https://pub.uni-bielefeld.de/record/1781876
https://pub.uni-bielefeld.de/download/1781876/2313560
eng
info:eu-repo/semantics/altIdentifier/issn/0022-5460
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781878
2018-07-24T12:59:08Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Foraging strategies of the marine iguana, Amblyrhynchus cristatus
Trillmich, Krisztina G. K.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich KGK, Trillmich F. Foraging strategies of the marine iguana, Amblyrhynchus cristatus. <em>Behavioral Ecology and Sociobiology</em>. 1986;18(4):259-266.
Springer Science and Business Media LLC
1986
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818787
https://pub.uni-bielefeld.de/record/1781878
https://pub.uni-bielefeld.de/download/1781878/2313561
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00300002
info:eu-repo/semantics/altIdentifier/issn/0340-5443
info:eu-repo/semantics/altIdentifier/issn/1432-0762
info:eu-repo/semantics/altIdentifier/wos/A1986A210900003
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781881
2018-07-24T12:59:20Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Female aggression and male peace-keeping in a cichlid fish harem: conflict between and within the sexes in Lamprologus ocellatus
Walter, Bernhard
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Male interference
Polygyny Sexual conflict
Lamprologus ocellatus
ddc:590
Walter B, Trillmich F. Female aggression and male peace-keeping in a cichlid fish harem: conflict between and within the sexes in Lamprologus ocellatus. <em>Behavioral Ecology and Sociobiology</em>. 1994;34(2):105-112.
Conflicts of interest within and between the sexes are important processes leading to variability in mating systems. The behavioral interactions mediating conflict are little documented. We studied pairs and harems of the snail-shell inhabiting cichlid fish Lamprologus ocellatus in the laboratory. Due to their larger size, males controlled the resource that limited breeding: snail shells. Males were able to choose among females ready to spawn. Females were only accepted if they produced a clutch within a few days of settling. When several females attempted to settle simultaneously the larger female settled first. Females were least aggressive when guarding eggs. Secondary females were more likely to settle when the primary female was guarding eggs. In established harems females continued to be aggressive against each other. The male intervened in about 80% of female aggressive interactions. Male intervention activity correlated with the frequency of aggression among the females in his harem. The male usually attacked the aggressor and chased her back to her own snail shell. When a male was removed from his harem, aggression between females increased immediately and usually the secondary female was expelled by the primary female within a few days. Time to harem break-up was shorter the more mobile the primary females´ young were and did not correlate with the size difference between harem females. Male L. ocellatus interfere actively in female conflict and keep the harem together against female interests. Female conflict presumably relates to the cost of sharing male parental investment and to the potential of predation by another female´s large juveniles on a female's own small juveniles.
Springer Science and Business Media LLC
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818819
https://pub.uni-bielefeld.de/record/1781881
https://pub.uni-bielefeld.de/download/1781881/2313562
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00164181
info:eu-repo/semantics/altIdentifier/issn/0340-5443
info:eu-repo/semantics/altIdentifier/issn/1432-0762
info:eu-repo/semantics/altIdentifier/wos/A1994MY90800004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781884
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis)
Costa, D. P.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Croxall, J. P.
ddc:590
Costa DP, Trillmich F, Croxall JP. Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis). <em>Behavioral Ecology and Sociobiology</em>. 1988;22(5):361-364.
Intraspecific allometry of pup mass as a function of maternal mass was analysed in Antarctic fur seals (Arctocephalus gazella), a highly dimorphic species. The allometric exponent was 0.6, much lower than in interspecific comparisons. Slopes were the same for mother-son pairs as for mother-daughter pairs, but adjusted means were significantly higher for the former, indicating higher reproductive effort of mothers of sons. The correlation of maternal mass with pup mass explained 59% of the variance in female pup mas but only 18% of that in male pup mass. Females appeared to produce sons which were as big as possible. Relative pup mass decreased with increasing maternal mass indicating a lower reproductive effort of bigger and presumably older mothers, contrary to expectations from life history theory. Sex ratio of pups showed no relation to maternal mass.
Springer Science + Business Media
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17818843
https://pub.uni-bielefeld.de/record/1781884
https://pub.uni-bielefeld.de/download/1781884/2313563
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00295105
info:eu-repo/semantics/altIdentifier/issn/0
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781925
2018-07-24T12:59:21Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable?
Dellinger, T.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Dellinger T, Trillmich F. Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable? <em>Canadian journal of zoology</em>. 1988;66(8):1865-1870.
Analysis of teleost sagittal otoliths contained in scats has been widely used to determine the diet of seals. This method is based on the assumption that relative frequencies of otoliths in scats faithfully reflect those offish in the diet. This assumption has rarely been tested experimentally. We compared the ratios of herring (Clupea harengus) to sprat (Sprattus sprattus) otoliths in faeces (output) of captive California sea lions (Zalophus californianus) and South American fur seals (Arctocephalus australis) with the ratios at feeding (input). Sea lions and fur seals showed no consistent differences in recovery rates and partial digestion of otoliths. Output ratios deviated only slightly from input ratios, the smaller sprat otoliths being underrepresented in the output by 8%. Only about 40% of the otoliths fed to the seals were found in the scats. For both species partial digestion of otoliths led to a 16% underestimation of fish length and a 35% underestimation of fish mass.
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28512
https://pub.uni-bielefeld.de/record/1781925
https://pub.uni-bielefeld.de/download/1781925/2313581
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781927
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Swimming velocities in otariids
Ponganis, Paul J.
Ponganis, Edward P.
Ponganis, Katharine V.
Kooyman, Gerald L.
Gentry, Roger L.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Ponganis PJ, Ponganis EP, Ponganis KV, Kooyman GL, Gentry RL, Trillmich F. Swimming velocities in otariids. <em>Canadian journal of zoology</em>. 1990;68(10).
Velocities during surface swimming and diving were measured with microprocessor recorders in four otariid species: northern fur seals (Callorhinus ursinus), Galapagos sea lions (Zalophus californianus wollebaeki), Galapagos fur seals (Arctocephalus galapagoensis), and Hooker's sea lions (Phocarctos hookeri). Mean surface swimming velocities ranged from 0.6 to 1.9 m/s. Transit distances to feeding sites (1.2–90 km) were calculated using these velocities. Dive velocities, recorded every 15 s, ranged from 0.9 to 1.9 m/s. These velocities were consistent with calculated minimal cost of transport velocities in the smaller species. Using time partitioning, the metabolic cost of a northern fur seal foraging trip is estimated on the basis of recorded velocities and their calculated energy costs. This value is within 6% of that previously made with doubly labeled water techniques.
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28525
https://pub.uni-bielefeld.de/record/1781927
https://pub.uni-bielefeld.de/download/1781927/2313582
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781933
2018-07-24T12:58:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Characterization of proteins and fatty acid composition in galapagos fur seal milk. Occurrence of whey and casein protein polymorphisms
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Kirchmeier, Dorothea
Kirchmeier, Otto
Krause, Ingolf
Lechner, Erika
Scherz, Heimo
Eichinger, Hans
Seewald, Markus
ddc:590
Trillmich F, Kirchmeier D, Kirchmeier O, et al. Characterization of proteins and fatty acid composition in galapagos fur seal milk. Occurrence of whey and casein protein polymorphisms. <em>Comparative Biochemistry and Physiology, Part B: Biochemistry and Molecular Biology</em>. 1988;90(2):447-452.
Elsevier BV
1988
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819339
https://pub.uni-bielefeld.de/record/1781933
https://pub.uni-bielefeld.de/download/1781933/2313583
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/0305-0491(88)90102-2
info:eu-repo/semantics/altIdentifier/issn/0305-0491
info:eu-repo/semantics/altIdentifier/wos/A1988N748400034
info:eu-repo/semantics/altIdentifier/pmid/3409671
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781945
2018-07-24T12:58:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Das Mikroklima im Nistkasten und seine Auswirkungen auf die Nestlinge beim Star (Sturnus vulgaris)
Erbelding-Denk, Claudia
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Erbelding-Denk C, Trillmich F. Das Mikroklima im Nistkasten und seine Auswirkungen auf die Nestlinge beim Star (Sturnus vulgaris). <em>Journal für Ornithologie</em>. 1990;131(1):73-84.
Springer Science and Business Media LLC
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28558
https://pub.uni-bielefeld.de/record/1781945
https://pub.uni-bielefeld.de/download/1781945/2313585
deu
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781947
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The behavioral ecology of maternal effort in fur seals and sea lions
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. The behavioral ecology of maternal effort in fur seals and sea lions. <em>Behaviour</em>. 1990;114(1):3-20.
Brill
1990
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819477
https://pub.uni-bielefeld.de/record/1781947
https://pub.uni-bielefeld.de/download/1781947/2313586
eng
info:eu-repo/semantics/altIdentifier/doi/10.1163/156853990X00022
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/altIdentifier/issn/1568-539X
info:eu-repo/semantics/altIdentifier/wos/A1990EA06900002
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781949
2018-07-24T12:59:21Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Foraging strategies of the Galapagos Marine Iguana (Amblyrhynchus Cristatus): adapting behavioral rules to ontogenetic size change
Wikelski, Martin
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Wikelski M, Trillmich F. Foraging strategies of the Galapagos Marine Iguana (Amblyrhynchus Cristatus): adapting behavioral rules to ontogenetic size change. <em>Behaviour</em>. 1994;128(3):255-279.
Ontogenetic development in reptiles entails major changes in size-related foraging options. We studied the changes in foraging behavior of marine iguanas. In this species, size increases about twenty- to hundredfold from hatching to full adult size. The foraging strategy of marine iguanas was studied at Miedo on Santa Fe Island in the Galapagos archipelago During low tide, large marine iguanas (>250 mm snout vent length (SVL)) foraged more in the lower intertidal than small ones (<250 mm SVL) which preferred the upper intertidal with higher temperatures and less frequent wave washing. Animals usually returned to the same foraging site day after day and had lower food intake after changing their foraging site. Feeding accounted for 60% of the time spent in the intertidal. Smaller animals fed every day, larger ones only every other day. Smaller individuals shuttled faster between foraging and basking sites than larger ones. Total feeding time per day was, however, the same for both size classes. At neap tides (= high water level at low tide) animals had shorter foraging bouts than at spring tides with much lower water levels at peak low tide. Length of feeding bouts depended most on wave action, time of low tide (during the daylight period), and body mass of an animal. Small animals fed significantly less at higher than at lower wave activities. All animals on Santa Fe spent more time feeding in the intertidal than in the subtidal. Only large males additionally foraged subtidally and the more so the bigger they were. During the reproductive season, territorial males were less likely to go foraging, but when feeding, territorials fed more subtidally than non-territorials, went foraging earlier, and spent less time foraging in the IT than non-territorials. Ability to resist wave drag increased with body size but did not decrease at lower body temperature, whereas running speed did so significantly. Bite frequency during foraging also decreased with decreasing body temperature and smaller, younger animals had higher bite rates than older, bigger ones. White-painted animals rewarmed slower than naturally black ones and partially compensated for this by shortening foraging bouts but increasing their number. The observed age-related changes in foraging behavior can be explained by postulating a rule of the form 'forage while warm and warm up when getting inefficient at grazing'. Of course, animals will also stop feeding should the stomach be filled before the end of the low tide cycle. To explain age- and motivation-related differences in foraging behavior, the only change that needs to be postulated is in the thresholds of body temperature inducing switches from foraging to warming-up and back. These changes are adaptive responses to size-related changes in costs and benefits of foraging in a cool, wave-washed environment.
Brill
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819497
https://pub.uni-bielefeld.de/record/1781949
https://pub.uni-bielefeld.de/download/1781949/2313587
eng
info:eu-repo/semantics/altIdentifier/doi/10.1163/156853994X00280
info:eu-repo/semantics/altIdentifier/issn/0005-7959
info:eu-repo/semantics/altIdentifier/issn/1568-539X
info:eu-repo/semantics/altIdentifier/wos/A1994PB93800004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781952
2018-07-24T12:58:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The complete primary structure of the marine carnivora, galapagoes fur seal (Arctocephalus galapagoensis, Otariidae) hemoglobins
Jahan, Meeno
Ahmed, Aftab
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Braunitzer, Gerhard
Fur seal
marine carnivora
homology
primary structure
hemoglobin
ddc:590
Jahan M, Ahmed A, Trillmich F, Braunitzer G. The complete primary structure of the marine carnivora, galapagoes fur seal (Arctocephalus galapagoensis, Otariidae) hemoglobins. <em>Journal of Protein Chemistry</em>. 1991;10(3):257-263.
Springer Science and Business Media LLC
1991
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819527
https://pub.uni-bielefeld.de/record/1781952
https://pub.uni-bielefeld.de/download/1781952/2313588
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01025624
info:eu-repo/semantics/altIdentifier/issn/0277-8033
info:eu-repo/semantics/altIdentifier/issn/1573-4943
info:eu-repo/semantics/altIdentifier/wos/A1991FV83300001
info:eu-repo/semantics/altIdentifier/pmid/1910457
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781957
2018-07-24T12:58:09Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Conservation problems on Galápagos: the showcase of evolution in danger
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Conservation problems on Galápagos: the showcase of evolution in danger. <em>Die Naturwissenschaften</em>. 1992;79(1):1-6.
The Galapagos Islands still possess a unique terrestrial and marine flora and fauna. The uniqueness of this ecosystem has evolved because of and depends on isolation from the mainland and among islands. This isolation is increasingly diminished through tourism and, in its wake, the immigration of Ecuadoreans who settle in Galapagos to profit from the economic boom accompanying tourism. The breakdown of isolation threatens the whole ecosystem of the Galapagos, therefore plans for a quarantine system are presently being developed by the Charles Darwin Research Station and the Galapagos National Park Service.
Springer Science and Business Media LLC
1992
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819572
https://pub.uni-bielefeld.de/record/1781957
https://pub.uni-bielefeld.de/download/1781957/2313589
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01132271
info:eu-repo/semantics/altIdentifier/issn/0028-1042
info:eu-repo/semantics/altIdentifier/issn/1432-1904
info:eu-repo/semantics/altIdentifier/wos/A1992HC10800001
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781959
2018-07-24T12:58:02Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Influence of rare ecological events on pinniped social structure and population dynamics
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Boyd, Ian L.
ddc:590
Trillmich F. Influence of rare ecological events on pinniped social structure and population dynamics. In: Boyd IL, ed. <em>Marine mammals</em>. Symposia of the Zoological Society of London ; 66. Oxford [u.a.]: Clarendon [u.a.]; 1993: 95-114.
Clarendon [u.a.]
1993
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28604
https://pub.uni-bielefeld.de/record/1781959
https://pub.uni-bielefeld.de/download/1781959/2313590
eng
info:eu-repo/semantics/altIdentifier/isbn/0-19-854069-8
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781960
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)
Wikelski, Martin
Gall, B.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Food intake
Digestion
Marine iguana
Ontogeny
Herbivory
ddc:590
Wikelski M, Gall B, Trillmich F. Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell). <em>Oecologia</em>. 1993;94(3):373-379.
Springer Science and Business Media LLC
1993
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17819606
https://pub.uni-bielefeld.de/record/1781960
https://pub.uni-bielefeld.de/download/1781960/2313591
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/BF00317112
info:eu-repo/semantics/altIdentifier/issn/0029-8549
info:eu-repo/semantics/altIdentifier/issn/1432-1939
info:eu-repo/semantics/altIdentifier/wos/A1993LJ04100011
info:eu-repo/semantics/altIdentifier/pmid/28313674
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781964
2018-07-24T12:58:09Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Mechanisms of kin-correlated behavior: group report
Harvey, P. H.
Baker, M. C.
Bateson, P. P. G.
Bischof, N.
Emlen, S. T.
Hölldobler, B.
Kramer, B.
Linsenmair, K. E.
Markl, Hubert
Marler, H.
Menzel, E. W.
Michener, C. D.
Milinski, M.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Markl, Hubert
ddc:590
Harvey PH, Baker MC, Bateson PPG, et al. Mechanisms of kin-correlated behavior: group report. In: Markl H, ed. <em>Evolution of social behavior, hypotheses and empirical tests: report of the Dahlem Workshop on Evolution of Social Behavior, Hypotheses and empirical tests, Berlin 1980, February 18 - 22</em>. Life sciences research reports ; 18. Weinheim [u.a.]: Verl. Chemie; 1980: 183-202.
Verl. Chemie
1980
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28629
https://pub.uni-bielefeld.de/record/1781964
https://pub.uni-bielefeld.de/download/1781964/2313592
eng
info:eu-repo/semantics/altIdentifier/isbn/3-527-12020-3
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781978
2018-07-24T12:58:02Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Diving behavior of Galápagos fur seals
Kooyman, Gerald L.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Gentry, Roger L.
Kooyman, Gerald L.
ddc:590
Kooyman GL, Trillmich F. Diving behavior of Galápagos fur seals. In: Gentry RL, Kooyman GL, eds. <em>Fur seals</em>. Princeton, NJ: Princeton Univ. Pr.; 1986: 186-195.
Princeton Univ. Pr.
1986
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28632
https://pub.uni-bielefeld.de/record/1781978
https://pub.uni-bielefeld.de/download/1781978/2313593
eng
info:eu-repo/semantics/altIdentifier/isbn/0-691-08400-9
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781980
2018-07-24T12:58:02Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Diving behavior of Galápagos sea lions
Kooyman, Gerald L.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Gentry, Roger L.
Kooyman, Gerald L.
ddc:590
Kooyman GL, Trillmich F. Diving behavior of Galápagos sea lions. In: Gentry RL, Kooyman GL, eds. <em>Fur seals</em>. Princeton, NJ: Princeton Univ. Pr.; 1986: 209-219.
Princeton Univ. Pr.
1986
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28640
https://pub.uni-bielefeld.de/record/1781980
https://pub.uni-bielefeld.de/download/1781980/2313594
eng
info:eu-repo/semantics/altIdentifier/isbn/0-691-08400-9
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781982
2018-07-24T12:59:21Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Attendance behavior of Galápagos fur seals
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Gentry, Roger L.
Kooyman, Gerald L.
ddc:590
Trillmich F. Attendance behavior of Galápagos fur seals. In: Gentry RL, Kooyman GL, eds. <em>Fur seals</em>. Princeton, NJ: Princeton Univ. Pr.; 1986: 168-185.
Princeton Univ. Pr.
1986
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28655
https://pub.uni-bielefeld.de/record/1781982
https://pub.uni-bielefeld.de/download/1781982/2313595
eng
info:eu-repo/semantics/altIdentifier/isbn/0-691-08400-9
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781986
2018-07-24T12:59:08Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Attendance behavior of Galápagos sea lions
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Gentry, Roger L.
Kooyman, Gerald L.
ddc:590
Trillmich F. Attendance behavior of Galápagos sea lions. In: Gentry RL, Kooyman GL, eds. <em>Fur seals</em>. Princeton, NJ: Princeton Univ. Pr.; 1986: 196-208.
Princeton Univ. Pr.
1986
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28672
https://pub.uni-bielefeld.de/record/1781986
https://pub.uni-bielefeld.de/download/1781986/2313597
eng
info:eu-repo/semantics/altIdentifier/isbn/0-691-08400-9
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781987
2018-07-24T12:59:21Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Attendance and diving behavior of South American fur seals during El Nino in 1983
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Kooyman, Gerald L.
Majluf, Patricia
Sanchez-Grinan, M.
Gentry, Roger L.
Kooyman, Gerald L.
ddc:590
Trillmich F, Kooyman GL, Majluf P, Sanchez-Grinan M. Attendance and diving behavior of South American fur seals during El Nino in 1983. In: Gentry RL, Kooyman GL, eds. <em>Fur seals</em>. Princeton, NJ: Princeton Univ. Pr.; 1986: 153-167.
Princeton Univ. Pr.
1986
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28684
https://pub.uni-bielefeld.de/record/1781987
https://pub.uni-bielefeld.de/download/1781987/2313598
eng
info:eu-repo/semantics/altIdentifier/isbn/0-691-08400-9
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1781991
2018-07-24T12:59:16Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Conflicts between and within the sexes in sexual selection: group report
West-Eberhard, M. J.
Bradbury, Jack W.
Davies, N. B.
Gouyon, P. H.
Hammerstein, P.
Parker, G. A.
Queller, D. C.
Sachser, N.
Slagsvold, T.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Vogel, C.
Bradbury, Jack W.
ddc:590
West-Eberhard MJ, Bradbury JW, Davies NB, et al. Conflicts between and within the sexes in sexual selection: group report. In: Bradbury JW, ed. <em>Sexual selection: testing the alternatives</em>. Life sciences research reports ; 39. Chichester: Wiley; 1987: 180-195.
Wiley
1987
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28693
https://pub.uni-bielefeld.de/record/1781991
https://pub.uni-bielefeld.de/download/1781991/2313599
eng
info:eu-repo/semantics/altIdentifier/isbn/0-471-91624-2
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782004
2018-07-24T12:59:08Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Biological consequences of the 1982-83 El Nino in the eastern Pacific
Arntz, W.
Pearcy, W. G.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Trillmich, Fritz
ddc:590
Arntz W, Pearcy WG, Trillmich F. Biological consequences of the 1982-83 El Nino in the eastern Pacific. In: Trillmich F, ed. <em>Pinnipeds and El Nino</em>. Ecological studies ; 88. Berlin [u.a.]: Springer; 1991: 22-42.
Springer
1991
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28723
https://pub.uni-bielefeld.de/record/1782004
https://pub.uni-bielefeld.de/download/1782004/2313602
eng
info:eu-repo/semantics/altIdentifier/isbn/3-540-53634-5
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782007
2018-07-24T12:59:16Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
Introductory remarks on the natural history of fur seals
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Trillmich, Fritz
ddc:590
Trillmich F. Introductory remarks on the natural history of fur seals. In: Trillmich F, ed. <em>Pinnipeds and El Nino</em>. Ecological studies ; 88. Berlin [u.a.]: Springer; 1991: 45-46.
Springer
1991
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28732
https://pub.uni-bielefeld.de/record/1782007
https://pub.uni-bielefeld.de/download/1782007/2313603
eng
info:eu-repo/semantics/altIdentifier/isbn/3-540-53634-5
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782008
2018-07-24T12:58:02Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
The effects of El Nino on Galápagos pinnipeds
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Dellinger, T.
Trillmich, Fritz
ddc:590
Trillmich F, Dellinger T. The effects of El Nino on Galápagos pinnipeds. In: Trillmich F, ed. <em>Pinnipeds and El Nino</em>. Ecological studies ; 88. Berlin [u.a.]: Springer; 1991: 66-74.
Springer
1991
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28748
https://pub.uni-bielefeld.de/record/1782008
https://pub.uni-bielefeld.de/download/1782008/2313604
eng
info:eu-repo/semantics/altIdentifier/isbn/3-540-53634-5
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782010
2018-07-24T12:58:02Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
The effects of El Nino on pinniped populations in the eastern Pacific
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Ono, K. A.
Costa, D. P.
DeLong, R. L.
Feldkamp, S. D.
Francis, J. M.
Gentry, Roger L.
Heath, C. B.
Le Boeuf, B. J.
Majluf, Patricia
York, A. E.
Trillmich, Fritz
ddc:590
Trillmich F, Ono KA, Costa DP, et al. The effects of El Nino on pinniped populations in the eastern Pacific. In: Trillmich F, ed. <em>Pinnipeds and El Nino</em>. Ecological studies ; 88. Berlin [u.a.]: Springer; 1991: 247-270.
Springer
1991
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28752
https://pub.uni-bielefeld.de/record/1782010
https://pub.uni-bielefeld.de/download/1782010/2313605
eng
info:eu-repo/semantics/altIdentifier/isbn/3-540-53634-5
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782023
2018-07-24T12:59:08Z
book_chapter
doc-type:bookPart
ddc:590
book_chapterFtxt
open_access
The time sequence and magnitude of physical effects of El Nino in the eastern Pacific
Fahrbach, E.
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Arntz, W.
Trillmich, Fritz
ddc:590
Fahrbach E, Trillmich F, Arntz W. The time sequence and magnitude of physical effects of El Nino in the eastern Pacific. In: Trillmich F, ed. <em>Pinnipeds and El Niño</em>. Ecological studies ; 88. Berlin [u.a.]: Springer; 1991: 8-21.
Springer
1991
http://purl.org/coar/resource_type/c_3248
info:eu-repo/semantics/bookPart
doc-type:bookPart
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28789
https://pub.uni-bielefeld.de/record/1782023
https://pub.uni-bielefeld.de/download/1782023/2313607
eng
info:eu-repo/semantics/altIdentifier/isbn/3-540-53634-5
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782026
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Paarzusammenhalt beim Mäusebussard (Buteo buteo L.) im Winter
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Paarzusammenhalt beim Mäusebussard (Buteo buteo L.) im Winter. <em>Die Vogelwelt</em>. 1965;86:60-61.
1965
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28806
https://pub.uni-bielefeld.de/record/1782026
https://pub.uni-bielefeld.de/download/1782026/2313608
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782027
2018-07-24T12:58:02Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Zur Siedlungsdichte von Rotmilan (Milvus milvus) und Mäusebussard (Buteo buteo) bei Hildesheim
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Zur Siedlungsdichte von Rotmilan (Milvus milvus) und Mäusebussard (Buteo buteo) bei Hildesheim. <em>Die Vogelwelt</em>. 1969;90:98-108.
Duncker & Humblot
1969
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28814
https://pub.uni-bielefeld.de/record/1782027
https://pub.uni-bielefeld.de/download/1782027/2313609
deu
info:eu-repo/semantics/altIdentifier/issn/0042-7993
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782028
2018-07-24T12:59:08Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Beobachtungen an Schlafplätzen der Kornweihe (Circus cyaneus) in der Oberrheinebene
Andris, Kurt
Saumer, Fritz
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Andris K, Saumer F, Trillmich F. Beobachtungen an Schlafplätzen der Kornweihe (Circus cyaneus) in der Oberrheinebene. <em>Die Vogelwelt</em>. 1970;91:184-191.
Duncker & Humblot
1970
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28826
https://pub.uni-bielefeld.de/record/1782028
https://pub.uni-bielefeld.de/download/1782028/2313610
deu
info:eu-repo/semantics/altIdentifier/issn/0042-7993
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782031
2018-07-24T12:59:21Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Galápagos sea lions and fur seals
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Galápagos sea lions and fur seals. <em>Noticias de Galápagos</em>. 1979;29:8-14.
1979
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28833
https://pub.uni-bielefeld.de/record/1782031
https://pub.uni-bielefeld.de/download/1782031/2313611
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782032
2018-07-24T12:58:10Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effects of the 1982/83 El Nino on Galápagos fur seals and sea lions
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Effects of the 1982/83 El Nino on Galápagos fur seals and sea lions. <em>Noticias de Galápagos</em>. 1985;42:22-23.
1985
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28846
https://pub.uni-bielefeld.de/record/1782032
https://pub.uni-bielefeld.de/download/1782032/2313612
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782033
2018-07-24T12:59:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Energetic limits to brood care: influences on fertility, and longterm fitness consequences
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Trillmich F. Energetic limits to brood care: influences on fertility, and longterm fitness consequences. <em>Verhandlungen der Deutschen Zoologischen Gesellschaft</em>. 1991;84:79-87.
Biohistoricum
1991
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28859
https://pub.uni-bielefeld.de/record/1782033
https://pub.uni-bielefeld.de/download/1782033/2313613
eng
info:eu-repo/semantics/altIdentifier/issn/0070-4342
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782034
2019-10-15T12:49:32Z
conference_abstract
doc-type:other
ddc:590
conference_abstractFtxt
open_access
El Nino: effects of environmental stress on pinniped populations
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Breckle, Siegmar-Walter
ddc:590
Trillmich F. El Nino: effects of environmental stress on pinniped populations. In: Breckle S-W, ed. <em>Stress - auf allen Ebenen</em>. Bielefelder ökologische Beiträge. Vol 6. Bielefeld: Abt. Ökologie der Univ. ; 1992: 103.
Abt. Ökologie der Univ.
1992
http://purl.org/coar/resource_type/c_c94f
info:eu-repo/semantics/other
doc-type:other
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28865
https://pub.uni-bielefeld.de/record/1782034
https://pub.uni-bielefeld.de/download/1782034/2313614
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1782035
2018-07-24T12:59:08Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Are marine iguanas endanged on islands with introduced predators?
Cayot, Linda J.
Rassmann, Kornelia
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Cayot LJ, Rassmann K, Trillmich F. Are marine iguanas endanged on islands with introduced predators? <em>Noticias de Galápagos</em>. 1994;53:13-15.
1994
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-bipr-28872
https://pub.uni-bielefeld.de/record/1782035
https://pub.uni-bielefeld.de/download/1782035/2313615
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1783805
2018-07-24T12:59:12Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Vocal mother-offspring communication in guinea pigs: females adjust maternal responsiveness to litter size
Kober, Melanie
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Naguib, Marc
ddc:590
Kober M, Trillmich F, Naguib M. Vocal mother-offspring communication in guinea pigs: females adjust maternal responsiveness to litter size. <em>Frontiers in Zoology</em>. 2008;5(1): 13.
Background: In parent-offspring communication, vocal signals are often used to attract attention and offspring might call to induce parental behaviour. In guinea pigs (Cavia aperea f. porcellus) mothers wean larger litters later than small ones, but it is unknown whether this difference depends on processes induced during pregnancy or is influenced post-natally by the number of pups present. We here tested with playback-experiments using pup separation calls whether mothers with cross-fostered large experimental litters (four-pup-litters) were more responsive to offspring calls and maintained responsiveness for longer than mothers with small experimental litters (two-pup-litters). Mothers were tested when two pups were suckling i.e. when both teats were occupied. Results: Mothers of four-pup litters responded stronger to broadcast pup separation calls than those with two-pup litters. Additionally, we tested the mothers' responsiveness to pup separation calls in the absence of their pups on day 8 and 20 of lactation. Mothers of four-pup litters responded stronger and showed no decrease in responsiveness from day 8 to 20, whereas mothers of two-pup litters responded less and decreased responsiveness from day 8 to 20. Mothers of four-pup litters also weaned their pups 5 days later than those of two-pup litters. Conclusion: Measured by their response to pup calls and by time to weaning, guinea pig mothers adjust maternal responsiveness to litter size. This behaviour is likely to be an adaptive strategy in resource allocation during reproduction.
Springer Science and Business Media LLC
2008
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-17838059
https://pub.uni-bielefeld.de/record/1783805
https://pub.uni-bielefeld.de/download/1783805/2314264
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-5-13
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000259404600001
info:eu-repo/semantics/altIdentifier/pmid/18783602
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1929855
2018-08-13T10:14:50Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Stressful Dieting: Nutritional Conditions but Not Compensatory Growth Elevate Corticosterone Levels in Zebra Finch Nestlings and Fledglings
Honarmand, Mariam
Goymann, Wolfgang
Naguib, Marc
ddc:590
Honarmand M, Goymann W, Naguib M. Stressful Dieting: Nutritional Conditions but Not Compensatory Growth Elevate Corticosterone Levels in Zebra Finch Nestlings and Fledglings. <em>PLoS ONE</em>. 2010;5(9): e12930.
Unfavourable conditions throughout the period of parental care can severely affect growth, reproductive performance, and survival. Yet, individuals may be affected differently, depending on the developmental period during which constraints are experienced. Here we tested whether the nestling phase compared to the fledgling phase is more susceptible to nutritional stress by considering biometry, physiology, sexually selected male ornaments and survival using zebra finches (Taeniopygia guttata) as a model species. As nestlings (day 0-17) or fledglings (day 17-35), subjects were raised either on low or high quality food. A low quality diet resulted in significantly elevated baseline corticosterone titres in both nestlings and fledglings. Subjects showed substantial compensatory growth after they had experienced low quality food as nestlings but catch-up growth did neither lead to elevated baseline corticosterone titres nor did we detect long term effects on biometry, male cheek patch, or survival. The compensation for temporally unfavourable environmental conditions reflects substantial phenotypic plasticity and the results show that costs of catch-up growth were not mediated via corticosterone as a physiological correlate of allostatic load. These findings provide new insights into the mechanisms and plasticity with which animals respond to periods of constraints during development as they may occur in a mistiming of breeding.
Public Library of Science (PLoS)
2010
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-19298551
https://pub.uni-bielefeld.de/record/1929855
https://pub.uni-bielefeld.de/download/1929855/2930386
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0012930
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000282210700005
info:eu-repo/semantics/altIdentifier/pmid/20927394
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1588904
2018-07-24T12:58:30Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Progressive colonization and restricted gene flow shape island-dependent population structure in Galapagos marine iguanas (Amblyrhynchus cristatus)
Steinfartz, Sebastian
Glaberman, Scott
Lanterbecq, Deborah
Russello, Michael A.
Rosa, Sabrina
Hanley, Torrance C.
Marquez, Cruz
Snell, Howard L.
Snell, Heidi M.
Gentile, Gabriele
Dell'Olmo, Giacomo
Powell, Alessandro M.
Caccone, Adalgisa
ddc:590
Steinfartz S, Glaberman S, Lanterbecq D, et al. Progressive colonization and restricted gene flow shape island-dependent population structure in Galapagos marine iguanas (Amblyrhynchus cristatus). <em>BMC Evolutionary biology</em>. 2009;9(1):297.
Background: Marine iguanas (Amblyrhynchus cristatus) inhabit the coastlines of large and small islands throughout the Galapagos archipelago, providing a rich system to study the spatial and temporal factors influencing the phylogeographic distribution and population structure of a species. Here, we analyze the microevolution of marine iguanas using the complete mitochondrial control region (CR) as well as 13 microsatellite loci representing more than 1200 individuals from 13 islands. Results: CR data show that marine iguanas occupy three general clades: one that is widely distributed across the northern archipelago, and likely spread from east to west by way of the South Equatorial current, a second that is found mostly on the older eastern and central islands, and a third that is limited to the younger northern and western islands. Generally, the CR haplotype distribution pattern supports the colonization of the archipelago from the older, eastern islands to the younger, western islands. However, there are also signatures of recurrent, historical gene flow between islands after population establishment. Bayesian cluster analysis of microsatellite genotypes indicates the existence of twenty distinct genetic clusters generally following a one-cluster-per-island pattern. However, two well-differentiated clusters were found on the easternmost island of San Cristobal, while nine distinct and highly intermixed clusters were found on youngest, westernmost islands of Isabela and Fernandina. High mtDNA and microsatellite genetic diversity were observed for populations on Isabela and Fernandina that may be the result of a recent population expansion and founder events from multiple sources. Conclusions: While a past genetic study based on pure FST analysis suggested that marine iguana populations display high levels of nuclear ( but not mitochondrial) gene flow due to male-biased dispersal, the results of our sex-biased dispersal tests and the finding of strong genetic differentiation between islands do not support this view. Therefore, our study is a nice example of how recently developed analytical tools such as Bayesian clustering analysis and DNA sequence-based demographic analyses can overcome potential biases introduced by simply relying on FST estimates from markers with different inheritance patterns.
Springer Science + Business Media
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-15889045
https://pub.uni-bielefeld.de/record/1588904
https://pub.uni-bielefeld.de/download/1588904/2311103
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1471-2148-9-297
info:eu-repo/semantics/altIdentifier/issn/1471-2148
info:eu-repo/semantics/altIdentifier/wos/000273842800001
info:eu-repo/semantics/altIdentifier/pmid/20028547
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:1591603
2020-10-13T11:31:57Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Habitat adaptation rather than genetic distance correlates with female preference in fire salamanders (Salamandra salamandra)
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
Junge, Claudia
Weitere, Markus
Steinfartz, Sebastian
ddc:590
Caspers B, Junge C, Weitere M, Steinfartz S. Habitat adaptation rather than genetic distance correlates with female preference in fire salamanders (Salamandra salamandra). <em>Frontiers in Zoology</em>. 2009;6(1):13.
Background: Although some mechanisms of habitat adaptation of conspecific populations have been recently elucidated, the evolution of female preference has rarely been addressed as a force driving habitat adaptation in natural settings. Habitat adaptation of fire salamanders (Salamandra salamandra), as found in Middle Europe (Germany), can be framed in an explicit phylogeographic framework that allows for the evolution of habitat adaptation between distinct populations to be traced. Typically, females of S. salamandra only deposit their larvae in small permanent streams. However, some populations of the western post-glacial recolonization lineage use small temporary ponds as larval habitats. Pond larvae display several habitat-specific adaptations that are absent in stream-adapted larvae. We conducted mate preference tests with females from three distinct German populations in order to determine the influence of habitat adaptation versus neutral genetic distance on female mate choice. Two populations that we tested belong to the western post-glacial recolonization group, but are adapted to either stream or pond habitats. The third population is adapted to streams but represents the eastern recolonization lineage. Results: Despite large genetic distances with F-ST values around 0.5, the stream-adapted females preferred males from the same habitat type regardless of genetic distance. Conversely, pond-adapted females did not prefer males from their own population when compared to stream-adapted individuals of either lineage. Conclusion: A comparative analysis of our data showed that habitat adaptation rather than neutral genetic distance correlates with female preference in these salamanders, and that habitat-dependent female preference of a specific pond-reproducing population may have been lost during adaptation to the novel environmental conditions of ponds.
Springer Science + Business Media
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-15916032
https://pub.uni-bielefeld.de/record/1591603
https://pub.uni-bielefeld.de/download/1591603/2311107
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-6-13
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000268167200001
info:eu-repo/semantics/altIdentifier/pmid/19563652
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2439026
2018-07-24T13:00:36Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Paradigmenwechsel im Verständnis der inneren Uhr
Staiger, Dorothee
ddc:590
Staiger D. Paradigmenwechsel im Verständnis der inneren Uhr. <em>Biologie in unserer Zeit</em>. 2005;35(2):76-77.
Der 24-Stunden-Takt, der uns aufgrund der Erdrotation aufgezwungen wird, spiegelt sich in korpereigenen Rhythmen wie dem regelmaßigen Wechsel von Schlafen und Wachsein oder der tagesperiodischen Veranderung der Korpertemperatur, des Blutdrucks und der Ausschuttung von Hormonen wider. Diese Tagesrhythmen werden nicht direkt durch die Umwelt gesteuert: Wir besitzen ein endogenes Zeitmesssystem, das einen Rhythmus von etwa 24 Stunden erzeugen und aufrechterhalten kann. Im Gegensatz zu fruheren Annahmen scheint es zur Steuerung dieser inneren Rhythmen nicht einen zentralen Schrittmacher zu geben, sondern vielmehr einen Dirigenten, der ein Orchester aus individuellen Uhren in verschiedenen Korperteilen im Takt halt.
WILEY-VCH Verlag
2005
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-24390264
https://pub.uni-bielefeld.de/record/2439026
https://pub.uni-bielefeld.de/download/2439026/2439637
deu
info:eu-repo/semantics/altIdentifier/doi/10.1002/biuz.200590033
info:eu-repo/semantics/altIdentifier/issn/0045-205X
info:eu-repo/semantics/altIdentifier/issn/1521-415X
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2439037
2018-07-24T13:00:23Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Slaves to the rhythm
Rudolf, Fabian
Wehrle, Franziska
Staiger, Dorothee
ddc:590
Rudolf F, Wehrle F, Staiger D. Slaves to the rhythm. <em>The Biochemist</em>. 2004;26:11-13.
2004
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-24390372
https://pub.uni-bielefeld.de/record/2439037
https://pub.uni-bielefeld.de/download/2439037/2439638
eng
info:eu-repo/semantics/altIdentifier/issn/0954-982X
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2439072
2018-07-24T13:01:01Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Wie ist die innere Uhr molekular aufgebaut?
Staiger, Dorothee
ddc:590
Staiger D. Wie ist die innere Uhr molekular aufgebaut? <em>Bielefelder Universitätszeitung</em>. 2003;213:14-15.
Universität Bielefeld
2003
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-24390720
https://pub.uni-bielefeld.de/record/2439072
https://pub.uni-bielefeld.de/download/2439072/2439639
deu
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2494548
2020-10-13T11:38:56Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Are olfactory cues involved in nest recognition in two social species of estrildid finches?
Krause, E. Tobias ; https://orcid.org/0000-0002-8327-3711
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
ddc:590
Krause ET, Caspers B. Are olfactory cues involved in nest recognition in two social species of estrildid finches? <em>PLoS ONE</em>. 2012;7(5): e36615.
Reliably recognizing their own nest provides parents with a necessary skill to invest time and resources efficiently in raising their offspring and thereby maximising their own reproductive success. Studies investigating nest recognition in adult birds have focused mainly on visual cues of the nest or the nest site and acoustic cues of the nestlings. To determine whether adult songbirds also use olfaction for nest recognition, we investigated the use of olfactory nest cues for two estrildid finch species, zebra finches (Taeniopygia guttata) and Bengalese finches (Lonchura striata var. domestica) during the nestling and fledgling phase of their offspring. We found similar behavioural responses to nest odours in both songbird species. Females preferred the odour of their own nest over a control and avoided the foreign conspecific nest scent over a control during the nestling phase of their offspring, but when given the own odour and the foreign conspecific odour simultaneously we did not find a preference for the own nest odour. Males of both species did not show any preferences at all. The behavioural reaction to any nest odour decreased after fledging of the offspring. Our results show that only females show a behavioural response to olfactory nest cues, indicating that the use of olfactory cues for nest recognition seems to be sex-specific and dependent on the developmental stage of the offspring. Although estrildid finches are known to use visual and acoustic cues for nest recognition, the similar behavioural pattern of both species indicates that at least females gain additional information by olfactory nest cues during the nestling phase of their offspring. Thus olfactory cues might be important in general, even in situations in which visual and acoustic cues are known to be sufficient.
Public Library of Science (PLoS)
2012
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-24945480
https://pub.uni-bielefeld.de/record/2494548
https://pub.uni-bielefeld.de/download/2494548/2496880
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0036615
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000305349800093
info:eu-repo/semantics/altIdentifier/pmid/22574196
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395674
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Environment-dependent genetic correlations between development time and body mass in a scorpionfly
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Panorpa cognata
life history evolution
reaction norms
genotype-by-environment interaction
food availability
ddc:590
Engqvist L. Environment-dependent genetic correlations between development time and body mass in a scorpionfly. <em>Zoology</em>. 2007;110(5):344-353.
Development time and body mass at maturation are two important fitness traits fundamental for our understanding of life history theory. Generally, fast development is associated with small adult body mass, as it will take longer to grow large. However, the strength of this trade-off may depend on average food availability, as the potential benefit of long development will depend on the rate of food intake. Here, I report results of a food manipulation experiment during larval development of the scorpionfly Panorpa cognata (Insecta, Mecoptera). Development time showed considerable genetic variation, yet food level had no influence and there was a strong genetic correlation in development time across environments. As expected, larval and adult body weight was significantly affected by food availability. Furthermore, body mass was influenced by a highly significant genotype-by-environment interaction. The reaction norm for body mass in response to food treatment was much stronger in families with long development time compared with rapidly developing genotypes. This effect was accompanied by a shift in the genetic correlation between development time and body size when comparing the two food levels. Specifically, the genetic correlation between body mass and development time changed from being positive at high food levels to a negative genetic correlation at low food levels. These results are consistent with other empirical findings demonstrating a similar shift in genetic correlations between body mass and development time when comparing favourable and unfavourable environmental conditions.
Elsevier BV
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956741
https://pub.uni-bielefeld.de/record/2395674
https://pub.uni-bielefeld.de/download/2395674/2496908
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.zool.2007.07.004
info:eu-repo/semantics/altIdentifier/issn/0944-2006
info:eu-repo/semantics/altIdentifier/wos/000251434400003
info:eu-repo/semantics/altIdentifier/pmid/17888643
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395678
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Females benefit from mating with different males in the scorpionfly Panorpa cognata
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
polyandry
genetic incompatibility
Mecoptera
egg-hatching success
sperm limitation
ddc:590
Engqvist L. Females benefit from mating with different males in the scorpionfly Panorpa cognata. <em>Behavioral Ecology</em>. 2006;17(3):435-440.
The adaptive significance of female polyandry has become a recurrent subject of recent theoretical and empirical research. It has been argued that in addition to direct benefits, such as nuptial gifts or an adequate sperm supply, females may gain genetic benefits from mating with different males. Females of the scorpionfly Panorpa cognata mate with several males during their lifetime. In an experiment designed to rule out any direct nutritional benefit of multiple matings, I found that polyandrous females that mated with two different males achieved a significantly higher egg-hatching success than monandrous females that mated twice with the same male. However, individual males did not trigger the same response in different females as the egg-hatching success of different females that mated with one and same male did not correlate. The results, thus, do not conform to predictions from hypotheses assuming that genetic benefits of polyandry are influenced by the intrinsic genetic quality of males. The results are, however, consistent with the genetic incompatibility hypothesis. Nevertheless, substances from different males transferred during copulation may synergistically affect zygote viability. Furthermore, I discuss why paternity studies can only explicitly test the genetic incompatibility hypothesis if there are a priori expectations of female-male genome compatibilities.
Oxford University Press (OUP)
2006
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956789
https://pub.uni-bielefeld.de/record/2395678
https://pub.uni-bielefeld.de/download/2395678/2496929
eng
info:eu-repo/semantics/altIdentifier/doi/10.1093/beheco/arj046
info:eu-repo/semantics/altIdentifier/issn/1045-2249
info:eu-repo/semantics/altIdentifier/issn/1465-7279
info:eu-repo/semantics/altIdentifier/wos/000236819200015
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395680
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Nuptial food gifts influence female egg production in the scorpionfly Panorpa cognata
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
female fecundity
nuptial food gifts
sexual selection
paternal investment
Mecoptera
mating effort
ddc:590
Engqvist L. Nuptial food gifts influence female egg production in the scorpionfly Panorpa cognata. <em>Ecological Entomology</em>. 2007;32(3):327-332.
1. Before copulation, male Panorpa cognata scorpionflies offer females a salivary secretion, which is consumed by the female during copulation. It has previously been demonstrated that this nuptial food gift functions as mating effort by increasing male attractiveness and by increasing ejaculate transfer during copulation.
2. In this study, the effect of saliva consumption on female reproductive output was investigated, and thus the possibility that nuptial food gifts also serve as paternal investment. The experimental design enabled the effect of nuptial gift consumption to be disentangled from other possible effects of multiple mating or increased copula duration.
3. The results showed that saliva consumption increases female egg production by on average 8% (4.5 eggs) per consumed salivary mass, whereas mean egg weight was not influenced.
4. These results have important implications for the evolution and maintenance of both male nuptial gifts and female polyandry in this and other species.
Wiley
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956806
https://pub.uni-bielefeld.de/record/2395680
https://pub.uni-bielefeld.de/download/2395680/2496913
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2311.2006.00835.x
info:eu-repo/semantics/altIdentifier/issn/0307-6946
info:eu-repo/semantics/altIdentifier/issn/1365-2311
info:eu-repo/semantics/altIdentifier/wos/000247123500012
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395682
2018-07-24T13:01:44Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Sex, food and conflicts: nutrition dependent nuptial feeding and pre-mating struggles in scorpionflies
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
nuptial gifts
alternative mating tactics
resource defence
life history trade-offs
sexual conflict
ddc:590
Engqvist L. Sex, food and conflicts: nutrition dependent nuptial feeding and pre-mating struggles in scorpionflies. <em>Behavioral Ecology and Sociobiology</em>. 2007;61(5):703-710.
Female and male reproductive interests often differ. In species in which matings are accompanied by a transfer of resources valuable for both participants, such as nuptial prey gifts, conflicts may readily occur. Scorpionflies may use alternative mating tactics. One is to offer a prey item (dead arthropod) to females in exchange for mating. This prey gift tactic includes a conflict because a male must decide on whether to offer the gift rather than to fight the female and consume the gift. The outcome may depend on the nutritional status of both males and females. Males may be more willing to give if they themselves are satiated and the condition of the females may influence the payoff from the males' investment. Similarly, females may be more willing to accept food gifts if they are in poor nutritional condition. In this study of the scorpionfly Panorpa cognata, I experimentally manipulated the feeding history of both males and females. I observed the outcome of the direct interactions that followed when males that were holding prey were approached by females. I found that well-fed males offered the food gift sooner than males in poor nutritional condition that fed extensively on the food item before offering. Female condition had no significant influence on whether prey items were offered by males or accepted by females. I also found that well-fed males rarely searched for prey to pursue the prey gift tactic in courtship. Thus, the prey tactic does not seem to be the males' first option.
Springer Science and Business Media LLC
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956824
https://pub.uni-bielefeld.de/record/2395682
https://pub.uni-bielefeld.de/download/2395682/2496917
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00265-006-0300-3
info:eu-repo/semantics/altIdentifier/issn/0340-5443
info:eu-repo/semantics/altIdentifier/issn/1432-0762
info:eu-repo/semantics/altIdentifier/wos/000244684500006
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395684
2018-07-24T13:00:54Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate?
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
cryptic female choice
panorpa
sperm competition
postcopulatory sexual selection
sexual conflict
nuptial food gifts
mecoptera
ddc:590
Engqvist L. Nuptial gift consumption influences female remating in a scorpionfly: male or female control of mating rate? <em>Evolutionary Ecology</em>. 2007;21(1):49-61.
In the scorpionfly Panorpa cognata, males provide females with saliva secretions as nuptial food gifts. Consequently, females derive material benefits and possibly also genetic benefits from multiple matings. Females therefore generally should have a high motivation to remate. Males, on the other hand, do not share this interest, which will generate a sexual conflict over remating interval, possibly leading to male adaptations that prevent females from remating with other males. In this study, I found that mated females were less prone to copulate than virgin females, despite female benefits of multiple matings. Further, I found that the remating interval was significantly longer if the first copulation was long compared to shorter matings. This effect does not entirely depend on copulation duration per se, but on the amount of saliva, that a female is consuming during copulation. These results suggest a mating-induced refractory period and can be interpreted as male manipulation of female remating behaviour mediated through substances in the nuptial gift. Alternatively, receiving large nuptial gifts may decrease the prospective direct fitness benefits from further copulations, and thus change optimal female remating rate. Furthermore, gift size has been shown to correlate with male nutritional condition, which may be an indicator of male genetic quality. Females may therefore benefit indirectly by not remating following copulations involving large saliva gifts. In this scenario, female remating interval would be an effect of cryptic female choice.
Springer Science and Business Media LLC
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956840
https://pub.uni-bielefeld.de/record/2395684
https://pub.uni-bielefeld.de/download/2395684/2496915
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10682-006-9123-y
info:eu-repo/semantics/altIdentifier/issn/0269-7653
info:eu-repo/semantics/altIdentifier/issn/1573-8477
info:eu-repo/semantics/altIdentifier/wos/000243905200004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395686
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Male scorpionflies assess the amount of rival sperm transferred by females' previous mates
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
strategic sperm allocation
Mecoptera
ejaculate size
sperm competition
nuptial gifts
ddc:590
Engqvist L. Male scorpionflies assess the amount of rival sperm transferred by females' previous mates. <em>Evolution</em>. 2007;61(6):1489-1494.
Theory predicts that when sperm compete numerically, selection will favor males who vary the number of sperm they transfer with the immediate level of sperm competition. In this study, I measured male mating investment in response to both female mating status (virgin vs. mated) and the number of foreign sperm stored by females in a previous mating in the scorpionfly Panorpa cognata. Female sperm storage was manipulated by interrupting copulations at different time points. Female mating status did not significantly influence male mating investment, but resource-limited males invested strategically in relation to the amount of sperm stored by females in a previous mating. I found continuously decreasing male investment in response to increasing amounts of competing sperm. These results demonstrate an unprecedented male ability to assess the number of sperm stored by females. As a result, males are capable of an extraordinarily fine-tuned reaction to the intensity of sperm competition.
Wiley
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956864
https://pub.uni-bielefeld.de/record/2395686
https://pub.uni-bielefeld.de/download/2395686/2496911
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1558-5646.2007.00107.x
info:eu-repo/semantics/altIdentifier/issn/0014-3820
info:eu-repo/semantics/altIdentifier/issn/1558-5646
info:eu-repo/semantics/altIdentifier/wos/000247125100019
info:eu-repo/semantics/altIdentifier/pmid/17542855
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395688
2018-07-24T13:00:32Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Genetic variance and genotype reaction norms in response to larval food manipulation for a trait important in scorpionfly sperm competition.
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
phenotypic plasticity
sperm competition
genotype x environment interactions
Mecoptera
ejaculate size
ddc:590
Engqvist L. Genetic variance and genotype reaction norms in response to larval food manipulation for a trait important in scorpionfly sperm competition. <em>Functional Ecology</em>. 2008;22(1):070915213639001-???
Sperm competition is an important attribute of many mating systems. Examining the genetic and environmental factors influencing male sperm competition success is essential in order to understand variation in reproductive success.
In the scorpionfly Panorpa cognata, male success in sperm competition is influenced by the number of sperm transferred during copulation. This will be determined by copulation duration and the sperm transfer rate of males. Sperm transfer rate is a trait which shows considerable phenotypic variance.
Here, I use a full-sib split-brood design in order to investigate both to what extent this trait is heritable and the influence of larval food availability on male sperm transfer rate.
The results demonstrate considerable genetic variance underlying the phenotypic expression of sperm transfer rate. Heritability estimates were slightly larger, but not significantly so, for offspring reared at low food availability.
In contrast, there was no straightforward evidence that larval food availability had an effect on the sperm transfer rate of males. However, a significant family x treatment interaction provided evidence of a genotype x environment effect on male sperm competitive ability. These results demonstrate different reaction norms for sperm transfer rate in response to larval treatment for individuals with different genetic background.
Wiley
2008
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956884
https://pub.uni-bielefeld.de/record/2395688
https://pub.uni-bielefeld.de/download/2395688/2496637
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2435.2007.01336.x
info:eu-repo/semantics/altIdentifier/issn/0269-8463
info:eu-repo/semantics/altIdentifier/issn/1365-2435
info:eu-repo/semantics/altIdentifier/wos/000252443600017
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395690
2018-07-24T13:00:32Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Should I stay or should I go? Condition- and status-dependent courtship decisions in the scorpionfly Panorpa cognata
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
ddc:590
Engqvist L. Should I stay or should I go? Condition- and status-dependent courtship decisions in the scorpionfly Panorpa cognata. <em>Animal Behaviour</em>. 2009;78(2):491-497.
The occurrence of prolonged courtship behaviour in many animal species is a well-known phenomenon. The duration of courtship may be influenced by both females and males, often with different interests. In the scorpionfly Panorpa cognata, males offer a salivary secretion as a nuptial gift before copulation. However, males do not immediately initiate copulation by the production of the salivary mass. Instead pairs usually engage in prolonged courtship interactions. Yet the duration of courtship is highly variable, ranging between a few minutes and several hours. Furthermore, courtship does not always result in copulation; instead females often terminate courtship and abandon the male. The duration and outcome of courtship are likely to be influenced by factors such as body condition and female mating history, because they might influence individual attractiveness and motivation to mate. I examined to what extent these factors influence both male and female courtship decisions. Mated females were less keen to remain in courtship for long and abandoned males sooner than virgin females. Yet, male mating behaviour was unaffected by female mating status. Counterintuitively, females in poor condition interrupted courtship sooner with increasing body weight of their male partner. In addition, heavier males initiated copulations sooner than males in poorer condition. However, this effect was evident only in interactions with females in poor condition. A possible interpretation of these results is that males attempt to prevent females in poor condition from leaving prior to copulation by initiating copulation faster.
Elsevier BV
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956906
https://pub.uni-bielefeld.de/record/2395690
https://pub.uni-bielefeld.de/download/2395690/2496627
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.anbehav.2009.05.021
info:eu-repo/semantics/altIdentifier/issn/0003-3472
info:eu-repo/semantics/altIdentifier/wos/000268902900034
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395692
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Male attractiveness is negatively genetically associated with investment in copulations
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
sperm competition
life history trade-offs
Panorpa
alternative mating strategies
nuptial gifts
sexual selection
ddc:590
Engqvist L. Male attractiveness is negatively genetically associated with investment in copulations. <em>Behavioral Ecology</em>. 2011;22(2):345-349.
In species with high male mating effort, there is a trade-off between mating effort spent in a current mating and resources left for future matings. Males are therefore expected to allocate resources prudently across successive matings. Attractive males that will have a high mating success might therefore be forced to decrease mating investment in comparison to less attractive males. Furthermore, if there is genetic variation in attractiveness, one might expect to find a negative genetic correlation between attractiveness and mating investment. Here this genetic prediction is tested using the scorpionfly Panorpa cognata (Insecta: Mecoptera). In this species males offer costly salivary secretions as nuptial gifts to females. By producing large secretions males increase copulation duration and sperm transfer, thus gaining an advantage in sperm competition. I used a full-sib breeding design and found that both attractiveness and mating investment showed considerable heritability. Most importantly, there was a significant negative genetic correlation between attractiveness and mating investment: in families with attractive individuals, males produced smaller salivary secretions than in families with less attractive males. The results thus demonstrate an important evolutionary trade-off between mating success and sperm competition success.
Oxford University Press (OUP)
2011
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956928
https://pub.uni-bielefeld.de/record/2395692
https://pub.uni-bielefeld.de/download/2395692/2496606
eng
info:eu-repo/semantics/altIdentifier/doi/10.1093/beheco/arq211
info:eu-repo/semantics/altIdentifier/issn/1045-2249
info:eu-repo/semantics/altIdentifier/issn/1465-7279
info:eu-repo/semantics/altIdentifier/wos/000289299500022
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395694
2018-07-24T13:01:44Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Sperm transfer and paternity in the scorpionfly Panorpa cognata: large variance in traits favoured by postcopulatory episodes of sexual selection
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Dekomien, Gabriele
Lippmann, Tania
Epplen, Jörg T.
Sauer, Klaus Peter
sperm precedence
cryptic female choice
copulation duration
fair raffle
mecoptera
sperm competition
microsatellites
ddc:590
Engqvist L, Dekomien G, Lippmann T, Epplen JT, Sauer KP. Sperm transfer and paternity in the scorpionfly Panorpa cognata: large variance in traits favoured by postcopulatory episodes of sexual selection. <em>Evolutionary Ecology</em>. 2007;21(6):801-816.
Post-copulatory episodes of sexual selection can be a powerful selective force influencing the reproductive success of males. In order to understand variation in male fertilisation success, we first need to consider the pattern of sperm utilisation by females following matings with more than one male. Second, we need to study those traits responsible for male success in sperm competition. Here we study both male sperm transfer characteristics as well as offspring paternity of females mated to two males in the scorpionfly Panorpa cognata. By repeatedly mating males to virgin females and interrupting copulation at defined time points, we found for all males that sperm transfer set off after approximately 40 min. During the remaining copulation, sperm transfer of individual males was continuous and with constant rate. Yet the rate of sperm transfer differed between individual males from about one sperm per minute to more than eight sperm per minute for the most successful males. In addition, we measured the fertilisation success in sperm competition of males with known sperm transfer capability. The relative number of sperm transferred by males during copulation, estimated from copulation duration and the males' individual sperm transfer rate, explained a large proportion of variation in offspring paternity. The mode of sperm competition in this species, thus, conforms largely to a fair raffle following complete mixing of sperm prior to fertilisation. Hence, male differences in both the ability to copulate for long and of rapid sperm transfer will translate directly into differences in reproductive success.
Springer Science and Business Media LLC
2007
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23956947
https://pub.uni-bielefeld.de/record/2395694
https://pub.uni-bielefeld.de/download/2395694/2496923
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10682-006-9152-6
info:eu-repo/semantics/altIdentifier/issn/0269-7653
info:eu-repo/semantics/altIdentifier/issn/1573-8477
info:eu-repo/semantics/altIdentifier/wos/000249918000007
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395713
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Pitfalls in experiments testing predictions from sperm competition theory
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Reinhold, Klaus
sperm allocation
sperm competition risk
sexual selection
ejaculate size
sperm competition intensity
ddc:590
Engqvist L, Reinhold K. Pitfalls in experiments testing predictions from sperm competition theory. <em>Journal of Evolutionary Biology</em>. 2005;18(1):116-123.
As females of many species mate with more than one male, ejaculates often face competition from the sperm of other males. In recent years, numerous papers have been published on theoretical predictions of evolutionary, behavioural and physiological responses to variation in the strength of sperm competition (SC). These theoretical predictions have also been extensively tested. However, although predictions from SC theory are relatively straightforward, extra caution has to be paid in the design of experiments testing them. One difficulty is for example to disentangle immediate and mean SC risk and intensity. Without carefully designed experiments, it is also very easy to simultaneously increase SC risk and the probability of intense SC - a situation for which we currently have no clear predictions, as the theoretical models to date only assume variation in either SC risk or intensity. In this paper, we discuss these and some other pitfalls related to manipulations of SC risk and intensity and suggest how to avoid them.
Wiley
2005
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957134
https://pub.uni-bielefeld.de/record/2395713
https://pub.uni-bielefeld.de/download/2395713/2496933
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1420-9101.2004.00792.x
info:eu-repo/semantics/altIdentifier/issn/1010-061X
info:eu-repo/semantics/altIdentifier/issn/1420-9101
info:eu-repo/semantics/altIdentifier/wos/000226400000012
info:eu-repo/semantics/altIdentifier/pmid/15669967
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395722
2018-07-24T13:00:32Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Strategic male mating effort and cryptic male choice in a scorpionfly
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
nuptial gift
Panorpa
sexual selection
sperm competition
copulation duration
ddc:590
Engqvist L, Sauer KP. Strategic male mating effort and cryptic male choice in a scorpionfly. <em>Proceedings of the Royal Society B</em>. 2001;268(1468):729-735.
In animal species with high male mating effort, males often find themselves in a dilemma: by increasing their mating effort, the gain from each copulation increases but simultaneously reduces available resources and, thus, the opportunity for future copulations. Therefore, we expect males to spend less reproductive resources on matings that provide low reproductive potential, thereby saving resources for future copulations, possibly with high-quality females, a sort of cryptic male choice. However, the strength of the trade-off between nvestment in a current mating and resources available for future matings must not be the same for all males. Males with relatively high mating costs should allocate their limited resources more cautiously than males with more plentiful resources. Here, we examine this prediction in the scorpionfly Panorpa cognata. Prior to copulation, males produce a large salivary mass on which females feed during copulation. We show that the production of larger salivary masses leads to longer copulations. Moreover, the size of the salivary gland and salivary mass increases with increasing male condition. However, males in poor condition make a relatively higher mating investment than males in good condition. We therefore expect male condition to influence cryptic male choice. In accordance with our hypothesis, only males in poor condition choose cryptically, producing larger salivary masses in copulations with females of high fecundity.
The Royal Society
2001
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957222
https://pub.uni-bielefeld.de/record/2395722
https://pub.uni-bielefeld.de/download/2395722/2496961
eng
info:eu-repo/semantics/altIdentifier/doi/10.1098/rspb.2000.1423
info:eu-repo/semantics/altIdentifier/issn/0962-8452
info:eu-repo/semantics/altIdentifier/issn/1471-2954
info:eu-repo/semantics/altIdentifier/wos/000168103900009
info:eu-repo/semantics/altIdentifier/pmid/11321062
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395725
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Amorous scorpionflies: causes and consequences of the long pairing prelude of Panorpa cognata
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
ddc:590
Engqvist L, Sauer KP. Amorous scorpionflies: causes and consequences of the long pairing prelude of Panorpa cognata. <em>Animal Behaviour</em>. 2002;63(4):667-675.
The scorpionfly Panorpa cognata has a prolonged premating period. After the male attracts a female, there is usually a long delay, from a few minutes to almost 7 h, before the male initiates copulation by secreting a salivary mass. In our experiments, we manipulated the amount of food, and hence the condition, of males and then measured their premating duration. The premating duration was strongly influenced by male nutrient availability and, consequently, male mating resource limitation. Males with ample resource availability, that is with large salivary glands, initiated copulations faster than males with limited resources. In addition, premating duration decreased with increasing male age. The secretion of a salivary mass was more likely to result in a successful copulation if males delayed copulation. When males initiated copulation soon after attracting a mate, nuptial gift offering often failed because of interruption by other scorpionflies or female rejection. Since the value of each invested salivary mass is high for males with limited resources, we suggest that these males invest prudently: to enhance the probability of a return on their investment, they delay secreting the salivary mass until they are confident that females are motivated to mate. Furthermore, with this strategy, males enhance the likelihood of copulating in a sheltered location, where they are unlikely to be interrupted by intruders. Alternative hypotheses are that males in poor condition have more difficulty in persuading females or that males with small salivary glands need longer to produce the salivary mass.
Elsevier BV
2002
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957258
https://pub.uni-bielefeld.de/record/2395725
https://pub.uni-bielefeld.de/download/2395725/2496955
eng
info:eu-repo/semantics/altIdentifier/doi/10.1006/anbe.2001.1947
info:eu-repo/semantics/altIdentifier/issn/0003-3472
info:eu-repo/semantics/altIdentifier/wos/000175768800004
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395728
2018-07-24T13:00:54Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
A life history perspective on strategic mating effort in male scorpionflies
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
scorpionflies
sperm competition
resource allocation
Panorpa
mating investment
sexual selection
nuptial gifts
ddc:590
Engqvist L, Sauer KP. A life history perspective on strategic mating effort in male scorpionflies. <em>Behavioral Ecology</em>. 2002;13(5):632-636.
In species with high male mating effort, there is a trade-off between mating effort spent in a current mating and resources left for future matings. Consequently, to maximize their reproductive success, males have to invest strategically, saving resources in matings with low reproductive gain for future, more valuable matings. However, as males age, the expected future reproductive success constantly declines. Thus, the importance of resource rationing may drastically change during a lifetime. Males of the scorpionfly Panorpa cognata offer females a costly nuptial gift before copulation, which functions as male mating effort. Resources for the production of these salivary masses are severely limited for males in poor condition. We found that males invested more in copulations with high-quality females than in copulations with low-quality females. However, males ceased to discriminate as they became older. Old males, with a relative small number of expected future matings, did not invest differentially in copulations with high- versus low-quality females. In copulations with low-quality females, males invested more in late than in initial matings, whereas in matings with high-quality females, time of mating had no influence on mating effort. These results imply that males adaptively change their resource allocation strategy during the course of the season. Initial matings seem to be characterized by male prudence; in later matings, males seem to adopt a more opportunistic mating strategy.
Oxford University Press (OUP)
2002
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957280
https://pub.uni-bielefeld.de/record/2395728
https://pub.uni-bielefeld.de/download/2395728/2496952
eng
info:eu-repo/semantics/altIdentifier/doi/10.1093/beheco/13.5.632
info:eu-repo/semantics/altIdentifier/issn/1045-2249
info:eu-repo/semantics/altIdentifier/issn/1465-7279
info:eu-repo/semantics/altIdentifier/wos/000178001500007
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395731
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Determinants of sperm transfer in the scorpionfly Panorpa cognata: male variation, female condition and copulation duration
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
copulation duration
strategic mating effort
post-copulatory sexual selection
sperm competition
Mecoptera
male choice
ejaculate size
cryptic mate choice
ddc:590
Engqvist L, Sauer KP. Determinants of sperm transfer in the scorpionfly Panorpa cognata: male variation, female condition and copulation duration. <em>Journal of Evolutionary Biology</em>. 2003;16(6):1196-1204.
Recent studies suggest that sperm production and transfer may have significant costs to males. Male sperm investment into a current copulation may therefore influence resources available for future matings, which selects for male strategic mating investment. In addition, females may also benefit from actively or passively altering the number of sperm transferred by males. In the scorpionfly Panorpa cognata, the number of sperm transferred during copulation depended on copulation duration and males in good condition (residual weight) copulated longer and also transferred more sperm. Moreover, sperm transferred and stored per unit time was higher in copulations with females in good condition than in copulations with females in poor condition. Males varied greatly and consistently in their sperm transfer rate, indicative of costs associated with this trait. The duration of the pairing prelude also varied between males and correlated negatively with the male's sperm transfer rate, but no other male character correlated significantly with male sperm transfer rate. The results are consistent with strategic mating effort but sperm transfer could also be facilitated by the physical size of females and/or females in good condition may be more cooperative during sperm transfer.
Wiley
2003
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957318
https://pub.uni-bielefeld.de/record/2395731
https://pub.uni-bielefeld.de/download/2395731/2496946
eng
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1420-9101.2003.00613.x
info:eu-repo/semantics/altIdentifier/issn/1010-061X
info:eu-repo/semantics/altIdentifier/issn/1420-9101
info:eu-repo/semantics/altIdentifier/wos/000185988000014
info:eu-repo/semantics/altIdentifier/pmid/14640411
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395734
2018-07-24T13:00:32Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Influence of nutrition on courtship and mating in the scorpionfly Panorpa cognata
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
ddc:590
Engqvist L, Sauer KP. Influence of nutrition on courtship and mating in the scorpionfly Panorpa cognata. <em>Ethology</em>. 2003;109(11):911-928.
Scorpionflies have been used as model organisms for the study of alternative male mating tactics as well as sexual conflict and coercive mating. Here we describe the courtship and mating behaviour of the scorpionfly Panorpa cognata at different levels of nutrition. Alternative mating tactics in scorpionflies involve nuptial food gifts, and we expected an effect of nutrient availability and male individual condition on the relative frequency of these mating tactics. Subsequent to female attraction by means of male pheromonal emission (calling) and a conspicuous pairing prelude, the majority of matings were initiated by male secretion of one relatively large salivary mass on which females feed during copulation. Usually, males produced only a single salivary mass per mating, and the copulation was terminated after the female had consumed the salivary mass. Alternatively, in 40% of the copulations, males offered females a dead arthropod as nuptial gift. However, these matings were neither preceded by male calling nor by the pairing prelude. Copulations with no gifts were extremely rare, and forced copulations were absent. The manipulation of the clamp-like notal organ used by male scorpionflies in coercive matings had no effect on the duration of copulation, suggesting that P. cognata males are not able to enforce longer matings. Copulations involving salivary mass gifts were significantly longer than copulations with prey provided as gifts. Although contrary to our expectations, nutrition had no effect on the relative frequency of the different male mating tactics, it had several effects on courtship and mating. First, well-fed individuals copulated significantly more often, both with prey and salivary secretions, than individuals with limited nutrient resources available. This was true for both sexes, although the effect was stronger for males. Higher availability of nutrients decreased the time until male and female sexual maturity and increased male calling duration per day. Furthermore, high nutrient availability decreased the duration of the pairing prelude, and consequently pairs started copulating earlier at night in the high nutrient treatment.
Wiley
2003
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957345
https://pub.uni-bielefeld.de/record/2395734
https://pub.uni-bielefeld.de/download/2395734/2496949
eng
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1439-0310.2003.00937.x
info:eu-repo/semantics/altIdentifier/issn/0179-1613
info:eu-repo/semantics/altIdentifier/issn/1439-0310
info:eu-repo/semantics/altIdentifier/wos/000186501000005
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395737
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Nutrition- and sex-dependent utilization of body resources in relation to reproduction in a scorpionfly.
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
Engels, Sierk
insect flight
oogenesis-flight syndrome
life history
Panorpa
nuptial gifts
: flight muscles
ddc:590
Engqvist L, Sauer KP, Engels S. Nutrition- and sex-dependent utilization of body resources in relation to reproduction in a scorpionfly. <em>Biological Journal of the Linnean Society</em>. 2011;102(1):199-207.
Reproduction often comes at a cost of a reduction in body functions. In order to enhance their reproductive output, some insect species degenerate their thoracic muscles, typically resulting in reduced flight ability. From a life-history trade-off perspective, we expect the importance of body resource utilization to be amplified both with increased reproductive expenditure and with increased resource limitation. In this study, we measured age-related changes in thorax weight, as a measure of flight muscle size, during a major part of the adult lifespan in males and females of the scorpionfly Panorpa vulgaris. The aim of the study was twofold: first to investigate whether scorpionflies have the potential to degenerate their flight muscles; second, and more importantly, to determine whether the magnitude of flight muscle degeneration is a plastic response in relation to resource availability, and if it differs between the sexes. The results clearly demonstrate that food availability does influence investment in flight muscle development. The build-up of the thoracic muscles was strongly influenced by nutrient availability. Furthermore, the age-related decrease in thorax weight was significantly different for males and females. Only females showed a strong age-dependent decrease in thorax weight, indicative of muscle degeneration, yet no difference between food treatments was detected. For males, there was no significant directional change in thorax weight. Nevertheless, with increasing age, the difference in thorax weight between food treatments increased significantly.
Wiley-Blackwell
2011
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957375
https://pub.uni-bielefeld.de/record/2395737
https://pub.uni-bielefeld.de/download/2395737/2496608
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8312.2010.01560.x
info:eu-repo/semantics/altIdentifier/issn/0024-4066
info:eu-repo/semantics/altIdentifier/wos/000285305000016
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395741
2018-07-24T13:00:32Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Suboptimal patch and plant choice by an ovipositing monophagous moth - An insurance against bad weather?
Förare, Jonas
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
preference
lepidoptera
hostplants
consequences
quality
pierid butterflies
Cabbage butterflies
habitat suitability
environment
populations
ddc:590
Förare J, Engqvist L. Suboptimal patch and plant choice by an ovipositing monophagous moth - An insurance against bad weather? <em>Oikos</em>. 1996;77(2):301-308.
The egg distribution of the monophagous noctuid moth Abrostola asclepiadis was related to the characteristics of host plant patches and individual plant shoots. Both the density and size of egg batches were greater in small, shaded host plant patches than in large, sun-exposed ones, and egg batches were larger on short host plants than on tall ones. We examined the consequences of this egglaying 'preference' on offspring performance. In the field, there was no difference in either egg or larval mortality between patches differing in degree of sun exposure or size. Nor did mortality differ between batches on small plants and those on taller plants. Furthermore, neither larval growth rate nor pupal size showed any relation to egg-laying 'preferences'. Larvae fed foliage from small, shaded plants ended up smaller than larvae fed foliage from large, sun-exposed plants, but the development rates of the two groups were similar. There was no difference in weight or rate of development between larvae fed foliage from large, sun- exposed plants and those fed foliage from large, shaded plants. Hence, neither the 'preference' for certain patches nor that for certain host plant individuals seemed to be related to larval performance. Reasons for the tendency to deposit large egg batches on small plants remain obscure. However, there is an alternative explanation as to why more eggs were laid in shaded patches, namely that these patches are less subjected to drought, and host plant wilting is therefore less common. An 18-yr record shows that droughts intermittently cause severe drying out of plants in sun-exposed, rocky positions.
0030-1299
1996
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957410
https://pub.uni-bielefeld.de/record/2395741
https://pub.uni-bielefeld.de/download/2395741/2496978
eng
info:eu-repo/semantics/altIdentifier/doi/10.2307/3546069
info:eu-repo/semantics/altIdentifier/issn/0030-1299
info:eu-repo/semantics/altIdentifier/wos/A1996VW66000016
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395744
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Costly plastic morphological responses to predator specific odour cues in three-spined sticklebacks (Gasterosteus aculeatus)
Frommen, Joachim G
Herder, Fabian
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Mehlis, Marion
Bakker, Theo. C. M.
Thünken, Timo
Schreckstoff
Phenotypic plasticity
Predation risk
Speciation
Induced defences
Reaction norm
ddc:590
Frommen JG, Herder F, Engqvist L, Mehlis M, Bakker TCM, Thünken T. Costly plastic morphological responses to predator specific odour cues in three-spined sticklebacks (Gasterosteus aculeatus). <em>Evolutionary Ecology</em>. 2011;25(3):641-656.
Predation risk is one of the major forces affecting phenotypic variation among and within animal populations. While fixed anti-predator morphologies are favoured when predation level is consistently high, plastic morphological responses are advantageous when predation risk is changing temporarily, spatially, or qualitatively. Three-spined sticklebacks (Gasterosteus aculeatus) are well known for their substantial variability in morphology, including defensive traits. Part of this variation might be due to phenotypic plasticity. However, little is known about sticklebacks' plastic ability to react morphologically to changing risks of predation and about the proximate cues involved. Using a split-clutch design we show that odour of a predatory fish induces morphological changes in sticklebacks. Under predation risk, i.e., when exposed to odour of a predator, fish grew faster and developed a different morphology, compared to fish reared under low predation risk, i.e., exposed to odour of a non-predatory fish, or in a fish-free environment. However, fast growing comes at cost of increased body asymmetries suggesting developmental constraints. The results indicate that sticklebacks are able to distinguish between predatory and non-predatory fishes by olfactory cues alone. As fishes were fed on invertebrates, this reaction was not induced by chemical cues of digested conspecifics, but rather by predator cues themselves. Further, the results show that variation in body morphology in sticklebacks has not only a strong genetical component, but is also based on plastic responses to different environments, in our case different predation pressures, thus opening new questions for this model species in ecology and evolution.
Springer Science + Business Media
2011
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957444
https://pub.uni-bielefeld.de/record/2395744
https://pub.uni-bielefeld.de/download/2395744/2496612
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10682-010-9454-6
info:eu-repo/semantics/altIdentifier/issn/0269-7653
info:eu-repo/semantics/altIdentifier/issn/1573-8477
info:eu-repo/semantics/altIdentifier/wos/000289257900007
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395755
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
To eat or not to eat: egg-based assessment of paternity triggers fine-tuned decisions about filial cannibalism
Mehlis, Marion
Bakker, Theo C. M.
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Frommen, Joachim G.
three-spined stickleback
aggression
parent-offspring conflict
kin recognition
oophagy
brood-care
ddc:590
Mehlis M, Bakker TCM, Engqvist L, Frommen JG. To eat or not to eat: egg-based assessment of paternity triggers fine-tuned decisions about filial cannibalism. <em>Proceedings of the Royal Society B</em>. 2010;277(1694):2627-2635.
Filial cannibalism occurs in many animal species ranging from insects to mammals, and is especially well described in teleost fishes. Numerous causes may lead to this behaviour, e. g. certainty of paternity. However, the cues males use to assess their paternity often remain unknown. One possible way to differentiate between own and foreign offspring is by using egg cues. Nevertheless, in egg-laying species, evidence for this is still scarce. In this study, male three-spined sticklebacks (Gasterosteus aculeatus), a fish with paternal care in which sneaking as well as filial cannibalism is common, were allowed to care for manipulated nests that contained different percentages of own fertilized eggs. After 7 days, embryo survival was determined. Furthermore, brood-caring as well as aggressive behaviour was measured daily. Clutches containing a higher proportion of foreign eggs were more likely to be completely cannibalized than clutches containing a lower proportion of foreign eggs, particularly when the clutch was laid early in the breeding season. However, the behavioural observations revealed no influence of paternity. The results show that paternity triggers filial cannibalism in sticklebacks and that males are able to evaluate their paternity using egg cues alone.
The Royal Society
2010
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957559
https://pub.uni-bielefeld.de/record/2395755
https://pub.uni-bielefeld.de/download/2395755/2496622
eng
info:eu-repo/semantics/altIdentifier/doi/10.1098/rspb.2010.0234
info:eu-repo/semantics/altIdentifier/issn/0962-8452
info:eu-repo/semantics/altIdentifier/issn/1471-2954
info:eu-repo/semantics/altIdentifier/wos/000280320900006
info:eu-repo/semantics/altIdentifier/pmid/20410042
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395775
2018-07-24T13:01:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Cryptic male choice: sperm allocation strategies when female quality varies
Reinhold, Klaus
Kurtz, Joachim
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
genetic algorithm
sexual selection
cryptic mate choice
sperm competition
evolutionary stable strategy
ddc:590
Reinhold K, Kurtz J, Engqvist L. Cryptic male choice: sperm allocation strategies when female quality varies. <em>Journal of Evolutionary Biology</em>. 2002;15(2):201-209.
We examined evolutionary stable sperm allocation and included stochastic variation in male mating frequency, not included in previous models examining sperm allocation strategies. We assumed sperm mixing and variation in female quality and used a genetic algorithm to analyse the evolution of male sperm allocation, Our results show that males should invest more sperm in initial copulations than in subsequent copulations as a male might fail to mate again. The inclusion of variation in female fecundity had no influence on the evolutionary stable sperm allocation strategy if males were unable to recognize female quality. if males were assumed to allocate sperm in response to female quality, the proportion of sperm allocated was positively correlated with female quality. Moreover, with increasing variance in female quality, males conserved more sperm for later copulations. Literature data on sperm allocation from diverse taxa show a good fit with the predictions given by our model.
Wiley
2002
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957754
https://pub.uni-bielefeld.de/record/2395775
https://pub.uni-bielefeld.de/download/2395775/2496958
eng
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1420-9101.2002.00390.x
info:eu-repo/semantics/altIdentifier/issn/1010-061X
info:eu-repo/semantics/altIdentifier/wos/000174709000003
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2395779
2018-07-24T13:01:05Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Phenotypic plasticity in sperm traits in scorpionflies (Mecoptera: Panorpidae): consequences of larval history and seasonality on sperm length and sperm transfer
Vermeulen, Andreas
Engels, Sierk
Engqvist, Leif ; https://orcid.org/0000-0002-9434-7130
Sauer, Klaus Peter
sperm competition
spermatogenesis
ejaculate expenditure
Mecoptera
Panorpidae
sperm size
larval rearing density
ddc:590
Vermeulen A, Engels S, Engqvist L, Sauer KP. Phenotypic plasticity in sperm traits in scorpionflies (Mecoptera: Panorpidae): consequences of larval history and seasonality on sperm length and sperm transfer. <em>European Journal of Entomology</em>. 2009;106:347-352.
We examined effects of seasonality, larval food availability and larval rearing density on sperm length, sperm transfer rates and body size in the bivoltine scorpionfly Panorpa vulgaris. Males of the first annual generation were larger and had larger sperm. Comparing individuals of two summer generations showed that adult males resulting from group bred, ad libitum fed larvae were larger but had smaller sperm than males resulting from singly kept, food deprived larvae. Thus, sperm size is not a simple function of body size. Instead, we suggest that sperm size modification was caused by varying rearing densities. Group bred individuals produced smaller sperm but transferred at higher rate. This indicates a trade-off between sperm number and sperm size as predicted by evolutionary models of sperm production. Given the strong influence of larval history in our present work, we recommend that future studies investigating the consequences of varying sperm competition risk or intensity on male gametic strategies should also control for larval history in order to avoid distorting effects.
Biology Centre, AS CR
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-23957792
https://pub.uni-bielefeld.de/record/2395779
https://pub.uni-bielefeld.de/download/2395779/2496629
eng
info:eu-repo/semantics/altIdentifier/doi/10.14411/eje.2009.042
info:eu-repo/semantics/altIdentifier/issn/1210-5759
info:eu-repo/semantics/altIdentifier/issn/1802-8829
info:eu-repo/semantics/altIdentifier/wos/000268225200003
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2404335
2018-07-24T13:01:07Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Wie beeinflusst Schülermitbestimmung im Biologieunterricht intrinsische Motivation und Wissenserwerb?
Bätz, Katrin
Beck, Ludmilla
Kramer, Laura
Niestradt, Jessica
Wilde, Matthias ; https://orcid.org/0000-0002-1630-3263
ddc:590
Bätz K, Beck L, Kramer L, Niestradt J, Wilde M. Wie beeinflusst Schülermitbestimmung im Biologieunterricht intrinsische Motivation und Wissenserwerb? <em>Zeitschrift für Didaktik der Naturwissenschaften</em>. 2009;15:307-323.
Selbststeuerung gilt für schulisches Lernen als wichtiger Einflussfaktor. Dies wird gestützt durch die Selbstbestimmungstheorie sowie durch gemäßigt konstruktivistische Vorstellungen zum Lernen. Mittels eines Prä-Posttest-Designs wurden Wissenserwerb und intrinsische Motivation bei 96 Realschülerinnen und Realschülern1 der fünften Jahrgangsstufe evaluiert. Die Schüler der Versuchsgruppe erhielten die Möglichkeit über Inhalt und Methoden einer vierstündigen Unterrichtssequenz abzustimmen. Der darauf folgende Unterricht wurde auf die Schülerwünsche zugeschnitten. Die Schüler der Kontrollgruppe erhielten denselben Unterricht ohne jede Mitbestimmung. Die Umsetzung der Schülerwünsche gelang gut. Im Wissenszuwachs und in unterschiedlichen Dimensionen intrinsischer Motivation waren die Resultate der Versuchsgruppe deutlich erhöht.
Springer Science + Business Media
2009
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-24043357
https://pub.uni-bielefeld.de/record/2404335
https://pub.uni-bielefeld.de/download/2404335/2716807
deu
info:eu-repo/semantics/altIdentifier/issn/0949-1147
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2693625
2018-11-16T11:25:50Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Applicability of Single-Camera Photogrammetry to Determine Body Dimensions of Pinnipeds: Galapagos Sea Lions as an Example
Meise, Kristine
Mueller, Birte
Zein, Beate
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
ddc:590
Meise K, Mueller B, Zein B, Trillmich F. Applicability of Single-Camera Photogrammetry to Determine Body Dimensions of Pinnipeds: Galapagos Sea Lions as an Example. <em>PLoS ONE</em>. 2014;9(7): e101197.
Morphological features correlate with many life history traits and are therefore of high interest to behavioral and evolutionary biologists. Photogrammetry provides a useful tool to collect morphological data from species for which measurements are otherwise difficult to obtain. This method reduces disturbance and avoids capture stress. Using the Galapagos sea lion (Zalophus wollebaeki) as a model system, we tested the applicability of single-camera photogrammetry in combination with laser distance measurement to estimate morphological traits which may vary with an animal’s body position. We assessed whether linear morphological traits estimated by photogrammetry can be used to estimate body length and mass. We show that accurate estimates of body length (males: ±2.0%, females: ±2.6%) and reliable estimates of body mass are possible (males: ±6.8%, females: 14.5%). Furthermore, we developed correction factors that allow the use of animal photos that diverge somewhat from a flat-out position. The product of estimated body length and girth produced sufficiently reliable estimates of mass to categorize individuals into 10 kg-classes of body mass. Data of individuals repeatedly photographed within one season suggested relatively low measurement errors (body length: 2.9%, body mass: 8.1%). In order to develop accurate sex- and age-specific correction factors, a sufficient number of individuals from both sexes and from all desired age classes have to be captured for baseline measurements. Given proper validation, this method provides an excellent opportunity to collect morphological data for large numbers of individuals with minimal disturbance.
Public Library of Science (PLoS)
2014
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-26936256
https://pub.uni-bielefeld.de/record/2693625
https://pub.uni-bielefeld.de/download/2693625/2693631
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0101197
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000341354100069
info:eu-repo/semantics/altIdentifier/pmid/24987983
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2685552
2018-07-24T13:01:07Z
bi_master_thesis
doc-type:masterThesis
ddc:590
bi_master_thesisFtxt
open_access
Photogrammetric determination of body length and body mass in Galápagos sea lions (Zalophus wollebaeki)
Zein, Beate
Photogrammetric
Pinnipeds
Body Mass
Galapagos Sea Lion
Body Length
ddc:590
Zein B. <em>Photogrammetric determination of body length and body mass in Galápagos sea lions (Zalophus wollebaeki)</em>. Bielefeld: University of Bielefeld; 2013.
Measuring body morphometrics of large mammals is difficult, time consuming and requires a lot of equipment. Photogrammetric measurements are less intrusive, faster and only a single researcher with a bag full of equipment is necessary. In the present study a photogrammetric method to determine the body length and mass of Galápagos sea lions (Zalophus wollebaeki) is developed and evaluated. A photogrammetric method developed for body length calculations of whales (Jaquet 2006) is used, extended and improved. Pictures of animals are taken and the distance between camera and animal is used for scaling. For calibration of the camera and validation of the method some animals are captured and body parameters are measured manually. Accuracy (R², s.d.) and precision (mean deviation of manual and photogrammetric values) of the method are evaluated. The application of this photogrammetric method derives highly accurate (adult length R² = 0.777, s.d. = 3.71; mass R² = 0.867, s.d. = 6.26) and precise (mean deviations: length = 2.02, mass = 5.29) calculations of body length and body mass for adult and offspring Galápagos sea lion. Correlations between manually measured and photogrammetrically calculated values are found to be highly significant (p-values: length: p = 0.001, mass: p = 0.0001). Additionally the impact of several factors (while taking the picture, while analyzing or position of the animal in the picture) influencing the accuracy of this method are analyzed. Based on these analyses, recommendations are given for the application of the photogrammetric method to determine body length and mass of sea lions.
University of Bielefeld
2013
http://purl.org/coar/resource_type/c_bdcc
info:eu-repo/semantics/masterThesis
doc-type:masterThesis
text
https://nbn-resolving.org/urn:nbn:de:hbz:361-26855526
https://pub.uni-bielefeld.de/record/2685552
https://pub.uni-bielefeld.de/download/2685552/2685553
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2726541
2020-03-20T12:45:34Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Behavioural phenotypes over the lifetime of a holometabolous insect
Müller, Thorben
Müller, Caroline
Phaedon cochleariae
Holometabolous insect
Behavioural dimensions
Individuality
Activity
Boldness
Lifetime
Metamorphosis
Ontogeny
ddc:590
Müller T, Müller C. Behavioural phenotypes over the lifetime of a holometabolous insect. <em>Frontiers in Zoology</em>. 2015;12(Suppl 1): S8.
Introduction: Behavioural traits can differ considerably between individuals, and such differences were found to be consistent over the lifetime of an organism in several species. Whether behavioural traits of holometabolous insects, which undergo a metamorphosis, are consistent across ontogeny is virtually unexplored. We investigated several behavioural parameters at five different time points in the lifetime of the holometabolous mustard leaf beetle Phaedon cochleariae (Coleoptera: Chrysomelidae), two times in the larval (second and third larval stage) and three times in the adult stage. We investigated 1) the stability of the behavioural phenotype (population level), 2) whether individuals rank consistently across behavioural traits and over their lifetime (individual level), and 3) in how far behavioural traits are correlated with the developmental time of the individuals.
Results: We identified two behavioural dimensions in every life stage of P. cochleariae, activity and boldness (population level). Larvae and young adults ranked consistently across the investigated behavioural traits, whereas consistency over time was only found in adults but not between larvae and adults (individual level). Compared to adult beetles, larvae were less active. Moreover, younger larvae were bolder than all subsequent life stages. Over the adult lifetime of the beetles, males were less active than females. Furthermore, the activity of second instar larvae was significantly negatively correlated with the development time.
Conclusions: Our study highlights that, although there is no individual consistency over the larval and the adult life stage, the behavioural clustering shows similar patterns at all tested life stages of a holometabolous insect. Nevertheless, age- and sex-specific differences in behavioural traits occur which may be explained by different challenges an individual faces at each life stage. These differences are presumably related to the tremendous changes in life-history traits from larvae to adults and/or to a niche shift after metamorphosis as well as to different needs of both sexes, respectively. A faster development of more active compared to less active second instar larvae is in line with the pace-of-life syndrome. Overall, this study demonstrates a pronounced individuality in behavioural phenotypes and presumably adaptive changes related to life stage and sex.
Springer Science + Business Media
2015
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-27265415
https://pub.uni-bielefeld.de/record/2726541
https://pub.uni-bielefeld.de/download/2726541/2900089
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-12-S1-S8
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000363472300008
info:eu-repo/semantics/altIdentifier/pmid/26816525
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2933122
2020-11-09T16:29:20Z
journal_article
doc-type:article
ddc:570
ddc:590
ddc:370
journal_articleFtxt
open_access
Präparation von Gliederfüßlern. Krebse, Heuschrecken und Vogelspinnen für die Schulsammlung
Nolding, Jana ; https://orcid.org/0000-0002-5498-1794
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
Krebse
Heuschrecken
Vogelspinnen
Präparation
ddc:570
ddc:590
ddc:370
Nolding J, Grotjohann N. Präparation von Gliederfüßlern. Krebse, Heuschrecken und Vogelspinnen für die Schulsammlung. <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2018;1(1): 3.
Mit einfachen Mittel können Gliederfüßler dauerhaft für die Biologische Sammlung einer Schule konserviert werden. Der Artikel liefert Anleitungen für Lehrkräfte, Schülerinnen und Schüler zur Präparation von Decapoda, Phasmatidae und Theraphosidae.
Universität Bielefeld, Fakultät für Biologie / Biologiedidaktik (Botanik und Zellbiologie)
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29331222
https://pub.uni-bielefeld.de/record/2933122
https://pub.uni-bielefeld.de/download/2933122/2948597
https://pub.uni-bielefeld.de/download/2933122/2948598
deu
info:eu-repo/semantics/altIdentifier/doi/10.4119/BUPRAKTISCH-1124
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2957750
2021-11-30T08:18:46Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Lifetime Observation of Cognition and Physiological Parameters in Male Mice
Kahnau, Pia
Günther, Anja
Boon, Marcus Nicolaas
Terzenbach, Janine Denise
Hanitzsch, Eric
Lewejohann, Lars
Brust, Vera
laboratory mice
cognition
IntelliCage
lifetime observation
resting
metabolic rate
ddc:570
ddc:590
Kahnau P, Günther A, Boon MN, et al. Lifetime Observation of Cognition and Physiological Parameters in Male Mice. <em>Frontiers in Behavioral Neuroscience </em>. 2021;15: 709775.
Laboratory mice are predominantly used for one experiment only, i.e., new mice are ordered or bred for every new experiment. Moreover, most experiments use relatively young mice in the range of late adolescence to early adulthood. As a consequence, little is known about the day-to-day life of adult and aged laboratory mice. Here we present a long-term data set with three consecutive phases conducted with the same male mice over their lifetime in order to shed light on possible long-term effects of repeated cognitive stimulation. One third of the animals was trained by a variety of learning tasks conducted up to an age of 606 days. The mice were housed in four cages with 12 animals per cage; only four mice per cage had to repeatedly solve cognitive tasks for getting access to water using the IntelliCage system. In addition, these learner mice were tested in standard cognitive tests outside their home-cage. The other eight mice served as two control groups living in the same environment but without having to solve tasks for getting access to water. One control group was additionally placed on the test set-ups without having to learn the tasks. Next to the cognitive tasks, we took physiological measures (body mass, resting metabolic rate) and tested for dominance behavior, and attractivity in a female choice experiment. Overall, the mice were under surveillance until they died a natural death, providing a unique data set over the course of virtually their entire lives. Our data showed treatment differences during the first phase of our lifetime data set. Young learner mice showed a higher activity, less growth and resting metabolic rate, and were less attractive for female mice. These effects, however, were not preserved over the long-term. We also did not find differences in dominance or effects on longevity. However, we generated a unique and valuable set of long-term behavioral and physiological data from a single group of male mice and note that our long-term data contribute to a better understanding of the behavioral and physiological processes in male C57Bl/6J mice.</p>
Frontiers Media
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29577504
https://pub.uni-bielefeld.de/record/2957750
https://pub.uni-bielefeld.de/download/2957750/2957913
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fnbeh.2021.709775
info:eu-repo/semantics/altIdentifier/issn/1662-5153
info:eu-repo/semantics/altIdentifier/wos/000696677600001
info:eu-repo/semantics/altIdentifier/pmid/34539359
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2957852
2022-10-17T14:24:59Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Connectivity of communities interacts with regional heterogeneity in driving species diversity: a mesocosm experiment
Gansfort, Birgit
Uthoff, Jana
Traunspurger, Walter
dispersal
mass effects
metacommunity
nematodes
temperature effects
ddc:590
Gansfort B, Uthoff J, Traunspurger W. Connectivity of communities interacts with regional heterogeneity in driving species diversity: a mesocosm experiment. <em>Ecosphere</em>. 2021;12(9): e03749.
According to metacommunity theory and previous experiments, inter-patch dispersal rates may alter species diversity at local to regional scales. In this study, we tested the predictions of metacommunity theory regarding the effect of dispersal rates on diversity, with a focus on the impact of environmental heterogeneity. Experiments were conducted in which the dispersal frequencies of freshwater nematode communities and the heterogeneity of local environmental conditions were factorial manipulated by maintaining mesocosms under homogeneous or heterogeneous temperature regime. The effect on biodiversity of the dispersal rate, environmental heterogeneity, and the interaction thereof were evaluated using linear (mixed) models, which showed a significant interaction of the dispersal rate and environmental heterogeneity for alpha- and gamma-diversity measures. Specifically, in homogeneous environments an increase in the dispersal rates led to a decline in diversity at local and regional scales. This was due to the increasing dominance of Daptonema dubium, which was favored by a higher patch connectivity that allowed it to invade local communities. In heterogeneous environments, diversity was unaffected, suggesting that rescue and source-sink effects did not play a role for many species, probably due to the wide temperature range. Diversity was also not impacted by high and low dispersal treatments, and the maximum change was already reached at a dispersal rate of <7% in 4 weeks. The communities were then sampled a second time to investigate the development of diversity when dispersal and thus community connectivity are suspended. After only 12 weeks of isolation, the homogenizing effect of dispersal on community disappeared. The results point to the degree of environmental heterogeneity as key factor in the metacommunity framework. They also demonstrate the need to increase experimental complexity in order to facilitate comparisons between experiments.
Wiley
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29578524
https://pub.uni-bielefeld.de/record/2957852
https://pub.uni-bielefeld.de/download/2957852/2957853
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/ecs2.3749
info:eu-repo/semantics/altIdentifier/issn/2150-8925
info:eu-repo/semantics/altIdentifier/issn/2150-8925
info:eu-repo/semantics/altIdentifier/wos/000701322700022
https://creativecommons.org/licenses/by/3.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2934001
2022-03-24T10:46:49Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Impacts of Micro- and Nano-sized plastic particles on Benthic invertebrates: a literature review and gap analysis
Hägerbäumer, Arne
Müller, Marie-Theres ; https://orcid.org/0000-0002-9856-9064
Füser, Hendrik ; https://orcid.org/0000-0001-7549-0794
Traunspurger, Walter
ddc:590
Hägerbäumer A, Müller M-T, Füser H, Traunspurger W. Impacts of Micro- and Nano-sized plastic particles on Benthic invertebrates: a literature review and gap analysis. <em>Frontiers in Environmental Science</em>. 2019;7: 17.
As documented by the numerous publications that have appeared in recent years, plastic pollution of the environment and the effects on the respective ecosystems are currently one of the most intensely discussed issues in environmental science and in society at large. Of special concern are the effects of micro- and nano-sized plastics. A key issue in understanding the fate and potential effects of micro- and nano-sized plastics is their dynamic nature, as the size, shape, and charge of the particles change over time. Moreover, due to various biological processes, such as the aggregation of organic material and/or bacteria (“biofouling”), the density of plastic particles that settle in the sediments of aquatic ecosystems may be several orders of magnitudes higher than that in the surrounding waters. Consequently, the risk posed by plastic pollution to benthic fauna is considerably high. Nonetheless, the vast majority of studies examining the effects of microplastics have focused on pelagic organisms so far. We therefore conducted a comprehensive literature review to examine the impact of micro- and nano-sized plastics on benthic invertebrates, including the physical and chemical effects of leaching and the interactions of plastic particles with contaminants. Overall, 330 papers were reviewed for their fulfillment of different criteria (e.g., test species, plastic material, particle shape, particle size, exposure concentration, exposure route, assay type, assay duration), with 49 publications finally included in our survey. A comprehensive gap-analysis on the effects of plastic particles on benthic invertebrates revealed a wide variety of effects triggered by micro- and/or nano-sized plastics but also distinct differences regarding the plastic materials tested, the size fractions applied, the shape of the respective particles, and the exposure routes tested. Our review concludes with a discussion of the important research gaps concerning freshwater ecosystems and recommendations for future areas of research.
Frontiers Media SA
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29340018
https://pub.uni-bielefeld.de/record/2934001
https://pub.uni-bielefeld.de/download/2934001/2934002
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fenvs.2019.00017
info:eu-repo/semantics/altIdentifier/issn/2296-665X
info:eu-repo/semantics/altIdentifier/wos/000460602900001
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2933720
2021-03-23T16:39:08Z
journal_article
doc-type:article
ddc:590
ddc:370
journal_articleFtxt
open_access
Haie - Ein Jäger wird zum Gejagten
Nolding, Jana ; https://orcid.org/0000-0002-5498-1794
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
ddc:590
ddc:370
Nolding J, Grotjohann N. Haie - Ein Jäger wird zum Gejagten. <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2019;2(1: BU drinnen und draußen): 4.
Der Beitrag gibt einen kurzen Überblick über die Biologie der Haie. Aufgrund der gestiegenen Nachfrage nach Haiprodukten, vor allem Flossen, ist diese sehr alte Tiergruppe akut vom Aussterben bedroht. Das Thema wird, unter besonderer Berücksichtigung des Finnings, für Ökologiekurse der Oberstufe aufgearbeitet.<br /><br />
Wir möchten außerdem Gerhard Wegner sowie dem Fotografen und Entwickler der WHALEGUIDE App Ralf Kiefner für das zur Verfügung stellen ihrer Fotos danken.
Universität Bielefeld, Fakultät für Biologie / Biologiedidaktik (Botanik und Zellbiologie)
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29337201
https://pub.uni-bielefeld.de/record/2933720
https://pub.uni-bielefeld.de/download/2933720/2953162
https://pub.uni-bielefeld.de/download/2933720/2953163
deu
info:eu-repo/semantics/altIdentifier/doi/10.4119/BUPRAKTISCH-1199
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2934672
2020-03-20T12:47:21Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Flatworm mucus as the base of a food web
Wilden, Benjamin
Majdi, Nabil
Kuhlicke, Ute
Neu, Thomas R.
Traunspurger, Walter
Ecological engineering
Mucus structure
Confocal microscopy
Aquatic ecology
Niche construction
ddc:590
Wilden B, Majdi N, Kuhlicke U, Neu TR, Traunspurger W. Flatworm mucus as the base of a food web. <em>BMC Ecology</em>. 2019;19(1): 15.
Background
By altering their habitats, engineering species can improve their own fitness. However, the effect of this strategy on the fitness of coexisting species or on the structure of the respective food web is poorly understood. In this study, bacteria and bacterivorous nematodes with short (Caenorhabditis elegans) and long (Plectus acuminatus) life cycles were exposed to the mucus secreted by the freshwater flatworm Polycelis tenuis. The growth, reproduction, and feeding preferences of the nematodes in the presence/absence of the mucus were then determined. In addition, confocal laser scanning microscopy (CLSM) was used to examine the structural footprint of the mucus and the mucus colonization dynamics of bacteria and protozoans.
Results
Mucus exposure resulted in a greater reproductive output in P. acuminatus than in C. elegans. In a cafeteria experiment, both nematode species were attracted by bacteria-rich patches and were not deterred by mucus. CLSM showed that the flatworms spread a layer of polysaccharide-rich mucus ca. 15 µm thick from their tails. Subsequent colonization of the mucus by bacteria and protozoans resulted in an architecture that progressively resembled a complex biofilm. The presence of protozoans reduced nematode reproduction, presumably due to competition for their bacterial food supply.
Conclusion
Animal secretions such as mucus may have broader, community-level consequences and contribute to fueling microbial food webs.
Springer Nature
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29346727
https://pub.uni-bielefeld.de/record/2934672
https://pub.uni-bielefeld.de/download/2934672/2934705
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12898-019-0231-2
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/wos/000462862100001
info:eu-repo/semantics/altIdentifier/pmid/30925873
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2967058
2024-01-23T08:46:12Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Love is blind: interspecific amplexus of two anuran species, the Common Toad (Bufo bufo) and the Common Frog (Rana temporaria), with fire salamanders (Salamandra salamandra terrestris)
Oswald, Pia ; https://orcid.org/0000-0002-5920-8397
Schulte, Laura ; https://orcid.org/0000-0002-2259-9443
Mühlenhaupt, Max ; https://orcid.org/0000-0003-0234-2533
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
ddc:590
Oswald P, Schulte L, Mühlenhaupt M, Caspers B. Love is blind: interspecific amplexus of two anuran species, the Common Toad (Bufo bufo) and the Common Frog (Rana temporaria), with fire salamanders (Salamandra salamandra terrestris). <em>Herpetology Notes</em>. 2022;15:811-815.
Societas Europaea Herpetologica
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29670584
https://pub.uni-bielefeld.de/record/2967058
https://pub.uni-bielefeld.de/download/2967058/2978173
eng
info:eu-repo/semantics/altIdentifier/issn/2071-5773
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2968252
2023-05-22T07:19:25Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Repeatable parental risk taking across manipulated levels of predation threat: no individual variation in plasticity
Salazar, Stephen ; https://orcid.org/0000-0002-5437-0280
Hlebowicz, Kasper
Komdeur, Jan
Korsten, Peter ; https://orcid.org/0000-0003-0814-9099
animal personality
asset protection
behavioural reaction norm
character state
cognitive flexibility
coping style
multivariate mixed model
random regression
risk taking
speed–accuracy trade-off
ddc:570
ddc:590
Salazar S, Hlebowicz K, Komdeur J, Korsten P. Repeatable parental risk taking across manipulated levels of predation threat: no individual variation in plasticity. <em>Animal Behaviour</em>. 2023;196:127-149.
Individuals respond adaptively to their environment. Yet, they may differ in their responses even when confronted with the same environmental challenge. Several complementary conceptual frameworks suggest that within populations among-individual variation in life history strategies aligns not only with individuals' propensities to take risks across different situations but also with their sensitivity to variation in environmental cues. Risk-prone individuals, suggested to invest more in current reproduction at the cost of their future reproductive prospects, are predicted to be less sensitive to environmental variation than risk-averse individuals. We tested this prediction in a population of breeding blue tits, _Cyanistes caeruleus_, by confronting them with different levels of predation threat at their nests and recording their latency to resume brood provisioning after the removal of the predator stimulus. We presented taxidermic woodpecker, _Dendrocopos major_ (a common brood predator) and sparrowhawk, _Accipiter nisus_ (a common adult predator) mounts at each nest, respectively representing low and high levels of threat to adult blue tits. As a nonpredator control stimulus, we presented a blackbird, _Turdus merula_, mount. We found that on average parents took longer to resume provisioning after presentation of a sparrowhawk than a woodpecker or blackbird. Furthermore, individual latency responses across all threat levels taken together were repeatable. However, despite the population level plastic adjustment to the level of predation threat, we found no evidence for among-individual variation in plasticity. Instead, individual differences in responses were roughly maintained across all levels of threat. While our findings show that individuals differ in their level of risk taking, in the high-stakes and ecologically relevant context of predation risk during parental care, commonly held expectations about among-individual variation in behavioural plasticity were not met.
Elsevier
2023
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29682527
https://pub.uni-bielefeld.de/record/2968252
https://pub.uni-bielefeld.de/download/2968252/2968253
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.anbehav.2022.12.003
info:eu-repo/semantics/altIdentifier/issn/0003-3472
info:eu-repo/semantics/altIdentifier/wos/000974568800001
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2934867
2023-02-01T15:02:28Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effect of prey size and structural complexity on the functional response in a nematode- nematode system
Kreuzinger, Bianca
Brüchner-Hüttemann, Henrike
Traunspurger, Walter
ddc:590
Kreuzinger B, Brüchner-Hüttemann H, Traunspurger W. Effect of prey size and structural complexity on the functional response in a nematode- nematode system. <em>Scientific Reports</em>. 2019;9(1): 5696.
The functional response of a predatory nematode and the influence of different prey sizes and habitat structure on the concerning parameters were analyzed. We hypothesized that the handling of small prey would be less time-consuming, whereas feeding on larger prey would be more efficient. Therefore, type II functional response curves were expected for large prey and a trend towards type III curves for small prey. We expected the introduction of prey refuges to shift the functional response curves from hyperbolic to sigmoidal and that the effect would be even more pronounced with smaller prey. P. muscorum consumed large amounts of small and large C. elegans, with daily per capita ingestion of prey reaching a maximum of 19.8 µg fresh weight, which corresponds to 4.8 times the predator’s biomass. Regardless of prey size and habitat structure, P. muscorum exhibit a type III functional response. Overall, the allometric effect of prey size had a greater effect on the predator’s functional response than did the addition of substrate, presumably due to the similar body shape and mobility of the two nematode species. Our results demonstrate that individual factors such as feeding behavior are important determinants of functional responses and therefore of ecosystem stability.
Springer Nature
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29348671
https://pub.uni-bielefeld.de/record/2934867
https://pub.uni-bielefeld.de/download/2934867/2934869
eng
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-019-42213-x
info:eu-repo/semantics/altIdentifier/issn/2045-2322
info:eu-repo/semantics/altIdentifier/issn/2045-2322
info:eu-repo/semantics/altIdentifier/wos/000463482800036
info:eu-repo/semantics/altIdentifier/pmid/30952927
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2935109
2020-03-23T08:25:26Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Evolution of age at primiparity in pinnipeds in the absence of the quality–quantity trade‐off in reproduction
Kalberer, Stephanie
De Rango, Eugene
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Krüger, Oliver
ddc:590
Kalberer S, De Rango E, Trillmich F, Krüger O. Evolution of age at primiparity in pinnipeds in the absence of the quality–quantity trade‐off in reproduction. <em>Ecology and Evolution</em>. 2019;9(9):5450-5456.
Age at primiparity (AP) is a key life history trait which is crucial to the evolution of life history strategies. This trait is particularly interesting in pinnipeds (walrus, eared seals, and true seals), which are monotocous animals. Thus, the commonly observed trade‐off between offspring quality and quantity does not apply to this taxon. Therefore, comparative studies on the evolution of AP might shed light on other important evolutionary correlates when litter size is fixed. Using phylogenetic generalized least squares analyses, we found a strong negative and robust correlation between relative birth mass (mean pup birth mass as a proportion of mean adult female mass) and AP. Rather than trading‐off an early start of reproduction with light relative offspring mass, this result suggests that pinnipeds exhibit either faster (i.e., higher relative offspring mass leading to shorter lactation length, and thus shorter interbirth interval) or slower life histories and that an early AP and a heavy relative offspring mass co‐evolved into a comparatively fast life history strategy. On the other hand, AP was positively related to lactation length: A later start of reproduction was associated with a longer lactation length. Consequently, variation in AP in pinnipeds seems to be affected by an interplay between costs and benefits of early reproduction mediated by relative investment into the single offspring via relative birth mass and lactation length.
Wiley
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29351092
https://pub.uni-bielefeld.de/record/2935109
https://pub.uni-bielefeld.de/download/2935109/2941999
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5138
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/wos/000467584200034
info:eu-repo/semantics/altIdentifier/pmid/31110693
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2931479
2023-04-19T13:20:54Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Is stemflow a vector for the transport of small metazoans from tree surfaces down to soil?
Ptatscheck, Christoph
Milne, Patrick Connor
Traunspurger, Walter
Forest ecosystems Forest soil Canopy Nematodes Rotifers Collembolans
ddc:590
Ptatscheck C, Milne PC, Traunspurger W. Is stemflow a vector for the transport of small metazoans from tree surfaces down to soil? <em>BMC Ecology</em>. 2018;18(1): 43.
Background
Stemflow is an essential hydrologic process shaping the soil of forests by providing a concentrated input of rainwater and solutions. However, the transport of metazoans by stemflow has yet to be investigated. This 8-week study documented the organisms (< 2 mm) present in the stemflow of different tree species. Because the texture of the tree bark is a crucial determination of stemflow, trees with smooth bark (Carpinus betulus and Fagus sylvatica) and rough bark (Quercus robur) were examined.
Results
Up to 1170 individuals per liter of stemflow were collected. For rotifers and nematodes, a highly positive correlation between abundance and stemflow yield was determined. Both taxa were predominant (rotifers: up to 70%, nematodes: up to 13.5%) in the stemflow of smooth-barked trees whereas in that of the oak trees collembolans were the most abundant organisms (77.3%). The mean number of organisms collected per liter of stemflow from the two species of smooth-barked trees was very similar. A higher number of nematode species was found in the stemflow of these trees than in the stemflow of rough-barked oak and all were typical colonizers of soil- and bark-associated habitats.
Conclusion
This pilot study showed for the first time that stemflow is a transport vector for numerous small metazoans. By connecting tree habitats (e.g., bark, moss, lichens or water-filled tree holes) with soil, stemflow may influence the composition of soil fauna by mediating intensive organismal dispersal.
Springer Nature America, Inc
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29314795
https://pub.uni-bielefeld.de/record/2931479
https://pub.uni-bielefeld.de/download/2931479/2931577
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12898-018-0198-4
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/wos/000447274300001
info:eu-repo/semantics/altIdentifier/pmid/30309345
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2931686
2020-01-17T11:38:22Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Inbreeding alters the chemical phenotype and mating behaviour of a beetle
Müller, Thorben
Lachenicht, Laura
Müller, Caroline
Aggression
Cuticular hydrocarbon profile
inbreeding depression
indirect genetic effects
Phaedon cochleariae
chemical signaling traits
Terminal investment
Wild population
ddc:590
Müller T, Lachenicht L, Müller C. Inbreeding alters the chemical phenotype and mating behaviour of a beetle. <em>Frontiers in Ecology and Evolution</em>. 2018;6:177.
Mating between closely related individuals is often associated with fitness declines. However, less is known about consequences of inbreeding for (sexual) chemical signaling traits and for mate choice and acceptance. Thus, we investigated effects of inbreeding on the chemical phenotype, i.e., the profile and diversity of putative cuticular hydrocarbons (CHCs) in the leaf beetle Phaedon cochleariae Fabricius. Moreover, we tested mating probabilities in no choice bioassays with different combinations of outbred and inbred beetles. Finally, we tested male preferences and female aggression in a dual choice bioassay with one outbred male, one outbred and one inbred female. The chemical phenotype was altered in inbred females, which showed a male-like CHC profile. In no choice bioassays, inbred individuals had a decreased mating probability than outbred individuals. Changes in the chemical phenotype of inbred females might be involved in the negative inbreeding effects on mating acceptance. When having the choice, males did not show any preference between outbred and inbred females. However, inbred females were more aggressive in these situations, potentially to raise their chances to be mated, because due to inbreeding depression they have lower reproductive perspectives than outbred females. Overall, inbreeding effects on the chemical phenotype, mating acceptance and female aggression might have consequences for the population dynamics and development of the individuals. In conclusion, these results suggest that inbreeding events have the potential to affect sexual selection of chemical signaling traits and evolutionary processes underlying mating strategies.
Frontiers
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29316861
https://pub.uni-bielefeld.de/record/2931686
https://pub.uni-bielefeld.de/download/2931686/2933269
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2018.00177
info:eu-repo/semantics/altIdentifier/issn/2296-701X
info:eu-repo/semantics/altIdentifier/wos/000451949100001
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2914441
2020-10-14T11:21:24Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Zebra Finch chicks recognise parental scent, and retain chemosensory knowledge of their genetic mother, even after egg cross-fostering
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
Hagelin, Julie C.
Paul, Madeleine
Bock, Sandra
Willeke, Sandra
Krause, E. Tobias ; https://orcid.org/0000-0002-8327-3711
ddc:590
Caspers B, Hagelin JC, Paul M, Bock S, Willeke S, Krause ET. Zebra Finch chicks recognise parental scent, and retain chemosensory knowledge of their genetic mother, even after egg cross-fostering. <em>Scientific Reports</em>. 2017;7(1): 12859.
Mechanisms underlying parent-offspring recognition in birds have fascinated researchers for centuries. Yet, the possibility that chicks recognise parental odour at hatching has been completely overlooked, despite the fact that olfaction is one of the first sensory modalities to develop, and social chemosignals occur in avian taxa. Here we show that Zebra Finch chicks (Taeniopygia guttata) are capable of identifying parental odours at hatching. In our first experiment, chicks begged significantly longer in response to the odour of their genetic mother or father compared to the odour of a non-relative of the same sex and reproductive status. In a second experiment, we cross-fostered eggs and tested the response of hatchlings to the scent of genetic vs. foster parents. Chicks from cross-fostered eggs responded significantly more to the odour of their genetic mother than their foster mother, but exhibited no difference in response to genetic vs. foster fathers. This is the first evidence that embryonic altricial birds are capable of acquiring chemosensory knowledge of their parents during early development, and retain chemical familiarity with their genetic mother despite egg cross-fostering. Furthermore our data reveals that kin recognition in birds can develop without any association with a genetic parent at hatching.
Springer Nature
2017
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29144418
https://pub.uni-bielefeld.de/record/2914441
https://pub.uni-bielefeld.de/download/2914441/2914770
eng
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-017-13110-y
info:eu-repo/semantics/altIdentifier/issn/2045-2322
info:eu-repo/semantics/altIdentifier/issn/2045-2322
info:eu-repo/semantics/altIdentifier/wos/000412655900006
info:eu-repo/semantics/altIdentifier/pmid/28993703
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2919267
2021-12-07T11:28:52Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Does the early social environment prepare individuals for the future? A match-mismatch experiment in female wild cavies
Sangenstedt, Susanne
Szardenings, Carsten
Sachser, Norbert
Kaiser, Sylvia
Prenatal
Female offspring
Adaptation
Behavioral development
Environmental matching
Energy demanding
Vigilance
Cortisol
Stress responsiveness
Wild cavy
ddc:590
Sangenstedt S, Szardenings C, Sachser N, Kaiser S. Does the early social environment prepare individuals for the future? A match-mismatch experiment in female wild cavies. <em>Frontiers in Zoology</em>. 2018;15: 13.
Background: The social environment that mothers experience during pregnancy and lactation has a strong effect
on the developing offspring. Whether offspring can be adaptively shaped to match an environment that is similar
to the maternal one is still a major question in research. Our previous work in wild cavies showed that females
whose mothers lived in a stable social environment with few social challenges during pregnancy and lactation (SEdaughters)
developed different behavioral phenotypes than females whose mothers lived in an unstable social
environment with frequent social challenges during pregnancy and lactation (UE-daughters). In the present study
we investigated whether SE-daughters are better adapted to a stable social environment, similar to their maternal
one, than are UE-daughters, for which the stable social environment represents a mismatch with their maternal
one. For this purpose, we established pairs of one UE- and one SE-daughter and housed them together under
stable social conditions for one week. Dominance ranks, behavioral profiles, glucocorticoid levels, cortisol
responsiveness and body weight changes were compared between the groups. We hypothesized that SEdaughters
fare better in a stable social setting compared to UE-daughters.
Results: After one week of cohabitation in the stable social condition, UE-daughters had higher glucocorticoid
levels, tended to gain less body weight within the first three days and displayed higher frequencies of energydemanding
behaviors such as rearing and digging than SE-daughters. However, there was no difference in cortisol
responsiveness as well as in dominance ranks between UE- and SE-daughters.
Conclusion: Higher glucocorticoid levels and less body weight gain imply that UE-daughters had higher energy
demands than SE-daughters. This high energy demand of UE-daughters is further indicated by the increased
display of rearing and digging behavior. Rearing implies increased vigilance, which is far too energy demanding in a
stable social condition but may confer an advantage in an unstable social environment. Hence, SE-daughters seem
to better match a stable social environment, similar to their maternal one, than do UE-daughters, who encountered
a mismatch to their maternal environment. This data supports the environmental matching hypothesis, stating that
individuals manage the best in environments that correspond to their maternal ones.
Springer Nature
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29192672
https://pub.uni-bielefeld.de/record/2919267
https://pub.uni-bielefeld.de/download/2919267/2919268
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12983-018-0261-1
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000430733800001
info:eu-repo/semantics/altIdentifier/pmid/29686721
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2919597
2023-04-19T13:23:33Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The extent of wind-mediated dispersal of small metazoans, focusing nematodes
Ptatscheck, Christoph
Gansfort, Birgit
Traunspurger, Walter
ddc:590
Ptatscheck C, Gansfort B, Traunspurger W. The extent of wind-mediated dispersal of small metazoans, focusing nematodes. <em>Scientific Reports</em>. 2018;8(1): 6814.
Wind-mediated transport is an important mechanism in the dispersal of small metazoans. Yet, concrete dispersal rates have hardly been examined. Here we present the results of an one-year field experiment investigating the composition and dispersal rates of aeroplankton. To gain insights into the dynamics of dispersal at the species level, we focused on nematodes, worldwide the most common metazoan taxon. Among the six taxa collected in this study (nematodes, rotifers, collembolans, tardigrades, mites, and thrips), nematodes had the highest dispersal rates (up to >3000 individuals m−2 in 4 weeks, 27 species identified) and represented >44% of aeroplankton. Only living nematodes, and no propagules, were dispersed. All taxa had a higher dispersal potential in environments linked to the source habitat, evidenced by the much higher deposition of organisms in funnels placed on the ground than on the rooftop of a ten-story building. Nematodes under conditions of high humidity and wind speed had the highest dispersal rates, while increasing temperatures and dryness had a significantly positive impact on the wind drift of mites and thrips. The results indicated that wind dispersal over long distances is possible. The notable organismal input by wind dispersal may contribute to biodiversity and ecosystem functions.
Springer Nature
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29195978
https://pub.uni-bielefeld.de/record/2919597
https://pub.uni-bielefeld.de/download/2919597/2920132
eng
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-018-24747-8
info:eu-repo/semantics/altIdentifier/issn/2045-2322
info:eu-repo/semantics/altIdentifier/wos/000431113500001
info:eu-repo/semantics/altIdentifier/pmid/29717144
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2919845
2020-03-20T12:45:45Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Lifetime inbreeding depression in a leaf beetle
Müller, Thorben
Lamprecht, Tabea
Schrieber, Karin
ddc:590
Müller T, Lamprecht T, Schrieber K. Lifetime inbreeding depression in a leaf beetle. <em>Ecology and Evolution</em>. 2018;8(14):6889-6898.
Ongoing habitat loss and fragmentation result in rapid population size reductions, which can increase the levels of inbreeding. Consequently, many species are threatened by inbreeding depression, a loss of individual fitness following the mating of close relatives. Here, we investigated inbreeding effects on fitness‐related traits throughout the lifetime of the mustard leaf beetle (Phaedon cochleariae) and mechanisms for the avoidance of inbreeding. Previously, we found that these beetles have family‐specific cuticular hydrocarbon profiles, which are likely not used as recognition cue for precopulatory inbreeding avoidance. Thus, we examined whether adult beetles show postcopulatory inbreeding avoidance instead. For this purpose, we determined the larval hatching rate of eggs laid by females mated sequentially with two nonsiblings, two siblings, a nonsibling, and a sibling or vice versa. The beetles suffered from inbreeding depression throughout their entire ontogeny, as evinced by a prolonged larval development, a decreased larval and adult survival and a decreased reproductive output of inbred compared to outbred individuals. The highest larval hatching rates were detected when females were mated with two nonsiblings or first with a sibling and second with a nonsibling. Significantly lower hatching rates were measured in the treatments with a sibling as second male. Thus, the results do not support the existence of postcopulatory inbreeding avoidance in P. cochleariae, but revealed evidence for second male sperm precedence. Consequently, an alternative strategy to avoid inbreeding costs might exist in this beetle, such as a polyandrous mating system, potentially coupled with a specific dispersal behavior.
Wiley
2018
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29198453
https://pub.uni-bielefeld.de/record/2919845
https://pub.uni-bielefeld.de/download/2919845/2921322
https://pub.uni-bielefeld.de/download/2919845/2931657
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.4205
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/wos/000440138400005
info:eu-repo/semantics/altIdentifier/pmid/30073053
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2918890
2021-12-07T11:28:52Z
research_data
doc-type:ResearchData
ddc:590
research_dataFtxt
open_access
Data to "Does the early social environment prepare individuals for the future? A match-mismatch experiment in female wild cavies"
Sangenstedt, Susanne
ddc:590
Sangenstedt S. <em>Data to "Does the early social environment prepare individuals for the future? A match-mismatch experiment in female wild cavies"</em>. Bielefeld University; 2018.
Does the early social environment prepare individuals for the future? A match-mismatch experiment in female wild cavies
Bielefeld University
2018
http://purl.org/coar/resource_type/c_ddb1
info:eu-repo/semantics/other
doc-type:ResearchData
text
https://pub.uni-bielefeld.de/record/2918890
https://pub.uni-bielefeld.de/download/2918890/2918891
info:eu-repo/semantics/altIdentifier/doi/10.4119/unibi/2918890
https://creativecommons.org/publicdomain/zero/1.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2937121
2020-03-23T08:23:59Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Senescence and costs of reproduction in the life history of a small precocial species
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Geißler, Edda
Günther, Anja
postnatal development and mortality
reproductive effort
reproductive
seasonality
reproductive senescence
trade-off
ddc:590
Trillmich F, Geißler E, Günther A. Senescence and costs of reproduction in the life history of a small precocial species. <em>Ecology and Evolution</em>. 2019;9(12):7069-7079.
Species following a fast life history are expected to express fitness costs mainly as increased mortality, while slow-lived species should suffer fertility costs. Because observational studies have limited power to disentangle intrinsic and extrinsic factors influencing senescence, we manipulated reproductive effort experimentally in the cavy (Cavia aperea) which produces extremely precocial young. We created two experimental groups: One was allowed continuous reproduction (CR) and the other intermittent reproduction (IR) by removing males at regular intervals. We predicted that the CR females should senesce (and die) earlier and produce either fewer and/or smaller, slower growing offspring per litter than those of the IR group. CR females had 16% more litters during three years than IR females. CR females increased mass and body condition more steeply and both remained higher until the experiment ended. Female survival showed no group difference. Reproductive senescence in litter size, litter mass, and reproductive effort (litter mass/maternal mass) began after about 600 days and was slightly stronger in CR than IR females. Litter size, litter mass, and offspring survival declined with maternal age and were influenced by seasonality. IR females decreased reproductive effort less during cold seasons and only at higher age than CR females. Nevertheless, offspring winter mortality was higher in IR females. Our results show small costs of reproduction despite high reproductive effort, suggesting that under ad libitum food conditions costs depend largely on internal regulation of allocation decisions.
Wiley
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29371213
https://pub.uni-bielefeld.de/record/2937121
https://pub.uni-bielefeld.de/download/2937121/2942014
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.5272
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/wos/000478648300025
info:eu-repo/semantics/altIdentifier/pmid/31380034
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2936234
2021-03-23T16:42:17Z
journal_article
doc-type:article
ddc:590
ddc:370
journal_articleFtxt
open_access
Der Fischkonsum und seine Auswirkungen auf die Meere. Darstellungen des Problemfelds mitsamt kommentierten Materialien für eine Umsetzung in die schulische Praxis
Schmäing, Till ; https://orcid.org/0000-0002-3823-0982
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
ddc:590
ddc:370
Schmäing T, Grotjohann N. Der Fischkonsum und seine Auswirkungen auf die Meere. Darstellungen des Problemfelds mitsamt kommentierten Materialien für eine Umsetzung in die schulische Praxis . <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2019;2(1: BU drinnen und draußen):3.
Universität Bielefeld. Fakultät für Biologie, Biologiedidaktik
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29362342
https://pub.uni-bielefeld.de/record/2936234
https://pub.uni-bielefeld.de/download/2936234/2953164
https://pub.uni-bielefeld.de/download/2936234/2953165
deu
info:eu-repo/semantics/altIdentifier/doi/10.4119/BUPRAKTISCH-1200
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2908300
2020-03-20T12:46:13Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effects of the social environment during adolescence on the development of social behaviour, hormones and morphology in male zebra finches (Taeniopygia guttata)
Bölting, Stefanie
von Engelhardt, Nikolaus ; https://orcid.org/0000-0003-4971-6408
Social environment Adolescence Social interactions Maturation Testosterone Corticosterone Plumage colouration Courtship Aggression Song
ddc:590
Bölting S, von Engelhardt N. Effects of the social environment during adolescence on the development of social behaviour, hormones and morphology in male zebra finches (Taeniopygia guttata). <em>Frontiers in Zoology</em>. 2017;14(1): 5.
Background
Individual differences in behaviour are widespread in the animal kingdom and often influenced by the size or composition of the social group during early development. In many vertebrates the effects of social interactions early in life on adult behaviour are mediated by changes in maturation and physiology. Specifically, increases in androgens and glucocorticoids in response to social stimulation seem to play a prominent role in shaping behaviour during development. In addition to the prenatal and early postnatal phase, adolescence has more recently been identified as an important period during which adult behaviour and physiology are shaped by the social environment, which so far has been studied mostly in mammals. We raised zebra finches (Taeniopygia guttata) under three environmental conditions differing in social complexity during adolescence - juvenile pairs, juvenile groups, and mixed-age groups - and studied males’ behavioural, endocrine, and morphological maturation, and later their adult behaviour.
Results
As expected, group-housed males exhibited higher frequencies of social interactions. Group housing also enhanced song during adolescence, plumage development, and the frequency and intensity of adult courtship and aggression. Some traits, however, were affected more in juvenile groups and others in mixed-age groups. Furthermore, a testosterone peak during late adolescence was suppressed in groups with adults. In contrast, corticosterone concentrations did not differ between rearing environments. Unexpectedly, adult courtship in a test situation was lowest in pair-reared males and aggression depended upon the treatment of the opponent with highest rates shown by group-reared males towards pair-reared males. This contrasts with previous findings, possibly due to differences in photoperiod and the acoustic environment.
Conclusion
Our results support the idea that effects of the adolescent social environment on adult behaviour in vertebrates are mediated by changes in social interactions affecting behavioural and morphological maturation. We found no evidence that long-lasting differences in behaviour reflect testosterone or corticosterone levels during adolescence, although differences between juvenile and mixed-age groups suggest that testosterone and song behaviour during late adolescence may be associated.
Springer Nature
2017
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29083002
https://pub.uni-bielefeld.de/record/2908300
https://pub.uni-bielefeld.de/download/2908300/2908301
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12983-017-0190-4
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000392672900001
info:eu-repo/semantics/altIdentifier/pmid/28149319
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2908857
2020-01-17T11:38:17Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Dimensions of Animal Personalities in Guinea Pigs
Zipser, Benjamin
Kaiser, Sylvia
Sachser, Norbert
ddc:590
Zipser B, Kaiser S, Sachser N. Dimensions of Animal Personalities in Guinea Pigs. <em>Ethology</em>. 2013;119(11):970-982.
Wiley-Blackwell
2013
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29088571
https://pub.uni-bielefeld.de/record/2908857
https://pub.uni-bielefeld.de/download/2908857/2908860
eng
info:eu-repo/semantics/altIdentifier/issn/0044-3573
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2908863
2020-03-20T12:46:11Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Effects of domestication on biobehavioural profiles: a comparison of domestic guinea pigs and wild cavies from early to late adolescence
Zipser, Benjamin
Schleking, Anja
Kaiser, Sylvia
Sachser, Norbert
ddc:590
Zipser B, Schleking A, Kaiser S, Sachser N. Effects of domestication on biobehavioural profiles: a comparison of domestic guinea pigs and wild cavies from early to late adolescence. <em>Frontiers in Zoology</em>. 2014;11(1): 30.
BioMed Central
2014
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29088630
https://pub.uni-bielefeld.de/record/2908863
https://pub.uni-bielefeld.de/download/2908863/2908865
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-11-30
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000334532700001
info:eu-repo/semantics/altIdentifier/pmid/24716471
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2907878
2022-01-02T02:55:06Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Host plant effects on the behavioural phenotype of a Chrysomelid
Müller, Thorben
Müller, Caroline
ddc:590
Müller T, Müller C. Host plant effects on the behavioural phenotype of a Chrysomelid. <em>Ecological Entomology</em>. 2017;42(3):336-344.
Wiley
2017
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29078784
https://pub.uni-bielefeld.de/record/2907878
https://pub.uni-bielefeld.de/download/2907878/2909036
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/een.12389
info:eu-repo/semantics/altIdentifier/issn/0307-6946
info:eu-repo/semantics/altIdentifier/issn/1365-2311
info:eu-repo/semantics/altIdentifier/wos/000400032200011
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2778793
2020-03-20T12:46:00Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The maternal social environment shapes offspring growth, physiology, and behavioural phenotype in guinea pigs
von Engelhardt, Nikolaus ; https://orcid.org/0000-0003-4971-6408
Kowalski, Gabriele J
Günther, Anja
maternal effects
social
density
prenatal
development
sex-specific
growth
behaviour
guinea pig
Cavia aperea f. porcellus
ddc:590
von Engelhardt N, Kowalski GJ, Günther A. The maternal social environment shapes offspring growth, physiology, and behavioural phenotype in guinea pigs. <em>Frontiers in Zoology</em>. 2015;12(Suppl 1): S13.
Background
Prenatal conditions influence offspring development in many species. In mammals, the effects of social density have traditionally been considered a detrimental form of maternal stress. Now their potential adaptive significance is receiving greater attention.Sex-specific effects of maternal social instability on offspring in guinea pigs (Cavia aperea f. porcellus) have been interpreted as adaptations to high social densities, while the effects of low social density are unknown. Hence, we compared morphological, behavioural and physiological development between offspring born to mothers housed either individually or in groups during the second half of pregnancy.
Results
Females housed individually and females housed in groups gave birth to litters of similar size and sex-ratios, and there were no differences in birth weight. Sons of individually-housed mothers grew faster than their sisters, whereas daughters ofgroup-housed females grew faster than their brothers, primarily due to an effect on growth of daughters. There were few effects on offspring behaviour. Baseline cortisol levels in saliva of pups on day 1 and day 7 were not affected, but we saw a blunted cortisol response to social separation on day 7 in sons of individually-housed females and daughters of group-housed females. The effects were consistent across two replicate experiments.
Conclusions
The observed effects only partially support the adaptive hypothesis. Increased growth of daughters may be adaptive under high densities due to increasedfemale competition, but it is unclear why growth of sons is not increased under low social densities when males face less competition from older, dominant males. The differences in growth may be causally linked to sex-specific effects on cortisol response, although individual cortisol response and growth were not correlated, and various other mechanisms are possible. The observed sex-specific effects on early development are intriguing, yet the potential adaptive benefits and physiological mechanisms require further study.
Springer Science + Business Media
2015
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-27787939
https://pub.uni-bielefeld.de/record/2778793
https://pub.uni-bielefeld.de/download/2778793/2900090
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-12-S1-S13
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000363472300013
info:eu-repo/semantics/altIdentifier/pmid/26816513
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2778802
2020-03-20T12:46:00Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Personality over ontogeny in zebra finches: long-term repeatable traits but unstable behavioural syndromes
Würz, Yvonne
Krüger, Oliver
Animal personality
behavioural syndrome
repeatability
consistency
ontogeny
tonic immobility
exploration
boldness
aggression
activity
ddc:590
Würz Y, Krüger O. Personality over ontogeny in zebra finches: long-term repeatable traits but unstable behavioural syndromes. <em>Frontiers in Zoology</em>. 2015;12(Suppl 1): S9.
A crucial assumption of animal personality research is that behaviour is consistent over time, showing a high repeatability within individuals. This assumption is often made, sometimes tested using short time intervals between behavioural tests, but rarely thoroughly investigated across long time intervals crossing different stages of ontogeny. We performed such a longitudinal test across three life stages in zebra finches (Taeniopygia guttata), representing about 15-20% of their life span in captivity, and found repeatabilities ranging from 0.03 to 0.67. Fearlessness and exploration were the most repeatable traits both within and across life stages. Activity and aggression were repeatable across, but not or only partly within life stages. Boldness was not repeatable. Furthermore, we found no evidence for a consistent behavioural syndrome structure across ontogeny. Our results indicate that the consistency of behavioural traits and their correlations might be overestimated and suggest that life-long stability of animal personality should not simply be assumed.
Springer Science + Business Media
2015
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-27788021
https://pub.uni-bielefeld.de/record/2778802
https://pub.uni-bielefeld.de/download/2778802/2900091
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-12-S1-S9
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000363472300009
info:eu-repo/semantics/altIdentifier/pmid/26813709
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2906541
2018-11-05T14:50:30Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
No proof for subjective experience in insects
Cruse, Holk
Schilling, Malte ; https://orcid.org/0000-0002-0849-483X
ddc:590
Cruse H, Schilling M. No proof for subjective experience in insects. <em>Animal Sentience</em>. 2016;1(9): 123.
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29065410
https://pub.uni-bielefeld.de/record/2906541
https://pub.uni-bielefeld.de/download/2906541/2906542
eng
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2906543
2018-11-05T14:50:30Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Avoid the hard problem: Employment of mental simulation for prediction is already a crucial step
Schilling, Malte ; https://orcid.org/0000-0002-0849-483X
Cruse, Holk
ddc:590
Schilling M, Cruse H. Avoid the hard problem: Employment of mental simulation for prediction is already a crucial step. <em>Proceedings of the National Academy of Sciences of the United States of America</em>. 2016;113(27): E3811.
Proceedings of the National Academy of Sciences
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29065437
https://pub.uni-bielefeld.de/record/2906543
https://pub.uni-bielefeld.de/download/2906543/2906544
eng
info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.1607146113
info:eu-repo/semantics/altIdentifier/issn/0027-8424
info:eu-repo/semantics/altIdentifier/issn/1091-6490
info:eu-repo/semantics/altIdentifier/wos/000379021700001
info:eu-repo/semantics/altIdentifier/pmid/27357663
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2904608
2020-10-13T11:47:28Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Multidimensionality of chemical information in male greater sac-winged bats (Saccopteryx bilineata)
Schneeberger, Karin
Voigt, Christian
Müller, Caroline
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
ddc:590
Schneeberger K, Voigt C, Müller C, Caspers B. Multidimensionality of chemical information in male greater sac-winged bats (Saccopteryx bilineata). <em>Frontiers in Ecology and Evolution</em>. 2016;4: 83.
The complexity of social signals is thought to depend on the complexity of social systems, but evidence from wild animals is scarce. Here, we investigated the chemical information provided by individual male greater sac-winged bats (Saccopteryx bilineata), a small, long-lived neotropical bat species with a harem-polygynous mating system. We analysed the chemical fingerprints of wing-sac liquids that are displayed by males in front of females. Specifically, we tested if fingerprints of 45 males included information about age (adult, juvenile), year of sampling, and distance between colonies. We confirmed age-specific differences in male-specific substances, but show furthermore that chemical fingerprints correlate with year of collection and distance between colonies. Thus, the wing-sac chemistry of male S. bilineata conveys a multitude of information, which can potentially be used by conspecifics, especially by females to assess the status of potential mates. Our study provides evidence for a multidimensionality of chemical information in a free-ranging mammal with high social complexity.
Frontiers Media
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29046088
https://pub.uni-bielefeld.de/record/2904608
https://pub.uni-bielefeld.de/download/2904608/2904981
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2016.00083
info:eu-repo/semantics/altIdentifier/issn/2296-701X
info:eu-repo/semantics/altIdentifier/wos/000452062100082
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2903596
2021-04-28T16:31:55Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Female Zebra Finches smell their eggs
Golüke, Sarah
Dörrenberg, Sebastian
Krause, E. Tobias ; https://orcid.org/0000-0002-8327-3711
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
ddc:590
Golüke S, Dörrenberg S, Krause ET, Caspers B. Female Zebra Finches smell their eggs. <em>PLOS ONE</em>. 2016;11(5): e0155513.
Parental investment in unrelated offspring seems maladaptive from an evolutionary perspective, due to the costs of energy and resources that cannot be invested in related offspring at the same time. Therefore selection should favour mechanisms to discriminate between own and foreign offspring. In birds, much emphasis has been placed on understanding the visual mechanisms underlying egg recognition. However, olfactory egg recognition has almost been completely ignored. Here, we investigated whether female zebra finches (Taeniopygia guttata) are able to discriminate between their own and a conspecific egg based on olfactory cues alone. Zebra finches are colonial—breeding songbirds. Eggs are monomorphic, i.e. without any spotting pattern, and intraspecific brood parasitism frequently occurs. In a binary choice experiment, female zebra finches were given the choice between the scent of their own and a conspecific egg. After the onset of incubation, females chose randomly and showed no sign of discrimination. However, shortly before hatching, females preferred significantly the odour of their own egg. The finding that females are capable to smell their own egg may inspire more research on the potential of olfaction involved in egg recognition, especially in cases where visual cues might be limited.
Public Library of Science (PLoS)
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29035966
https://pub.uni-bielefeld.de/record/2903596
https://pub.uni-bielefeld.de/download/2903596/2904646
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0155513
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000376286100060
info:eu-repo/semantics/altIdentifier/pmid/27192061
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2903605
2020-03-20T12:46:50Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Multiple Visual Field Representations in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata)
Bischof, Hans-Joachim
Eckmeier, Dennis
Keary, Nina
Löwel, Siegrid
Mayer, Uwe
Michael, Neethu
ddc:590
Bischof H-J, Eckmeier D, Keary N, Löwel S, Mayer U, Michael N. Multiple Visual Field Representations in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). <em>PLOS ONE</em>. 2016;11(5): e0154927.
The visual wulst is the telencephalic target of the avian thalamofugal visual system. It contains several retinotopically organised representations of the contralateral visual field. We used optical imaging of intrinsic signals, electrophysiological recordings, and retrograde tracing with two fluorescent tracers to evaluate properties of these representations in the zebra finch, a songbird with laterally placed eyes. Our experiments revealed that there is some variability of the neuronal maps between individuals and also concerning the number of detectable maps. It was nonetheless possible to identify three different maps, a posterolateral, a posteromedial, and an anterior one, which were quite constant in their relation to each other. The posterolateral map was in contrast to the two others constantly visible in each successful experiment. The topography of the two other maps was mirrored against that map. Electrophysiological recordings in the anterior and the posterolateral map revealed that all units responded to flashes and to moving bars. Mean directional preferences as well as latencies were different between neurons of the two maps. Tracing experiments confirmed previous reports on the thalamo-wulst connections and showed that the anterior and the posterolateral map receive projections from separate clusters within the thalamic nuclei. Maps are connected to each other by wulst intrinsic projections. Our experiments confirm that the avian visual wulst contains several separate retinotopic maps with both different physiological properties and different thalamo-wulst afferents. This confirms that the functional organization of the visual wulst is very similar to its mammalian equivalent, the visual cortex.
Public Library of Science (PLoS)
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29036053
https://pub.uni-bielefeld.de/record/2903605
https://pub.uni-bielefeld.de/download/2903605/2903606
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0154927
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000375675700076
info:eu-repo/semantics/altIdentifier/pmid/27139912
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2903613
2022-01-02T02:55:07Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Adult beetles compensate for poor larval food conditions
Müller, Thorben
Müller, Caroline
ddc:590
Müller T, Müller C. Adult beetles compensate for poor larval food conditions. <em>Journal of Insect Physiology</em>. 2016;88:24-32.
Elsevier BV
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29036134
https://pub.uni-bielefeld.de/record/2903613
https://pub.uni-bielefeld.de/download/2903613/2909048
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jinsphys.2016.02.009
info:eu-repo/semantics/altIdentifier/issn/0022-1910
info:eu-repo/semantics/altIdentifier/issn/1879-1611
info:eu-repo/semantics/altIdentifier/wos/000374426200004
info:eu-repo/semantics/altIdentifier/pmid/26906247
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2903262
2020-03-20T12:46:48Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
On the Challenge of Interpreting Census Data: Insights from a Study of an Endangered Pinniped
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Meise, Kristine
Kalberer, Stephanie
Mueller, Birte
Piedrahita, Paolo
Pörschmann, Ulrich
Wolf, Jochen B.W.
Krüger, Oliver
ddc:590
Trillmich F, Meise K, Kalberer S, et al. On the Challenge of Interpreting Census Data: Insights from a Study of an Endangered Pinniped. <em>PLOS ONE</em>. 2016;11(5): e0154588.
Population monitoring is vital for conservation and management. However, simple counts of animals can be misleading and this problem is exacerbated in seals (pinnipeds) where individuals spend much time foraging away from colonies. We analyzed a 13-year-series of census data of Galapagos sea lions (Zalophus wollebaeki) from the colony of Caamaño, an islet in the center of the Galapagos archipelago where a large proportion of animals was individually marked. Based on regular resighting efforts during the cold, reproductive (cold-R; August to January) and the warm, non-reproductive (warm-nR; February to May) season, we document changes in numbers for different sex and age classes. During the cold-R season the number of adults increased as the number of newborn pups increased. Numbers were larger in the morning and evening than around mid-day and not significantly influenced by tide levels. More adults frequented the colony during the warm-nR season than the cold-R season. Raw counts suggested a decline in numbers over the 13 years, but Lincoln-Petersen (LP-) estimates (assuming a closed population) did not support that conclusion. Raw counts and LP estimates were not significantly correlated, demonstrating the overwhelming importance of variability in attendance patterns of individuals. The probability of observing a given adult in the colony varied between 16% (mean for cold-R season) and 23% (warm-nR season) and may be much less for independent 2 to 4 year olds. Dependent juveniles (up to the age of about 2 years) are observed much more frequently ashore (35% during the cold-R and 50% during the warm-nR seasons). Simple counts underestimate real population size by a factor of 4–6 and may lead to erroneous conclusions about trends in population size.
Public Library of Science (PLoS)
2016
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29032623
https://pub.uni-bielefeld.de/record/2903262
https://pub.uni-bielefeld.de/download/2903262/2903263
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0154588
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000375676800042
info:eu-repo/semantics/altIdentifier/pmid/27148735
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2901940
2018-07-24T13:01:28Z
dissertation
doc-type:doctoralThesis
ddc:570
ddc:590
dissertationFtxt
open_access
Avian sex allocation and ornamental coloration: a study on blue tits
Korsten, Peter ; https://orcid.org/0000-0003-0814-9099
ddc:570
ddc:590
Korsten P. <em>Avian sex allocation and ornamental coloration: a study on blue tits</em>.; 2006.
2006
http://purl.org/coar/resource_type/c_46ec
info:eu-repo/semantics/doctoralThesis
doc-type:doctoralThesis
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29019406
https://pub.uni-bielefeld.de/record/2901940
https://pub.uni-bielefeld.de/download/2901940/2907534
eng
info:eu-repo/semantics/altIdentifier/isbn/90-367-2841-X
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2737114
2020-03-20T12:45:31Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Zebra finch males compensate in plumage ornaments at sexual maturation for a bad start in life
Krause, E. Tobias ; https://orcid.org/0000-0002-8327-3711
Naguib, Marc
early developmental stress
fitness
personality
sexual selection
ornaments
nutritional stress
compensation
exploration behaviour
ddc:590
Krause ET, Naguib M. Zebra finch males compensate in plumage ornaments at sexual maturation for a bad start in life. <em>Frontiers in Zoology</em>. 2015;12(Suppl. 1): S11.
Background
An individual's fitness in part depends on the characteristics of the mate so that sexually attractive ornaments, as signals of quality, are used in mate choice. Often such ornaments develop already early in life and thus are affected by nutritional conditions experienced then. Individuals thus should benefit by compensating as soon as possible for poor initial development of ornaments, to be attractive already at sexual maturity. Here, we tested whether early nutritional stress affects the cheek patch size of male Zebra finches (Taeniopygia guttata), which are important in mate choice, and whether a small cheek patch size early on is compensated at sexual maturation. Furthermore we tested whether exploration behaviour is affected by such a compensation, as shown for other compensatory growth trajectories.
Results
Zebra finch males which were raised under poorer nutritional conditions initially expressed smaller cheek patches at day 50 post-hatching but then compensated in cheek patch size already at 65 days, i.e. when becoming sexually mature. Furthermore, compensatory growth in cheek patch during adolescence was negatively correlated with activity and exploration behaviour, measured in a novel environment.
Conclusion
This compensation in cheek patch size benefits male attractiveness but also was related to less exploration behaviour, an established proxy for avian personality traits. We discuss the possibility that compensatory priorities exist so that not all deficits from a bad start are caught-up at the same time. Resource allocation to compensate for poorly expressed traits is likely to have evolved to optimise traits by the time they are most beneficial.
Springer Science + Business Media
2015
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-27371143
https://pub.uni-bielefeld.de/record/2737114
https://pub.uni-bielefeld.de/download/2737114/2771942
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/1742-9994-12-S1-S11
info:eu-repo/semantics/altIdentifier/issn/1742-9994
info:eu-repo/semantics/altIdentifier/wos/000363472300011
info:eu-repo/semantics/altIdentifier/pmid/26816511
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2944323
2020-10-06T11:20:31Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Blood parasites in vectors reveal a united blackfly community in the upper canopy.
Chakarov, Nayden
Kampen, Helge
Wiegmann, Anja
Werner, Doreen
Bensch, Staffan
ddc:590
Chakarov N, Kampen H, Wiegmann A, Werner D, Bensch S. Blood parasites in vectors reveal a united blackfly community in the upper canopy. <em>Parasites & vectors</em>. 2020;13(1): 309.
BACKGROUND: The behaviour of blood-sucking arthropods is a crucial determinant of blood protozoan distribution and hence of host-parasite coevolution, but it is very challenging to study in the wild. The molecular identification of parasite lineages in vectors can be a useful key to understand the behaviour and transmission patterns realised by these vectors.; METHODS: In this study, we collected blackflies around nests of three raptor species in the upper forest canopy in central Europe and examined the presence of vertebrate DNA and haemosporidian parasites in them. We molecularly analysed 156 blackfly individuals, their vertebrate blood meals, and the haemosporidian parasite lineages they carried.; RESULTS: We identified nine species of Simulium blackflies, largely belonging to the subgenera Nevermannia and Eusimulium. Only 1% of the collected specimens was visibly engorged, and only 4% contained remains of host DNA. However, in 29% of the blackflies Leucocytozoon lineages were identified, which is evidence of a previous blood meal on an avian host. Based on the known vertebrate hosts of the recorded Leucocytozoon lineages, we can infer that large and/or abundant birds, such as thrushes, crows, pigeons, birds of prey, owls and tits are the main targets of ornithophilic blackflies in the canopy. Blackfly species contained similar proportions of host group-specific parasite lineages and thus do not appear to be associated with particular host groups.; CONCLUSIONS: The Leucocytozoon clade infecting thrushes, crows, and pigeons present in most represented blackfly species suggests a lack of association between hosts and blackflies, which can increase the probability of host switches of blood parasites. However, the composition of the simuliid species differed between nests of common buzzards, goshawks and red kites. This segregation can be explained by coinciding habitat preferences between host and vector, and may lead to the fast speciation of Leucocytozoon parasites. Thus, subtle ecological preferences and lack of host preference of vectors in the canopy may enable both parasite diversification and host switches, and enforce a habitat-dependent evolution of avian malaria parasites and related haemosporidia.
Springer Nature
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29443234
https://pub.uni-bielefeld.de/record/2944323
https://pub.uni-bielefeld.de/download/2944323/2944349
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s13071-020-04177-0
info:eu-repo/semantics/altIdentifier/issn/1756-3305
info:eu-repo/semantics/altIdentifier/wos/000542780100001
info:eu-repo/semantics/altIdentifier/pmid/32539849
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2943727
2020-10-06T11:20:30Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Climate Change and Green Sea Turtle Sex Ratio — Preventing Possible Extinction
Blechschmidt, Jana
Wittmann, Meike
Blüml, Chantal
evolutionary rescue
global warming
rapid evolution
Chelonia mydas
temperature-dependent sex determination
ddc:590
Blechschmidt J, Wittmann M, Blüml C. Climate Change and Green Sea Turtle Sex Ratio — Preventing Possible Extinction. <em>Genes</em>. 2020;11(5): 588.
Climate change poses a threat to species with temperature-dependent sex determination (TSD). A recent study on green sea turtles (Chelonia mydas) at the northern Great Barrier Reef (GBR) showed a highly female-skewed sex ratio with almost all juvenile turtles being female. This shortage of males might eventually cause population extinction, unless rapid evolutionary rescue, migration, range shifts, or conservation efforts ensure a sufficient number of males. We built a stochastic individual-based model inspired by C. mydas but potentially transferrable to other species with TSD. Pivotal temperature, nest depth, and shading were evolvable traits. Additionally, we considered the effect of crossbreeding between northern and southern GBR, nest site philopatry, and conservation efforts. Among the evolvable traits, nest depth was the most likely to rescue the population, but even here the warmer climate change scenarios led to extinction. We expected turtles to choose colder beaches under rising temperatures, but surprisingly, nest site philopatry did not improve persistence. Conservation efforts promoted population survival and did not preclude trait evolution. Although extra information is needed to make reliable predictions for the fate of green sea turtles, our results illustrate how evolution can shape the fate of long lived, vulnerable species in the face of climate change.
MDPI
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29437274
https://pub.uni-bielefeld.de/record/2943727
https://pub.uni-bielefeld.de/download/2943727/2943742
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/genes11050588
info:eu-repo/semantics/altIdentifier/issn/2073-4425
info:eu-repo/semantics/altIdentifier/wos/000542276700110
info:eu-repo/semantics/altIdentifier/pmid/32466335
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2942010
2020-10-06T11:20:29Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Reproduction affects immune defenses in the guinea pig even under ad libitum food
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Guenther, Anja
Jäckel, Manuela
Czirjak, Gabor A
ddc:590
Trillmich F, Guenther A, Jäckel M, Czirjak GA. Reproduction affects immune defenses in the guinea pig even under ad libitum food. <em>PloS one</em>. 2020;15(3): e0230081.
Reproduction is one of the costliest processes in the life of an animal. Life history theory assumes that when resources are limiting allocation to reproduction will reduce allocation to other essential processes thereby inducing costs of reproduction. The immune system is vital for survival. If reproduction reduces investment in immune function, this could increase the risk of disease, morbidity and mortality. We here test in the guinea pig, if even under ad libitum food conditions, pregnancy and lactation reduce the activity of the adaptive and innate immune system compared to the reaction of non-reproducing animals. In response to a challenge with keyhole limpet haemocyanin the antibody-mediated adaptive immunity during (pregnancy and) lactation was reduced. Pregnant and lactating females showed higher levels of bacterial killing activity, an integrated measure of innate immunity, than non-reproducing females. However, two major effectors of the innate immunity, the natural antibody and the complement of pregnant and lactating females showed lower levels than in non-reproducing females. Pregnant and lactating females did not differ significantly in the expressed levels of innate immunity. Our results indicate that changes in the immune response during reproduction are physiological adjustments to predictable allocation problems, because they happen even under ad libitum food availability.
Public Library of Science (PLoS)
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29420103
https://pub.uni-bielefeld.de/record/2942010
https://pub.uni-bielefeld.de/download/2942010/2942170
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0230081
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000535291800014
info:eu-repo/semantics/altIdentifier/pmid/32176718
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2941261
2021-07-07T14:34:34Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Comparison of morphological, DNA barcoding, and metabarcoding characterizations of freshwater nematode communities
Schenk, Janina ; https://orcid.org/0000-0002-9550-7503
Kleinbölting, Nils
Traunspurger, Walter
ddc:590
Schenk J, Kleinbölting N, Traunspurger W. Comparison of morphological, DNA barcoding, and metabarcoding characterizations of freshwater nematode communities. <em>Ecology and Evolution</em>. 2020;10(6): ece3.6104.
Biomonitoring approaches and investigations of many ecological questions require assessments of the biodiversity of a given habitat. Small organisms, ranging from protozoans to metazoans, are of great ecological importance and comprise a major share of the planet's biodiversity but they are extremely difficult to identify, due to their minute body sizes and indistinct structures. Thus, most biodiversity studies that include small organisms draw on several methods for species delimitation, ranging from traditional microscopy to molecular techniques. In this study, we compared the
efficiency of these methods by analyzing a community of nematodes. Specifically, we evaluated the performances of traditional morphological identification, single-specimen barcoding (Sanger sequencing), and metabarcoding in the identification of 1500 nematodes from sediment samples. The molecular approaches were based on the analysis of the 28S ribosomal large and 18S small subunits (LSU and SSU). The morphological analysis resulted in the determination of 22 nematode species. Barcoding identified a comparable number of operational taxonomic units (OTUs) based on 28S
rDNA (n = 20) and fewer OTUs based on 18S rDNA (n = 12). Metabarcoding identified a higher OTU number but fewer amplicon sequence variants (AVSs) (n = 48 OTUs, n = 17 ASVs for 28S rDNA, and n = 31 OTUs, n = 6 ASVs for 18S rDNA). Between the three approaches (morphology, barcoding, and metabarcoding), only three species (13.6%) were shared. This lack of taxonomic resolution hinders reliable community identifications to the species level. Further database curation will ensure the effective use of molecular species identification.
Wiley
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29412617
https://pub.uni-bielefeld.de/record/2941261
https://pub.uni-bielefeld.de/download/2941261/2941262
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/ece3.6104
info:eu-repo/semantics/altIdentifier/issn/2045-7758
info:eu-repo/semantics/altIdentifier/wos/000513378600001
info:eu-repo/semantics/altIdentifier/pmid/32211163
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2941263
2021-07-07T14:36:11Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Metabarcoding data allow for reliable biomass estimates in the most abundant animals on earth
Schenk, Janina ; https://orcid.org/0000-0002-9550-7503
Geisen, Stefan
Kleinbölting, Nils
Traunspurger, Walter
ddc:590
Schenk J, Geisen S, Kleinbölting N, Traunspurger W. Metabarcoding data allow for reliable biomass estimates in the most abundant animals on earth. <em>Metabarcoding and Metagenomics</em>. 2019;3: e46704.
Microscopic organisms are the dominant and most diverse organisms on Earth. Nematodes, as part of this microscopic diversity, are by far the most abundant animals and their diversity is equally high. Molecular metabarcoding is often applied to study the diversity of microorganisms, but has yet to become the standard to determine nematode communities. As such, the information metabarcoding provides, such as in terms of species coverage, taxonomic resolution and especially if sequence reads can be linked to the abundance or biomass of nematodes in a sample, has yet to be determined. Here, we applied metabarcoding using three primer sets located within ribosomal rRNA gene regions to target assembled mock-communities consisting of 18 different nematode species that we established in 9 different compositions. We determined abundances and biomass of all species added to examine if relative sequence abundance or biomass can be linked to relative sequence reads. We found that nematode communities are not equally represented by the three different primer sets and we found that relative read abundances almost perfectly correlated positively with relative species biomass for two of the primer sets. This strong biomass-read number correlation suggests that metabarcoding reads can reveal biomass information even amongst more complex nematode communities as present in the environment and possibly can be transferred to better study other groups of organisms. This biomass-read link is of particular importance for more reliably assessing nutrient flow through food-webs, as well as adjusting biogeochemical models through user-friendly and easily obtainable metabarcoding data.</jats:p>
Pensoft
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29412635
https://pub.uni-bielefeld.de/record/2941263
https://pub.uni-bielefeld.de/download/2941263/2941264
eng
info:eu-repo/semantics/altIdentifier/doi/10.3897/mbmg.3.46704
info:eu-repo/semantics/altIdentifier/issn/2534-9708
info:eu-repo/semantics/openAccess
https://rightsstatements.org/vocab/InC/1.0/
oai:pub.uni-bielefeld.de:2941327
2020-11-16T12:41:49Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Within-Family Environment and Cross-Fostering Stress Affect Behavior and Physiology in Wild Cavies (Cavia aperea)
Kraus, Sabine ; https://orcid.org/0000-0003-1946-6487
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
Günther, Anja
ddc:590
Kraus S, Trillmich F, Günther A. Within-Family Environment and Cross-Fostering Stress Affect Behavior and Physiology in Wild Cavies (Cavia aperea). <em>Frontiers in Psychology</em>. 2020;11: 178.
Stability of personality traits is well-documented for a wide variety of animals. However, previous results also suggest that behavioral phenotypes are plastic during early ontogeny and can be adaptively shaped to the social environment. In cavies (Cavia aperea), it has already been documented that the size at birth relative to siblings (size rank) greatly influences various behavioral and physiological traits that last at least until independence. The aim of the current study was (1) to investigate if behavioral and physiological differences between pups of the same litter persist until after independence and influence development long-lasting, (2) to determine the potential plasticity in response to changes in the early within-family environment by cross-fostering pups either to the same, a lower, or a higher size rank in a foster-family. We measured three behavioral traits (number of interactions with a novel object, distance moved in an open field, struggle docility) and two physiological traits (resting metabolic rate and basal cortisol levels). We predicted that cross-fostering into a litter where pups occupy the same size rank would not change the expression of traits. Cross-fostering to a different size rank should not influence the expression of traits if repeatability measures indicate low plasticity. Alternatively, if the traits are plastic, animals should adjust trait expression to fit with the size rank occupied in the foster litter. Initial differences in struggle docility, distance moved in an open field and in baseline cortisol concentration between pups of different size-ranks did not remain stable beyond independence. In addition, we found remarkable plasticity of the measured traits in response to cross-fostering to the same, a smaller or larger size-rank, suggesting that differences between pups are more the result of social constraints leading to adaptive shaping of individual phenotypes within a family. We also found a significant influence of the cross-fostering procedure itself. Cross-fostered individuals were less bold, grew slower and showed elevated resting metabolic rates. This finding suggests a cautious interpretation of previous cross-fostering studies and stresses the need for proper control groups to reliably separate the effect of cross-fostering per se from those induced by an experimental treatment.
Introduction
Frontiers Media
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29413273
https://pub.uni-bielefeld.de/record/2941327
https://pub.uni-bielefeld.de/download/2941327/2941328
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fpsyg.2020.00178
info:eu-repo/semantics/altIdentifier/issn/1664-1078
info:eu-repo/semantics/altIdentifier/wos/000517996800001
info:eu-repo/semantics/altIdentifier/pmid/32116966
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2944633
2021-07-07T14:38:07Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Nematodes as bioindicators of polluted sediments using metabarcoding and microscopic taxonomy
Schenk, Janina ; https://orcid.org/0000-0002-9550-7503
Höss, Sebastian
Brinke, Marvin
Kleinbölting, Nils
Brüchner-Hüttemann, Henrike
Traunspurger, Walter
General Environmental Science
ddc:590
Schenk J, Höss S, Brinke M, Kleinbölting N, Brüchner-Hüttemann H, Traunspurger W. Nematodes as bioindicators of polluted sediments using metabarcoding and microscopic taxonomy. <em>Environment International</em>. 2020;143: 105922.
The use of bioindicator species is a widely applied approach to evaluate ecological conditions, and several indices have been designed for this purpose. To assess the impact of pollution, especially in sediments, a pollution-sensitive index based on nematodes, one of the most abundant and species-rich groups of metazoa, was developed. The NemaSPEAR[%] index in its original form relies on the morphological inspection of nematode species. The application of a morphologically based NemaSPEAR[%] at the genus-level was previously validated. The present study evaluated a NemaSPEAR[%] index based on metabarcoding of nematode communities and tested the potential of fragments from the 28S rDNA, 18S rDNA and cytochrome c oxidase subunit I (COI) genes. In general, molecular-based results tended to show a poorer condition than morphology-based results for the investigated sites. At the genus level, NemaSPEAR[%] values based on morphological data strongly correlated with those based on molecular data for both the 28S rDNA and the 18S rDNA gene fragments (R2 = 0.86 and R2 = 0.74, respectively). Within the dominant genera (>3%) identified by morphology, 68% were detected by at least one of the two ribosomal markers. At the species level, however, concordance was less pronounced, as there were several deviations of the molecular from the morphological data. These differences could mostly be attributed to shortcomings in the reference database used in the molecular-based assignments. Our pilot study shows that a molecularly based, genus-level NemaSPEAR[%] can be successfully applied to evaluate polluted sediment. Future studies need to validate this approach further, e.g. with bulk extractions of whole meiofaunal communities in order to circumvent time-consuming nematode isolation. Further database curation with abundant NemaSPEAR[%] species will also increase the applicability of this approach.
Elsevier
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29446336
https://pub.uni-bielefeld.de/record/2944633
https://pub.uni-bielefeld.de/download/2944633/2944634
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.envint.2020.105922
info:eu-repo/semantics/altIdentifier/issn/0160-4120
info:eu-repo/semantics/altIdentifier/wos/000601333600007
info:eu-repo/semantics/altIdentifier/pmid/32663713
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2945207
2020-10-06T11:20:31Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Moving in the Dark-Evidence for an Influence of Artificial Light at Night on the Movement Behaviour of European Hedgehogs (Erinaceus europaeus).
Berger, Anne
Lozano, Briseida
Barthel, Leon M F
Schubert, Nadine
ddc:590
Berger A, Lozano B, Barthel LMF, Schubert N. Moving in the Dark-Evidence for an Influence of Artificial Light at Night on the Movement Behaviour of European Hedgehogs (Erinaceus europaeus). <em>Animals</em>. 2020;10(8): 1306.
With urban areas growing worldwide comes an increase in artificial light at night (ALAN), causing a significant impact on wildlife behaviour and its ecological relationships. The effects of ALAN on nocturnal and protected European hedgehogs (Erinaceus europaeus) are unknown but their identification is important for sustainable species conservation and management. In a pilot study, we investigated the influence of ALAN on the natural movement behaviour of 22 hedgehogs (nine females, 13 males) in urban environments. Over the course of four years, we equipped hedgehogs at three different study locations in Berlin with biologgers to record their behaviour for several weeks. We used Global Positioning System (GPS) tags to monitor their spatial behaviour, very high-frequency (VHF) loggers to locate their nests during daytime, and accelerometers to distinguish between active and passive behaviours. We compared the mean light intensity of the locations recorded when the hedgehogs were active with the mean light intensity of simulated locations randomly distributed in the individual's home range. We were able to show that the ALAN intensity of the hedgehogs' habitations was significantly lower compared to the simulated values, regardless of the animal's sex. This ALAN-related avoidance in the movement behaviour can be used for applied hedgehog conservation.
MDPI
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29452078
https://pub.uni-bielefeld.de/record/2945207
https://pub.uni-bielefeld.de/download/2945207/2945221
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/ani10081306
info:eu-repo/semantics/altIdentifier/issn/2076-2615
info:eu-repo/semantics/altIdentifier/wos/000564712200001
info:eu-repo/semantics/altIdentifier/pmid/32751525
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2945238
2023-04-19T13:30:49Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The ability to get everywhere: dispersal modes of free-living, aquatic nematodes
Ptatscheck, Christoph
Traunspurger, Walter
Aquatic Science
Pollution
General Environmental Science
ddc:590
Ptatscheck C, Traunspurger W. The ability to get everywhere: dispersal modes of free-living, aquatic nematodes. <em>Hydrobiologia</em>. 2020;847:3519-3547.
Nematodes colonize almost all aquatic habitats worldwide. Despite their small size, restricted locomotion and lack of pelagic larvae, they can reach even isolated habitats within a short time. In this review, we examine the underlying dispersal modes, considering their active movement in substrates and water, their drift by water and wind, rafting, zoochory as well as human-mediated vectors. These modes are limited by morphology and habitat structure, ecological factors and especially by hydrodynamics. Active dispersal is effective over short distances, but with increasing water-flow velocity, passive dispersal modes, which enable long-range transfer, become important. In fact, the transport of nematodes over thousands of kilometers via ship water tanks and by hitchhiking on sea turtles has been documented. Overland dispersal vectors include wind and birds whereas rafting enables an aggregated distribution because food is available, and reproduction is possible onboard the rafts. The diversity of possible dispersal modes is high and offers a reasonably chance for gravid females or groups of nematodes to be transferred even to remote environments. Their immigration is continuous, and supported by their rapid, parthenogenetic reproduction, nematodes are effective pioneers with the ability to (re)colonize new or disturbed habitats or rebalance already existing communities.
Springer
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29452386
https://pub.uni-bielefeld.de/record/2945238
https://pub.uni-bielefeld.de/download/2945238/2945925
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10750-020-04373-0
info:eu-repo/semantics/altIdentifier/issn/0018-8158
info:eu-repo/semantics/altIdentifier/issn/1573-5117
info:eu-repo/semantics/altIdentifier/wos/000558627300003
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2939367
2024-01-25T08:18:19Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Early life starvation has stronger intra-generational than transgenerational effects on key life-history traits and consumption measures in a sawfly
Paul, Sarah Catherine
Putra, Rocky ; https://orcid.org/0000-0003-2044-0081
Müller, Caroline
ddc:590
Paul SC, Putra R, Müller C. Early life starvation has stronger intra-generational than transgenerational effects on key life-history traits and consumption measures in a sawfly. <em>PloS One</em>. 2019;14(12): e0226519.
Resource availability during development shapes not only adult phenotype but also the phenotype of subsequent offspring. When resources are absent and periods of starvation occur in early life, such developmental stress often influences key life-history traits in a way that benefits individuals and their offspring when facing further bouts of starvation. Here we investigated the impacts of different starvation regimes during larval development on life-history traits and measures of consumption in the turnip sawfly, Athalia rosae (Hymenoptera: Tenthredinidae). We then assessed whether offspring of starved and non-starved parents differed in their own life-history if reared in conditions that either matched that of their parents or were a mismatch. Early life starvation effects were more pronounced within than across generations in A. rosae, with negative impacts on adult body mass and increases in developmental time, but no effects on adult longevity in either generation. We found some evidence of higher growth rates in larvae having experienced starvation, although this did not ameliorate the overall negative effect of larval starvation on adult size. However, further work is necessary to disentangle the effects of larval size and instar from those of starvation treatment. Finally, we found weak evidence for transgenerational effects on larval growth, with intra-generational larval starvation experience being more decisive for life-history traits. Our study demonstrates that intra-generational effects of starvation are stronger than transgenerational effects on life-history traits and consumption measures in A. rosae.
Public Library of Science
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29393678
https://pub.uni-bielefeld.de/record/2939367
https://pub.uni-bielefeld.de/download/2939367/2939900
eng
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0226519
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/issn/1932-6203
info:eu-repo/semantics/altIdentifier/wos/000534249400043
info:eu-repo/semantics/altIdentifier/pmid/31856200
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2936824
2020-11-09T16:07:10Z
journal_article
doc-type:article
ddc:370
ddc:590
journal_articleFtxt
open_access
Der Totenkopfschwärmer im Biologieunterricht. Die Aufzucht des Totenkopfschwärmers (Acherontia atropos) im Klassenzimmer
Nolding, Jana ; https://orcid.org/0000-0002-5498-1794
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
ddc:370
ddc:590
Nolding J, Grotjohann N. Der Totenkopfschwärmer im Biologieunterricht. Die Aufzucht des Totenkopfschwärmers (Acherontia atropos) im Klassenzimmer . <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2019;2(3): 4.
In diesem Beitrag wird die Zucht des Totenkopfschwärmers im Biologieunterricht beschrieben. Mit Hilfe dieses Schmetterlings soll den Schülerinnen und Schülern die holometabole Metamorphose der Schmetterlinge nähergebracht werden.
Universität Bielefeld. Fakultät für Biologie,Biologiedidaktik
2019
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29368244
https://pub.uni-bielefeld.de/record/2936824
https://pub.uni-bielefeld.de/download/2936824/2948588
deu
info:eu-repo/semantics/altIdentifier/doi/10.4119/bupraktisch-1548
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2940638
2020-01-30T13:32:28Z
research_data
doc-type:ResearchData
ddc:590
research_dataFtxt
open_access
Within-family environment and cross-fostering stress affect behaviour and physiology in wild cavies (Cavia aperea)
Trillmich, Fritz ; https://orcid.org/0000-0003-4816-1156
personality
early development
individual differences
family effects
cross-fostering
developmental plasticity
rank size
ddc:590
Trillmich F. <em>Within-family environment and cross-fostering stress affect behaviour and physiology in wild cavies (Cavia aperea)</em>. Bielefeld University; 2020.
Data and R-script to the publication
Within-family environment and cross-fostering stress affect behaviour and physiology in wild cavies (Cavia aperea)
to appear in Frontiers in Psychology
Bielefeld University
2020
http://purl.org/coar/resource_type/c_ddb1
info:eu-repo/semantics/other
doc-type:ResearchData
text
https://pub.uni-bielefeld.de/record/2940638
https://pub.uni-bielefeld.de/download/2940638/2940643
https://pub.uni-bielefeld.de/download/2940638/2940644
info:eu-repo/semantics/altIdentifier/doi/10.4119/unibi/2940638
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2945727
2023-04-19T14:11:23Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Meiofauna in stream habitats: temporal dynamics of abundance, biomass and secondary production in different substrate microhabitats in a first-order stream
Brüchner-Hüttemann, Henrike
Ptatscheck, Christoph
Traunspurger, Walter
Aquatic Science
Ecology
Evolution
Behavior and Systematics
General Agricultural and Biological Sciences
ddc:590
Brüchner-Hüttemann H, Ptatscheck C, Traunspurger W. Meiofauna in stream habitats: temporal dynamics of abundance, biomass and secondary production in different substrate microhabitats in a first-order stream. <em>Aquatic Ecology</em>. 2020;54:1079-1095.
Meiofaunal abundance, biomass and secondary production were investigated over 13 months in an unpolluted first-order stream. Four microhabitats were considered: sediment and the biofilms on dead wood, macrophytes and leaf litter. The relative contribution of the microhabitats to secondary production and the influence of environmental factors on meiofaunal density distribution were estimated. We expected (1) meiofaunal abundance and biomass to exhibit seasonal patterns, with more pronounced seasonal fluctuations on macrophytes and leaf litter than in the other microhabitats, (2) annual secondary production to be highest in sediment; however, the relative contribution of the microhabitats to monthly secondary production would change during the year, and (3) a bottom-up driven influence on meiofaunal density distribution in the microhabitats. Meiofaunal annual mean abundance, biomass and secondary production were 7–14 times higher in sediment and on dead wood than on macrophytes and leaf litter. Significant seasonal patterns described the meiofaunal abundance in sediment and on leaf litter as well as the biomass in sediment, on macrophytes and leaf litter. Organisms in sediment and on dead wood contributed 48 and 43%, respectively, to secondary production m−2, but in regard to the stream area covered by the microhabitats, sediment had the highest share (80%). Significant determinants of the density distribution were AFDM, protozoans, bacteria and Chl-a, which influenced all meiofaunal groups. Our study clearly indicates that meiofaunal organisms in sediment and on dead wood have a remarkable share on total secondary production of lotic systems which is especially relevant for forested low-order streams.
Springer Nature
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29457275
https://pub.uni-bielefeld.de/record/2945727
https://pub.uni-bielefeld.de/download/2945727/2949149
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10452-020-09795-5
info:eu-repo/semantics/altIdentifier/issn/1386-2588
info:eu-repo/semantics/altIdentifier/issn/1573-5125
info:eu-repo/semantics/altIdentifier/wos/000566364000001
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2954246
2023-01-03T08:17:04Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Between Fate Choice and Self-Renewal - Heterogeneity of Adult Neural Crest-Derived Stem Cells
Höving, Anna L.
Windmöller, Beatrice Ariane
Knabbe, Cornelius
Kaltschmidt, Barbara
Kaltschmidt, Christian
Greiner, Johannes ; https://orcid.org/0000-0002-0524-662X
ddc:570
ddc:590
Höving AL, Windmöller BA, Knabbe C, Kaltschmidt B, Kaltschmidt C, Greiner J. Between Fate Choice and Self-Renewal - Heterogeneity of Adult Neural Crest-Derived Stem Cells. <em>Frontiers in Cell and Developmental Biology</em>. 2021;9: 662754.
Stem cells of the neural crest (NC) vitally participate to embryonic development, but also remain in distinct niches as quiescent neural crest-derived stem cell (NCSC) pools into adulthood. Although NCSC-populations share a high capacity for self-renewal and differentiation resulting in promising preclinical applications within the last two decades, inter- and intrapopulational differences exist in terms of their expression signatures and regenerative capability. Differentiation and self-renewal of stem cells in developmental and regenerative contexts are partially regulated by the niche or culture condition and further influenced by single cell decision processes, making cell-to-cell variation and heterogeneity critical for understanding adult stem cell populations. The present review summarizes current knowledge of the cellular heterogeneity within NCSC-populations located in distinct craniofacial and trunk niches including the nasal cavity, olfactory bulb, oral tissues or skin. We shed light on the impact of intrapopulational heterogeneity on fate specifications and plasticity of NCSCs in their niches<em>in vivo</em>as well as during<em>in vitro</em>culture. We further discuss underlying molecular regulators determining fate specifications of NCSCs, suggesting a regulatory network including NF-κB and NC-related transcription factors like SLUG and SOX9 accompanied by Wnt- and MAPK-signaling to orchestrate NCSC stemness and differentiation. In summary, adult NCSCs show a broad heterogeneity on the level of the donor and the donors’ sex, the cell population and the single stem cell directly impacting their differentiation capability and fate choices<em>in vivo</em>and<em>in vitro</em>. The findings discussed here emphasize heterogeneity of NCSCs as a crucial parameter for understanding their role in tissue homeostasis and regeneration and for improving their applicability in regenerative medicine.
Frontiers Media SA
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29542461
https://pub.uni-bielefeld.de/record/2954246
https://pub.uni-bielefeld.de/download/2954246/2954261
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fcell.2021.662754
info:eu-repo/semantics/altIdentifier/issn/2296-634X
info:eu-repo/semantics/altIdentifier/wos/000641979100001
info:eu-repo/semantics/altIdentifier/pmid/33898464
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2955634
2024-01-23T11:53:39Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Social competition as a driver of phenotype–environment correlations: implications for ecology and evolution
Fokkema, Rienk W.
Korsten, Peter ; https://orcid.org/0000-0003-0814-9099
Schmoll, Tim
Wilson, Alastair J.
intraspecific competition phenotype–environment correlation fitness variation individual quality habitat quality adaptation microevolution indirect genetic effect (IGE) evolutionary stasis
ddc:570
ddc:590
Fokkema RW, Korsten P, Schmoll T, Wilson AJ. Social competition as a driver of phenotype–environment correlations: implications for ecology and evolution. <em>Biological Reviews</em>. 2021: brv.12768.
While it is universally recognised that environmental factors can cause phenotypic trait variation via phenotypic plasticity, the extent to which causal processes operate in the reverse direction has received less consideration. In fact individuals are often active agents in determining the environments, and hence the selective regimes, they experience. There are several important mechanisms by which this can occur, including habitat selection and niche construction, that are expected to result in phenotype–environment correlations (i.e. non-random assortment of phenotypes across heterogeneous environments). Here we highlight an additional mechanism – intraspecific competition for preferred environments – that may be widespread, and has implications for phenotypic evolution that are currently underappreciated. Under this mechanism, variation among individuals in traits determining their competitive ability leads to phenotype–environment correlation; more competitive phenotypes are able to acquire better patches. Based on a concise review of the empirical evidence we argue that competition-induced phenotype–environment correlations are likely to be common in natural populations before highlighting the major implications of this for studies of natural selection and microevolution. We focus particularly on two central issues. First, competition-induced phenotype–environment correlation leads to the expectation that positive feedback loops will amplify phenotypic and fitness variation among competing individuals. As a result of being able to acquire a better environment, winners gain more resources and even better phenotypes – at the expense of losers. The distinction between individual quality and environmental quality that is commonly made by researchers in evolutionary ecology thus becomes untenable. Second, if differences among individuals in competitive ability are underpinned by heritable traits, competition results in both genotype–environment correlations and an expectation of indirect genetic effects (IGEs) on resource-dependent life-history traits. Theory tells us that these IGEs will act as (partial) constraints, reducing the amount of genetic variance available to facilitate evolutionary adaptation. Failure to recognise this will lead to systematic overestimation of the adaptive potential of populations. To understand the importance of these issues for ecological and evolutionary processes in natural populations we therefore need to identify and quantify competition-induced phenotype–environment correlations in our study systems. We conclude that both fundamental and applied research will benefit from an improved understanding of when and how social competition causes non-random distribution of phenotypes, and genotypes, across heterogeneous environments.
Wiley
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29556344
https://pub.uni-bielefeld.de/record/2955634
https://pub.uni-bielefeld.de/download/2955634/2955635
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/brv.12768
info:eu-repo/semantics/altIdentifier/issn/1464-7931
info:eu-repo/semantics/altIdentifier/issn/1469-185X
info:eu-repo/semantics/altIdentifier/wos/000662836400001
info:eu-repo/semantics/altIdentifier/pmid/34145714
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2952754
2021-10-05T14:37:56Z
journal_article
doc-type:article
ddc:370
ddc:590
journal_articleFtxt
open_access
Empirische Annäherungen zu Anerkennung und pädagogischer Beziehung im Biologieunterricht. Empirische Hinweise aus der Perspektive der Biologiedidaktik
Wilde, Matthias ; https://orcid.org/0000-0002-1630-3263
ddc:370
ddc:590
Wilde M. Empirische Annäherungen zu Anerkennung und pädagogischer Beziehung im Biologieunterricht. Empirische Hinweise aus der Perspektive der Biologiedidaktik. <em>PraxisForschungLehrer*innenBildung. Zeitschrift für Schul- und Professionsentwicklung</em>. 2021;3(2):18-33.
Wissenschaftliche Einrichtung Oberstufen-Kolleg, Universität Bielefeld
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29527545
https://pub.uni-bielefeld.de/record/2952754
https://pub.uni-bielefeld.de/download/2952754/2957933
deu
info:eu-repo/semantics/altIdentifier/doi/10.11576/PFLB-4193
info:eu-repo/semantics/altIdentifier/issn/2629-5628
https://creativecommons.org/licenses/by-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2952639
2022-08-24T07:54:57Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Hyperosmolality in CHO Culture: Effects on cellular behavior and morphology
Romanova, Nadiya
Niemann, Tarek
Greiner, Johannes ; https://orcid.org/0000-0002-0524-662X
Kaltschmidt, Barbara
Kaltschmidt, Christian
Noll, Thomas ; https://orcid.org/0000-0003-0748-3423
ddc:570
ddc:590
Romanova N, Niemann T, Greiner J, Kaltschmidt B, Kaltschmidt C, Noll T. Hyperosmolality in CHO Culture: Effects on cellular behavior and morphology. <em>Biotechnology and Bioengineering</em>. 2021;118(6):2348-2359.
Exposure of Chinese hamster ovary cells (CHO) to highly concentrated feed solution during fed‐batch cultivation is known to result in an unphysiological osmolality increase (>300 mOsm/kg), affecting cell physiology and morphology. Extending previous observation on osmotic adaptation, the present study investigates for the first time potential effects of hyperosmolality on CHO cells on both population and single‐cell level. We intentionally exposed CHO cells to hyperosmolality of up to 545 mOsm/kg during fed‐batch cultivation. In concordance with existing research data, hyperosmolality‐exposed CHO cells showed a nearly triplicated volume accompanied by ablation of proliferation. On the molecular level, we observed a strong hyperosmolality‐dependent increase in mitochondrial activity in CHO cells compared to control. In contrast to mitochondrial activity, hyperosmolality‐dependent proliferation arrest of CHO cells was not accompanied by DNA accumulation or caspase‐3/7‐mediated apoptosis. Notably, we demonstrate for the first time a formation of up to eight multiple, small nuclei in single hyperosmolality‐stressed CHO cells. The here presented observations reveal previously unknown hyperosmolality‐dependent morphological changes in CHO cells and support existing data on the osmotic response in mammalian cells.
Wiley
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29526398
https://pub.uni-bielefeld.de/record/2952639
https://pub.uni-bielefeld.de/download/2952639/2956306
eng
info:eu-repo/semantics/altIdentifier/doi/10.1002/bit.27747
info:eu-repo/semantics/altIdentifier/issn/0006-3592
info:eu-repo/semantics/altIdentifier/issn/1097-0290
info:eu-repo/semantics/altIdentifier/wos/000633541500001
info:eu-repo/semantics/altIdentifier/pmid/33751545
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2949051
2021-06-30T14:14:40Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Family matters: skin microbiome reflects the social group and spatial proximity in wild zebra finches
Engel, Kathrin
Pankoke, Helga
Jünemann, Sebastian
Brandl, Hanja B.
Sauer, Jan
Griffith, Simon
Kalinowski, Jörn
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
Ecology
Evolution
Behavior and Systematics
General Environmental Science
ddc:590
Engel K, Pankoke H, Jünemann S, et al. Family matters: skin microbiome reflects the social group and spatial proximity in wild zebra finches. <em>BMC Ecology</em>. 2020;20(1): 58.
Background
So far, large numbers of studies investigating the microbiome have focused on gut microbiota and less have addressed the microbiome of the skin. Especially in avian taxa our understanding of the ecology and function of these bacteria remains incomplete. The involvement of skin bacteria in intra-specific communication has recently received attention, and has highlighted the need to understand what information is potentially being encoded in bacterial communities. Using next generation sequencing techniques, we characterised the skin microbiome of wild zebra finches, aiming to understand the impact of sex, age and group composition on skin bacteria communities. For this purpose, we sampled skin swabs from both sexes and two age classes (adults and nestlings) of 12 different zebra finch families and analysed the bacterial communities.
Results
Using 16S rRNA sequencing we found no effect of age, sex and family on bacterial diversity (alpha diversity). However, when comparing the composition (beta diversity), we found that animals of social groups (families) harbour highly similar bacterial communities on their skin with respect to community composition. Within families, closely related individuals shared significantly more bacterial taxa than non-related animals. In addition, we found that age (adults vs. nestlings) affected bacterial composition. Finally, we found that spatial proximity of nest sites, and therefore individuals, correlated with the skin microbiota similarity.
Conclusions
Birds harbour very diverse and complex bacterial assemblages on their skin. These bacterial communities are distinguishable and characteristic for intraspecific social groups. Our findings are indicative for a family-specific skin microbiome in wild zebra finches. Genetics and the (social) environment seem to be the influential factors shaping the complex bacterial communities. Bacterial communities associated with the skin have a potential to emit volatiles and therefore these communities may play a role in intraspecific social communication, e.g. via signalling social group membership.
Springer Nature
2020
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29490510
https://pub.uni-bielefeld.de/record/2949051
https://pub.uni-bielefeld.de/download/2949051/2949052
eng
info:eu-repo/semantics/altIdentifier/doi/10.1186/s12898-020-00326-2
info:eu-repo/semantics/altIdentifier/issn/1472-6785
info:eu-repo/semantics/altIdentifier/wos/000594122700001
info:eu-repo/semantics/altIdentifier/pmid/33187490
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2950335
2023-04-19T14:17:35Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
Brüchner-Hüttemann, Henrike
Höss, Sebastian
Ptatscheck, Christoph
Brinke, Marvin
Schenk, Janina ; https://orcid.org/0000-0002-9550-7503
Traunspurger, Walter
ddc:590
Brüchner-Hüttemann H, Höss S, Ptatscheck C, Brinke M, Schenk J, Traunspurger W. Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments. <em>Ecological Indicators</em>. 2021;121: 107015.
Assessments of the ecological status of freshwater ecosystems, such as mandated by the EU Water Framework
Directive, are routinely conducted by monitoring macroinvertebrates. However, for the quality assessment of fine
sediments, macroinvertebrates are of limited suitability. In such habitats they show a low species diversity and
often low densities, whereas a more diverse meiofauna can be found. Among the meiofaunal groups in benthic
habitats, nematodes are one of the most abundant and species-rich. Fine, cohesive sediments considerably
contribute to many ecosystem services, but they are often hotspots of chemical contamination as well. In the
present study, the added value of the recently developed and validated NemaSPEAR[%]-index was evaluated by
directly comparing it to routinely used macrofauna-based indices. Macrofaunal and nematode communities were
synchronously monitored at seven sites in six different streams. The results of a chemical analysis of sediment
pollutants combined with sediment quality guidelines revealed widely diverging toxic potentials at the seven
investigated locations. The seasonal robustness of the NemaSPEAR[%]-index compared with macrofauna-based
indices was also determined, by additionally obtaining synchronous samples of macrofauna and nematodes over
the course of one year at one of the seven sites, a reference stream with very low toxic potential.
The NemaSPEAR[%] performed robustly despite seasonal variations in the nematode community in the
sediment of the unpolluted stream. At the seven sampling sites, representing a pollution gradient, the Nem-
aSPEAR[%]-index correlated well with the toxic potential of the sediments. By contrast, the macrofauna-based
indices did not correlate significantly with either the toxic potential of the sediments or with the results of
NemaSPEAR[%] at the seven sites. For many non– endobenthic macroinvertebrates, chemical exposure is mostly
through the water phase, such that the toxic potential of the sediments will not necessarily be reflected directly
by macrofaunal indices. Accordingly, identifying the stressors that contribute to degrading the ecological status
of a water body requires the inclusion of methods that examine different types of stressors, targets, and exposure
pathways. Our study shows that the NemaSPEAR[%]-index provides added value to routinely used macrofaunal-
based indices.
Elsevier
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29503357
https://pub.uni-bielefeld.de/record/2950335
https://pub.uni-bielefeld.de/download/2950335/2950336
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ecolind.2020.107015
info:eu-repo/semantics/altIdentifier/issn/1470-160X
info:eu-repo/semantics/altIdentifier/wos/000604882200008
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2951630
2021-04-13T12:50:30Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The Gut Microbial Composition Is Species-Specific and Individual-Specific in Two Species of Estrildid Finches, the Bengalese Finch and the Zebra Finch
Maraci, Öncü
Antonatou-Papaioannou, Anna
Jünemann, Sebastian
Castillo, Omar
Busche, Tobias
Kalinowski, Jörn
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
ddc:590
Maraci Ö, Antonatou-Papaioannou A, Jünemann S, et al. The Gut Microbial Composition Is Species-Specific and Individual-Specific in Two Species of Estrildid Finches, the Bengalese Finch and the Zebra Finch. <em>Frontiers in Microbiology</em>. 2021;12: 619141.
Microbial communities residing in the gastrointestinal tracts of animals have profound impacts on the physiological processes of their hosts. In humans, host-specific and environmental factors likely interact together to shape gut microbial communities, resulting in remarkable inter-individual differences. However, we still lack a full understanding of to what extent microbes are individual-specific and controlled by host-specific factors across different animal taxa. Here, we document the gut microbial characteristics in two estrildid finch species, the Bengalese finch (Lonchura striata domestica) and the zebra finch (Taeniopygia guttata) to investigate between-species and within-species differences. We collected fecal samples from breeding pairs that were housed under strictly controlled environmental and dietary conditions. All individuals were sampled at five different time points over a range of 120 days covering different stages of the reproductive cycle. We found significant species-specific differences in gut microbial assemblages. Over a period of 3 months, individuals exhibited unique, individual-specific microbial profiles. Although we found a strong individual signature in both sexes, within-individual variation in microbial communities was larger in males of both species. Furthermore, breeding pairs had more similar microbial profiles, compared to randomly chosen males and females. Our study conclusively shows that host-specific factors contribute structuring of gut microbiota.
Frontiers Media
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29516300
https://pub.uni-bielefeld.de/record/2951630
https://pub.uni-bielefeld.de/download/2951630/2952157
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmicb.2021.619141
info:eu-repo/semantics/altIdentifier/issn/1664-302X
info:eu-repo/semantics/altIdentifier/wos/000625818200001
info:eu-repo/semantics/altIdentifier/pmid/33679641
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2956862
2023-06-19T12:29:26Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Analysis of Several Pathways for Efficient Killing of Prostate Cancer Stem Cells: A Central Role of NF-κB RELA
Witte, Kaya
Pfitzenmaier, Jesco
Storm, Jonathan
Lütkemeyer, Melanie
Wimmer, Clara
Schulten, Wiebke
Czaniera, Nele
Geisler, Marvin
Förster, Christine
Wilkens, Ludwig
Knabbe, Cornelius
Mertzlufft, Fritz
Kaltschmidt, Barbara
Schulte am Esch, Jan
Kaltschmidt, Christian
prostate cancer
cancer stem cells
nuclear factor “kappa-light-chain-enhancer” of acti-vated B-cells
tumor necrosis factor
interferon gamma
immune checkpoint therapy
programmedcell death 1 ligand 1 and -ligand 2
natural killer cells
major histocompatibility complex class
ddc:590
Witte K, Pfitzenmaier J, Storm J, et al. Analysis of Several Pathways for Efficient Killing of Prostate Cancer Stem Cells: A Central Role of NF-κB RELA. <em>International Journal of Molecular Sciences</em>. 2021;22(16): 8901.
Prostate cancer is a common cause of death worldwide. Here, we isolated cancer stem cells (CSCs) from four adenocarcinomas of the prostate (Gleason scores from 3 + 3 up to 4 + 5). CSCs were characterized by the expression of the stem cell markers TWIST, the epithelial cell adhesion molecule (EPCAM), the transcription factors SNAI1 (SNAIL) and SNAI2 (SLUG) and cancer markers such as CD44 and prominin-1 (CD133). All investigated CSC populations contained a fraction highly positive for aldehyde dehydrogenase (ALDH) function and displayed robust expressions of programmed cell death 1 (PD-1) ligands. Furthermore, we investigated immunotherapeutic approaches but had no success even with the clinically used PD-1 inhibitor pembrolizumab. In addition, we studied another death-inducing pathway via interferon gamma signaling and detected high-level upregulations of human leukocyte antigen A (HLA-A) and beta 2-microglobulin (B2M) with only moderate killing efficacy. To examine further killing mechanisms in prostate cancer stem cells (PCSCs), we analyzed NF-κB signaling. Surprisingly, two patient-specific populations of PCSCs were found: one with canonical NF-κB signaling and another one with blunted NF-κB activation, which can be efficiently killed by tumor necrosis factor (TNF). Thus, culturing of PCSCs and analysis of respective NF-κB induction potency after surgery might be a powerful tool for optimizing patient-specific treatment options, such as the use of TNF-inducing chemotherapeutics and/or NF-κB inhibitors.
MDPI AG
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29568625
https://pub.uni-bielefeld.de/record/2956862
https://pub.uni-bielefeld.de/download/2956862/2956863
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/ijms22168901
info:eu-repo/semantics/altIdentifier/issn/1422-0067
info:eu-repo/semantics/altIdentifier/wos/000689344700001
info:eu-repo/semantics/altIdentifier/pmid/34445612
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2956355
2021-08-02T08:55:54Z
journal_article
doc-type:article
ddc:370
ddc:570
ddc:590
journal_articleFtxt
open_access
Wissenserwerb mit Originalobjekten im Naturkundemuseum - Eine Pilotstudie
Polte, Sabrina
Wilde, Matthias ; https://orcid.org/0000-0002-1630-3263
ddc:370
ddc:570
ddc:590
Polte S, Wilde M. Wissenserwerb mit Originalobjekten im Naturkundemuseum - Eine Pilotstudie. <em>Zeitschrift für Didaktik der Biologie</em>. 2021;25:78–86.
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29563552
https://pub.uni-bielefeld.de/record/2956355
https://pub.uni-bielefeld.de/download/2956355/2956516
deu
info:eu-repo/semantics/altIdentifier/doi/10.11576/zdb-4606
info:eu-repo/semantics/altIdentifier/issn/2627-7255
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2956821
2023-05-08T08:56:54Z
research_data
doc-type:ResearchData
ddc:590
research_dataFtxt
open_access
Data and code from: Olfactory camouflage and communication in birds
Grieves, Leanne A.
Gilles, Marc ; https://orcid.org/0000-0003-4222-9754
Cuthill, Innes C.
Szekely, Tamas
MacDougall-Shackleton, Elizabeth A.
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
Bird odor
chemical cues
infochemicals
mate recognition
olfaction
parental care
preen oil
scent
sexual selection
uropygial gland secretion
ddc:590
Grieves LA, Gilles M, Cuthill IC, Szekely T, MacDougall-Shackleton EA, Caspers B. <em>Data and code from: Olfactory camouflage and communication in birds</em>. Bielefeld University; 2022.
### Olfactory camouflage and communication in birds
##### Leanne A. Grieves, Marc Gilles, Innes C. Cuthill, Tamás Székely, Elizabeth A. MacDougall-Shackleton, Barbara A. Caspers
***
### Overview of the repository content
##### **Supplementary tables**
* **`TableS1_InclusionStudiesReview.xlsx`** *Table S1.* Studies included in the literature review of seasonal and sex differences in preen oil chemical composition.
* **`TableS2_InclusionSpeciesAnalysis.xslx`** *Table S2.* Occurrences (i.e., sex in each species or season in each species) included in the analyses of seasonal and sex differences in preen oil chemical composition.
##### **Data and code for comparative analyses on seasonal and sex differences in preen oil composition**
* **`data_season.csv`** and **`data_sex.csv`** contain the raw data needed to re-run analyses.
* **`data_phylo.nex`** contains the raw phylogenetic data obtained from birdtree.org.
* **`season_analysis_Rmd.pdf`** and **`season_analysis_Rmd.Rmd`** contain the R code to re-run the analysis on seasonal differences.
* **`sex_analysis_Rmd.pdf`** and **`sex_analysis_Rmd.Rmd`** contains the R code to re-run the analysis on sex differences.
##### **Data and code for details on the studies and species included in the review and analyses**
* **`inclusion_studies_review.csv`** contains data on the review process and the studies included in the review (i.e. Table S1).
* **`inclusion_species_1row1studywithinspecies.csv`** contains data on the occurrences (i.e., sex in each species or season in each species; multiple rows per species) included in the analyses (i.e. Table S2).
* **`inclusion_species_1row1species.csv`** contains data on the species (one row per species) included in the analyses.
* **`review_Rscript.R`** contains the R code to get all details about the studies and species included in the review and analyses.
##### **Additional files**
* All Excel files ending with **`_description.xlsx`** contain an additional sheet with a detailed description of the different variables.
* **`data_evolutionstudies.xlsx`** contains the data on the evolution of the studies on preen oil composition (i.e. Figure 1).
***
Bielefeld University
2022
http://purl.org/coar/resource_type/c_ddb1
info:eu-repo/semantics/other
doc-type:ResearchData
text
https://pub.uni-bielefeld.de/record/2956821
https://pub.uni-bielefeld.de/download/2956821/2956822
https://pub.uni-bielefeld.de/download/2956821/2956823
https://pub.uni-bielefeld.de/download/2956821/2956824
https://pub.uni-bielefeld.de/download/2956821/2956825
https://pub.uni-bielefeld.de/download/2956821/2956826
https://pub.uni-bielefeld.de/download/2956821/2956827
https://pub.uni-bielefeld.de/download/2956821/2956828
https://pub.uni-bielefeld.de/download/2956821/2956829
https://pub.uni-bielefeld.de/download/2956821/2956830
https://pub.uni-bielefeld.de/download/2956821/2956831
https://pub.uni-bielefeld.de/download/2956821/2956832
https://pub.uni-bielefeld.de/download/2956821/2956833
https://pub.uni-bielefeld.de/download/2956821/2956834
https://pub.uni-bielefeld.de/download/2956821/2956835
https://pub.uni-bielefeld.de/download/2956821/2956836
https://pub.uni-bielefeld.de/download/2956821/2956837
https://pub.uni-bielefeld.de/download/2956821/2956838
https://pub.uni-bielefeld.de/download/2956821/2956839
https://pub.uni-bielefeld.de/download/2956821/2956840
https://pub.uni-bielefeld.de/download/2956821/2956841
info:eu-repo/semantics/altIdentifier/doi/10.4119/unibi/2956821
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2962035
2023-10-12T13:12:57Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Endometrial Cancer Stem Cells: Where Do We Stand and Where Should We Go?
Banz-Jansen, Constanze
Helweg, Laureen ; https://orcid.org/0000-0003-3520-0558
Kaltschmidt, Barbara
endometrial cancer
cancer stem cells
endometrial cancer stem cells
MYC
NF-κB
PD-1
PD-L1
mitochondria
ddc:590
Banz-Jansen C, Helweg L, Kaltschmidt B. Endometrial Cancer Stem Cells: Where Do We Stand and Where Should We Go? <em> International Journal of Molecular Sciences</em>. 2022;23(6): 3412.
Endometrial cancer is one of the most common malignant diseases in women worldwide, with an incidence of 5.9%. Thus, it is the most frequent cancer of the female genital tract, with more than 34,000 women dying, in Europe and North America alone. Endometrial Cancer Stem Cells (CSC) might be drivers of carcinogenesis as well as metastatic and recurrent disease. Therefore, targeting CSCs is of high interest to improve prognosis of patients suffering of advanced or recurrent endometrial cancer. This review describes the current evidence of molecular mechanisms in endometrial CSCs with special emphasis on MYC and NF-kappaB signaling as well as mitochondrial metabolism. Furthermore, the current status of immunotherapy targeting PD-1 and PD-L1 in endometrial cancer cells and CSCs is elucidated. The outlined findings encourage novel therapies that target signaling pathways in endometrial CSCs as well as immunotherapy as a promising therapeutic approach in the treatment of endometrial cancer to impede cancer progression and prevent recurrence.
MDPI
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29620356
https://pub.uni-bielefeld.de/record/2962035
https://pub.uni-bielefeld.de/download/2962035/2962284
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/ijms23063412
info:eu-repo/semantics/altIdentifier/issn/1422-0067
info:eu-repo/semantics/altIdentifier/wos/000775243400001
info:eu-repo/semantics/altIdentifier/pmid/35328833
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2962818
2022-09-15T10:28:16Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Plumage and Fat Condition Scores as Well-Being Assessment Indicators in a Small Passerine Bird, the Zebra Finch (Taeniopygia guttata)
Kalnins, Lisa
Krüger, Oliver
Krause, Tobias ; https://orcid.org/0000-0002-8327-3711
ddc:590
Kalnins L, Krüger O, Krause T. Plumage and Fat Condition Scores as Well-Being Assessment Indicators in a Small Passerine Bird, the Zebra Finch (Taeniopygia guttata). <em>Frontiers in Veterinary Science </em>. 2022;9: 791412.
The well-being of animals kept by humans in laboratories, farms, or as pets should always be of the highest importance, and a prerequisite for this is adequate housing. To assess the potential indicators for animal well-being, ideally simple, non-invasive, and reliable methods are necessary. Here, we propose a novel plumage scoring system for small songbirds, using the example of the Zebra Finch, and examine its reliability in comparison with a well-known body condition index, that is, the fat score. We used up to five different observers of different experience levels to assess inter- and intra-observer reliability of the proposed plumage score and also the fat score. We found substantial inter-observer reliability for the proposed novel plumage score, and lower inter-observer reliability for the fat score, which seems to require more training of observers. The intra-observer reliability of the experienced observer who trained the others also showed a very strong reliability for the plumage score and for the fat score. Thus, we conclude that our proposed novel plumage score is a simple, reliable, and non-invasive way to estimate an important indicator of captive Zebra Finches' well-being. Furthermore, the plumage score can be reliably taught to other observers. The plumage score, maybe in combination with the fat score, may be an important tool to reliably assess well-being on a regular basis in captive populations in zoos, laboratories, or pet stocks. Copyright © 2022 Kalnins, Kruger and Krause.
Frontiers Research Foundation
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29628180
https://pub.uni-bielefeld.de/record/2962818
https://pub.uni-bielefeld.de/download/2962818/2963530
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fvets.2022.791412
info:eu-repo/semantics/altIdentifier/issn/2297-1769
info:eu-repo/semantics/altIdentifier/wos/000808550000001
info:eu-repo/semantics/altIdentifier/pmid/35498744
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2961435
2022-04-14T14:02:51Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Human Sex Matters: Y-Linked Lysine Demethylase 5D Drives Accelerated Male Craniofacial Osteogenic Differentiation
Merten, Madlen
Greiner, Johannes ; https://orcid.org/0000-0002-0524-662X
Niemann, Tarek
Grosse Venhaus, Meike
Kronenberg, Daniel
Stange, Richard
Wähnert, Dirk
Kaltschmidt, Christian
Vordemvenne, Thomas
Kaltschmidt, Barbara
adult human stem cells
sexual dimorphisms
osteogenic differentiation
KDM5D
calvarial bone regeneration
transcriptional profiling
KDOAM-25
ddc:590
Merten M, Greiner J, Niemann T, et al. Human Sex Matters: Y-Linked Lysine Demethylase 5D Drives Accelerated Male Craniofacial Osteogenic Differentiation. <em>Cells</em>. 2022;11(5): 823.
Female sex is increasingly associated with a loss of bone mass during aging and an increased risk of developing nonunion fractures. Hormonal factors and cell-intrinsic mechanisms are suggested to drive these sexual dimorphisms, although underlying molecular mechanisms are still a matter of debate. Here, we observed a decreased capacity of calvarial bone recovery in female rats and a profound sexually dimorphic osteogenic differentiation in human adult neural crest-derived stem cells (NCSCs). Next to an elevated expression of pro-osteogenic regulators, global transcriptomics revealed Lysine Demethylase 5D (KDM5D) to be highly upregulated in differentiating male NCSCs. Loss of function by siRNA or pharmacological inhibition of KDM5D significantly reduced the osteogenic differentiation capacity of male NCSCs. In summary, we demonstrated craniofacial osteogenic differentiation to be sexually dimorphic with the expression of KDM5D as a prerequisite for accelerated male osteogenic differentiation, emphasizing the analysis of sex-specific differences as a crucial parameter for treating bone defects.
MDPI AG
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29614357
https://pub.uni-bielefeld.de/record/2961435
https://pub.uni-bielefeld.de/download/2961435/2961436
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/cells11050823
info:eu-repo/semantics/altIdentifier/issn/2073-4409
info:eu-repo/semantics/altIdentifier/wos/000767784800001
info:eu-repo/semantics/altIdentifier/pmid/35269444
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2960810
2023-01-03T08:17:06Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Targeting NF-κB Signaling in Cancer Stem Cells: A Narrative Review
Kaltschmidt, Barbara
Witte, Kaya
Greiner, Johannes ; https://orcid.org/0000-0002-0524-662X
Weissinger, Florian
Kaltschmidt, Christian
cancer stem cells
NF-κB
EGF
PD-L1
lenalidomide
bortezomib
dexamethason
ddc:590
Kaltschmidt B, Witte K, Greiner J, Weissinger F, Kaltschmidt C. Targeting NF-κB Signaling in Cancer Stem Cells: A Narrative Review. <em>Biomedicines</em>. 2022;10(2): 261.
Among the cell populations existing within a tumor, cancer stem cells are responsible for metastasis formation and chemotherapeutic resistance. In the present review, we focus on the transcription factor NF-κB, which is present in every cell type including cancer stem cells. NF-κB is involved in pro-tumor inflammation by its target gene interleukin 1 (IL1) and can be activated by a feed-forward loop in an IL1-dependent manner. Here, we summarize current strategies targeting NF-κB by chemicals and biologicals within an integrated cancer therapy. Specifically, we start with a tyrosine kinase inhibitor targeting epidermal growth factor (EGF)-receptor-mediated phosphorylation. Furthermore, we summarize current strategies of multiple myeloma treatment involving lenalidomide, bortezomib, and dexamethasone as potential NF-κB inhibitors. Finally, we discuss programmed death-ligand 1 (PD-L1) as an NF-κB target gene and its role in checkpoint therapy. We conclude, that NF-κB inhibition by specific inhibitors of IκB kinase was of no clinical use but inhibition of upstream and downstream targets with drugs or biologicals might be a fruitful way to treat cancer stem cells.
MDPI AG
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29608107
https://pub.uni-bielefeld.de/record/2960810
https://pub.uni-bielefeld.de/download/2960810/2960811
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/biomedicines10020261
info:eu-repo/semantics/altIdentifier/issn/2227-9059
info:eu-repo/semantics/altIdentifier/wos/000778145800001
info:eu-repo/semantics/altIdentifier/pmid/35203471
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2961113
2023-05-08T08:56:54Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Olfactory camouflage and communication in birds
Grieves, Leanne A.
Gilles, Marc ; https://orcid.org/0000-0003-4222-9754
Cuthill, Innes C.
Székely, Tamás
MacDougall‐Shackleton, Elizabeth A.
Caspers, Barbara ; https://orcid.org/0000-0002-4380-0476
bird odour
chemical cues
infochemicals
mate recognition
olfaction
parental care
preen oil
scent
sexual selection
uropygial gland secretion
ddc:590
Grieves LA, Gilles M, Cuthill IC, Székely T, MacDougall‐Shackleton EA, Caspers B. Olfactory camouflage and communication in birds. <em>Biological Reviews</em>. 2022;97(3):1193-1209.
Smell is a sensory modality that is rarely considered in birds, but evidence is mounting that olfaction is an important aspect of avian behaviour and ecology. The uropygial gland produces an odoriferous secretion (preen oil) that can differ seasonally and between the sexes. These differences are hypothesized to function in olfactory camouflage, i.e. minimizing detection by nest predators (olfactory crypsis hypothesis), and/or intraspecific olfactory communication, particularly during breeding (sex semiochemical hypothesis). However, evidence for seasonal and sex differences in preen oil is mixed, with some studies finding differences and others not, and direct evidence for the putative function(s) of seasonal variation and sex differences in preen oil remains limited. We conducted a systematic review of the evidence for such changes in preen oil chemical composition, finding seasonal differences in 95% of species (57/60 species in 35 studies) and sex differences in 47% of species (28/59 species in 46 studies). We then conducted phylogenetic comparative analyses using data from 59 bird species to evaluate evidence for both the olfactory crypsis and sex semiochemical hypotheses. Seasonal differences were more likely in the incubating than non-incubating sex in ground-nesting species, but were equally likely regardless of incubation strategy in non-ground-nesting species. This result supports the olfactory crypsis hypothesis, if ground nesters are more vulnerable to olfactorily searching predators than non-ground nesters. Sex differences were more likely in species with uniparental than biparental incubation and during breeding than non-breeding, consistent with both the olfactory crypsis and sex semiochemical hypotheses. At present, the data do not allow us to disentangle these two hypotheses, but we provide recommendations that will enable researchers to do so.
Wiley
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29611131
https://pub.uni-bielefeld.de/record/2961113
https://pub.uni-bielefeld.de/download/2961113/2961115
https://pub.uni-bielefeld.de/download/2961113/2961116
https://pub.uni-bielefeld.de/download/2961113/2961117
https://pub.uni-bielefeld.de/download/2961113/2961118
https://pub.uni-bielefeld.de/download/2961113/2961119
https://pub.uni-bielefeld.de/download/2961113/2961120
eng
info:eu-repo/semantics/altIdentifier/doi/10.1111/brv.12837
info:eu-repo/semantics/altIdentifier/issn/1464-7931
info:eu-repo/semantics/altIdentifier/issn/1469-185X
info:eu-repo/semantics/altIdentifier/wos/000751752100001
info:eu-repo/semantics/altIdentifier/pmid/35128775
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2958723
2022-09-15T10:28:14Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
The Use of Supervised Learning Models in Studying Agonistic Behavior and Communication in Weakly Electric Fish
Pedraja, Federico
Herzog, Hendrik
Engelmann, Jacob ; https://orcid.org/0000-0002-1054-0938
Jung, Sarah Nicola
ddc:590
Pedraja F, Herzog H, Engelmann J, Jung SN. The Use of Supervised Learning Models in Studying Agonistic Behavior and Communication in Weakly Electric Fish. <em>Frontiers in Behavioral Neuroscience</em>. 2021;15: 718491.
Despite considerable advances, studying electrocommunication of weakly electric fish, particularly in pulse-type species, is challenging as very short signal epochs at variable intervals from a few hertz up to more than 100 Hz need to be assigned to individuals. In this study, we show that supervised learning approaches offer a promising tool to automate or semiautomate the workflow, and thereby allowing the analysis of much longer episodes of behavior in a reasonable amount of time. We provide a detailed workflow mainly based on open resource software. We demonstrate the usefulness by applying the approach to the analysis of dyadic interactions of Gnathonemus petersii. Coupling of the proposed methods with a boundary element modeling approach, we are thereby able to model the information gained and provided during agonistic encounters. The data indicate that the passive electrosensory input, in particular, provides sufficient information to localize a contender during the pre-contest phase, fish did not use or rely on the theoretically also available sensory information of the contest outcome-determining size difference between contenders before engaging in agonistic behavior. Copyright © 2021 Pedraja, Herzog, Engelmann and Jung.
Frontiers Media
2021
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29587237
https://pub.uni-bielefeld.de/record/2958723
https://pub.uni-bielefeld.de/download/2958723/2958881
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fnbeh.2021.718491
info:eu-repo/semantics/altIdentifier/issn/1662-5153
info:eu-repo/semantics/altIdentifier/wos/000712767700001
info:eu-repo/semantics/altIdentifier/pmid/34707485
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2965280
2022-09-19T09:33:53Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Male social niche conformance? Effects of manipulated opportunity for extra-pair mating on behavior and hormones of male zebra finches
Lilie, Navina ; https://orcid.org/0000-0002-3421-714X
Riyahi, Sepand ; https://orcid.org/0000-0003-3317-3576
Kalinowski, Arne
Salazar, Stephen ; https://orcid.org/0000-0002-5437-0280
Kaiser, Sylvia
Schmoll, Tim
Korsten, Peter ; https://orcid.org/0000-0003-0814-9099
ddc:590
Lilie N, Riyahi S, Kalinowski A, et al. Male social niche conformance? Effects of manipulated opportunity for extra-pair mating on behavior and hormones of male zebra finches. <em>Hormones and Behavior</em>. 2022;146: 105243.
Success in sperm competition is an important determinant of male fitness in mating systems with female multiple mating. Thus, sperm competition risk represents a key dimension of the male social environment to which individual males are expected to adaptively adjust their reproductive phenotype. Such adaptive phenotypic adjustment we here refer to as male social niche conformance. In this pre-registered study, we investigated how male zebra finches, _Taeniopygia guttata_, adjust their behavior to sperm competition risk. We experimentally manipulated the opportunity for extra-pair mating to create two levels of sperm competition risk: 1) Single-pair, no sperm competition risk; 2) Double-pair, sperm competition risk. We compared male courtship, mate guarding, copulation rates, and aggression between the treatment groups. To identify hormonal correlates of male behavioral adjustment, we measured plasma testosterone and corticosterone levels before and after the social treatment started. Contrary to our pre-registered predictions, males from the Double-pair treatment group decreased courtship rates compared to those from the Single-pair group, and Double-pair males responded less aggressively towards intruders than Single-pair males. Testosterone levels decreased over the breeding cycle, but social treatment had no effect on either testosterone or corticosterone levels. Our results indicate that male zebra finches do not intensify courtship or competitive reproductive behaviors, or upregulate key hormones when another breeding pair is present. Although we found no evidence for the predicted adaptive behavioral responses to sperm competition risk, we show that male zebra finches plastically adjust their behavior to their social environment.
Elsevier
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29652801
https://pub.uni-bielefeld.de/record/2965280
https://pub.uni-bielefeld.de/download/2965280/2965281
eng
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.yhbeh.2022.105243
info:eu-repo/semantics/altIdentifier/issn/0018-506X
info:eu-repo/semantics/altIdentifier/wos/000848468600001
info:eu-repo/semantics/altIdentifier/pmid/35998552
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2964213
2022-07-13T11:57:37Z
journal_article
doc-type:article
ddc:570
ddc:590
journal_articleFtxt
open_access
Inter- and Intraspecific Trait Compensation of Behavioural and Morphological Defences in a Damselfly Genus
Mühlenhaupt, Max ; https://orcid.org/0000-0003-0234-2533
Jiang, Bin
Brauner, Oliver
Mikolajewski, Dirk J.
Coenagrion
defensive traits
phenotypic plasticity
predation
trait correlations
ddc:570
ddc:590
Mühlenhaupt M, Jiang B, Brauner O, Mikolajewski DJ. Inter- and Intraspecific Trait Compensation of Behavioural and Morphological Defences in a Damselfly Genus. <em>Frontiers in Ecology and Evolution</em>. 2022;10: 874276.
Predation is a key driver of phenotypic diversification with prey having evolved sets of correlated anti-predator traits. Changes in anti-predator traits can be studied on an evolutionary as well as on a developmental timescale. Using a common garden setup, we studied inter- and intraspecific correlations of behavioural and morphological defences in four damselfly species that either occur in habitats dominated by predatory fish (fish habitats) or fishless habitats by raising larvae either with predatory fish or in a control treatment. We found inter- as well as intraspecific trait compensation (negative correlations) between behavioural and morphological defences. Compared to fishless habitat species, fish habitat species invested more in behavioural defences and less in morphological defences. This was mirrored by fish habitat species investing more in behavioural defences and less in morphological defences when reared with predatory fish whereas fishless habitat species invested less in morphological defences only. Our results emphasise the role of context-specific combinations of defensive traits to avoid predation. We suggest, considering changes in multiple correlated traits on different timescales when studying the evolution of anti-predator traits.
Frontiers Media SA
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29642132
https://pub.uni-bielefeld.de/record/2964213
https://pub.uni-bielefeld.de/download/2964213/2964253
eng
info:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2022.874276
info:eu-repo/semantics/altIdentifier/issn/2296-701X
info:eu-repo/semantics/altIdentifier/wos/000805952300001
https://creativecommons.org/licenses/by-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2964424
2022-07-13T12:24:25Z
journal_article
doc-type:article
ddc:370
ddc:590
journal_articleFtxt
open_access
Biodiversität in Gefahr - Die Nutzung von Muscheln und Schnecken durch den Menschen
Nolding, Jana ; https://orcid.org/0000-0002-5498-1794
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
ddc:370
ddc:590
Nolding J, Grotjohann N. Biodiversität in Gefahr - Die Nutzung von Muscheln und Schnecken durch den Menschen . <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2022;5(2): 2.
Dieser Beitrag befasst sich mit der wirtschaftlichen Nutzung von Mollusken durch den Menschen. Die Materialen sind für differenzierte Arbeiten im Bereich Ökologie/Biodiversität der Unter- und Mittelstufe von Sekundarschulen konzipiert.
Univ. Bielefeld
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29644248
https://pub.uni-bielefeld.de/record/2964424
https://pub.uni-bielefeld.de/download/2964424/2964433
https://pub.uni-bielefeld.de/download/2964424/2964434
deu
info:eu-repo/semantics/altIdentifier/doi/10.11576/BUPRAKTISCH-5246
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2964425
2022-07-13T12:36:09Z
journal_article
doc-type:article
ddc:370
ddc:590
journal_articleFtxt
open_access
Die „Fliegende Zooschule“ - Beflügelnder Unterricht auf der Adlerwarte Berlebeck
Nolding, Jana ; https://orcid.org/0000-0002-5498-1794
Ahrenholz, Lara
Grotjohann, Norbert ; https://orcid.org/0000-0003-3618-2988
ddc:370
ddc:590
Nolding J, Ahrenholz L, Grotjohann N. Die „Fliegende Zooschule“ - Beflügelnder Unterricht auf der Adlerwarte Berlebeck . <em>BU praktisch - Das Online-Journal für den Biologieunterricht</em>. 2022;5(2): 5.
Seit 2019 ist die “Fliegende Zooschule” der Adlerwarte Berlebeck fester Bestandteil der Adlerwarte Berlebeck. Dort können Lehrkräfte ihren Biologieunterricht durch zahlreiche Workshops rund um das Thema Vögel, Greifvögel und Vogelflug ergänzen. Auch für den Grundschulbereich stehen Sachunterrichtseinheiten zur Verfügung. Das Mystery aus diesem Artikel ergänzt einen Ausflug zur Adlerwarte Berlebeck und stellt die Geier und ihre Funktionen im Ökosystem in den Fokus.
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29644251
https://pub.uni-bielefeld.de/record/2964425
https://pub.uni-bielefeld.de/download/2964425/2964436
https://pub.uni-bielefeld.de/download/2964425/2964437
deu
info:eu-repo/semantics/altIdentifier/doi/10.11576/BUPRAKTISCH-5401
info:eu-repo/semantics/altIdentifier/issn/2627-4469
https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2984752
2023-12-19T12:00:53Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Analyzing Sex-Specific Dimorphism in Human Skeletal Stem Cells
Niemann, Tarek
Joneleit, Jonas
Storm, Jonathan
Nacke, Tom
Wähnert, Dirk
Kaltschmidt, Christian
Vordemvenne, Thomas
Kaltschmidt, Barbara
skeletal stem cells
sex dimorphism
osteogenic differentiation
inflammation
proliferation
NF-κB
ddc:590
Niemann T, Joneleit J, Storm J, et al. Analyzing Sex-Specific Dimorphism in Human Skeletal Stem Cells. <em>Cells</em>. 2023;12(23): 2683.
Sex-related differences are a current topic in contemporary science. In addition to hormonal regulation, cell-autonomous mechanisms are important in bone homeostasis and regeneration. In this study, human skeletal stem cells (SSCs) from female and male adults were cultured and analyzed with immunological assays and osteogenic differentiation assessments. Female SSCs exhibited a mean doubling time of 100.6 h, whereas male SSCs displayed a mean doubling time of 168.0 h. Immunophenotyping revealed the expression of the stem cell markers Nestin, CD133, and CD164, accompanied by the neural-crest marker SOX9. Furthermore, multiparameter flow cytometric analyses revealed a substantial population of multipotent SSCs, comprising up to 80% in both sexes. An analysis of the osteogenic differentiation potential demonstrated a strong mineralization in both male and female SSCs under physiological conditions. Recognizing the prevailing association of bone diseases with inflammatory processes, we also analyzed the osteogenic potential of SSCs from both sexes under pro-inflammatory conditions. Upon TNF-α and IL-1β treatment, we observed no sexual dimorphism on osteogenesis. In summary, we demonstrated the successful isolation and characterization of SSCs capable of rapid osteogenic differentiation. Taken together, in vitro cultured SSCs might be a suitable model to study sexual dimorphisms and develop drugs for degenerative bone diseases.
MDPI AG
2023
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29847529
https://pub.uni-bielefeld.de/record/2984752
https://pub.uni-bielefeld.de/download/2984752/2984753
eng
info:eu-repo/semantics/altIdentifier/doi/10.3390/cells12232683
info:eu-repo/semantics/altIdentifier/issn/2073-4409
info:eu-repo/semantics/altIdentifier/wos/001117495900001
info:eu-repo/semantics/altIdentifier/pmid/38067111
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
oai:pub.uni-bielefeld.de:2961334
2024-02-09T08:17:11Z
journal_article
doc-type:article
ddc:590
journal_articleFtxt
open_access
Students’ motivation in biology lessons — can student autonomy reduce the gender gap?
Großmann, Nadine ; https://orcid.org/0000-0003-0997-5624
Hofferber, Natalia
Wilde, Matthias ; https://orcid.org/0000-0002-1630-3263
Basten, Melanie ; https://orcid.org/0000-0001-8983-6549
ddc:590
Großmann N, Hofferber N, Wilde M, Basten M. Students’ motivation in biology lessons — can student autonomy reduce the gender gap? <em>European Journal of Psychology of Education</em>. 2022;38.
When it comes to biology lessons in Germany, girls generally exhibit higher levels of self-determined motivation than boys. Previous research suggests that fostering student autonomy could be a way to effectively address this gender gap. To investigate gender-related effects in biology education, a sample of 303 sixth-grade students (Mage = 11.31 years, SDage = 0.58 years) participated in a 3-h teaching unit on harvest mice that was taught in either an autonomy-supportive or controlling manner. The results revealed a significant effect of the treatment on self-determined motivation, with the effect being stronger for the boys. In the treatment with controlling teaching behavior, gender-related differences in self-determined motivation became apparent. In contrast, the gender gap was mainly smaller in the treatment with autonomy-supportive teaching behavior. Thus, the results suggest that satisfying the need for autonomy appears to be an effective means to help bridge the gender gap in biology lessons.
Springer
2022
http://purl.org/coar/resource_type/c_6501
info:eu-repo/semantics/article
doc-type:article
text
https://nbn-resolving.org/urn:nbn:de:0070-pub-29613344
https://pub.uni-bielefeld.de/record/2961334
https://pub.uni-bielefeld.de/download/2961334/2986915
eng
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10212-022-00604-1
info:eu-repo/semantics/altIdentifier/issn/0256-2928
info:eu-repo/semantics/altIdentifier/issn/1878-5174
info:eu-repo/semantics/altIdentifier/wos/000764946700001
https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
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