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001-es BibID:	bibEBI00026020
Első szerző:	Gyulavári Hajnalka Anna (biológus)
Cím:	Sexual selection on flight endurance, flight-related morphology and physiology in a scrambling damselfly / Hajnalka Anna Gyulavári, Lieven Therry, György Dévai, Robby Stoks
Dátum:	2014
ISSN:	0269-7653 1573-8477
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Evolutionary Ecology. - 28 : 4 (2014), p. 639-654. -
További szerzők:	Therry, Lieven Dévai György (1942-) (ökológus) Stoks, Robby
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM100878
035-os BibID:	(WoS)000768095500001 (Scopus)85126096587
Első szerző:	Hauber, Mark E.
Cím:	Clutch size and the rejection of parasitic eggs: a comparative test of the maternal investment hypothesis / Mark E. Hauber, Christina Riehl, Jenő Nagy
Dátum:	2022
ISSN:	0269-7653
Megjegyzések:	Obligate brood parasitic birds lay their eggs in the nests of other species, reducing the host's own reproductive output. To circumvent these fitness costs, many-but not all-host species have evolved the ability to recognize and reject brood parasitic eggs. What factors constrain egg rejection, and why do host species vary in their likelihood of rejection? Previous comparative studies have found that egg rejection rates covary with several biotic factors (including larger body size, smaller relative brain size, and more northerly breeding latitudes), but much behavioral variation in the occurrence of egg rejection remains unexplained. In this study, we test a corollary of the maternal investment hypothesis, by assessing whether species with higher clutch sizes are more likely to eliminate parasitic eggs. We examined two published data sets comprising over 200 unique bird species, controlling for phylogeny and other known interspecific correlates of egg rejection rates. Contrary to the prediction, we found no evidence for a positive relationship between clutch size and egg rejection rate. Rather, our analyses suggest a weak but consistent negative relationship between absolute and relative metrics of clutch size versus egg rejection rate across species. These results are instead consistent with two previously proposed alternative hypotheses: that egg rejection is constrained by a trade-off between maternal investment and anti-parasitic defenses, possibly mediated by endocrine mechanisms linked to parental care, and/or that cognitive decision rules facilitate the detection of dissimilar eggs in smaller clutches.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk endocrine trade-off egg rejection host-parasite coevolution relative clutch size
Megjelenés:	Evolutionary Ecology. - 36 : 2 (2022), p. 263-272. -
További szerzők:	Riehl, Christina Nagy Jenő (1989-) (biológus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM030378
Első szerző:	Tökölyi Jácint (biológus)
Cím:	Timing of avian reproduction in unpredictable environments / Jácint Tökölyi, John M. McNamara, Alasdair I. Houston, Zoltán Barta
Dátum:	2011
ISSN:	0269-7653
Megjegyzések:	Organisms living in periodically varying environments adjust their life history events to the changes in food availability. When these changes are not entirely predictable animals face a trade-off between maintaining physiological preparedness (which can be costly) and being unprepared (which decreases the chances of successful reproduction). To investigate this problem, we developed an optimal annual routine model of gonad regulation in birds. Most birds regress their reproductive organs during non-breeding periods, but to start breeding again they need to have functional gonads. Maintaining the gonads in this state is costly, but because it takes time to achieve this state, if gonads are not functional the bird may miss a possible breeding opportunity. We explore the resolution of this trade-off in environments where favorable periods can occur at any time of the year and variability in the length of good and bad periods can be altered. Consistent with empirical studies of reproductive behavior in unpredictable environments, we find that birds maintain the gonads partially activated during unfavorable conditions in many cases. However, gonad regulation may differ strikingly depending on the consistency of the good and bad periods. Furthermore, seasonal changes in food availability lead to the entrainment of reproduction and the segregation of the breeding and non-breeding season, even if the magnitude of seasonality is small compared to the degree of environmental fluctuations. These results indicate that several aspects of the environment need to be taken into account to understand reproductive behavior in unpredictable environments. Given that the tradeoff between the costs and benefits of maintaining physiological preparedness is not limited
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Phenotypic flexibility Annual routine Gonadal cycle Breeding season Opportunism Egészség- és Környezettudomány
Megjelenés:	Evolutionary Ecology. - 26 : 1 (2011), p. 25-42. -
További szerzők:	McNamara, John M. Houston, Alasdair I. Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:	TÁMOP-4.2.1/B-09/1-KONV-2010-0007 TÁMOP Viselkedésökológiai Kutatócsoport
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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