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001-es BibID:BIBFORM051129
Első szerző:Tökölyi Jácint (biológus)
Cím:Climate and mammalian life histories / Jácint Tökölyi, Júlia Schmidt, Zoltán Barta
Dátum:2014
ISSN:0024-4066
Megjegyzések:Mammals display considerable geographical variation in life history traits. To understand how climatic factors might influence this variation, we analysed the relationship between life history traits-adult body size, litter size, number of litters per year, gestation lengh, neonate body mass, weaning age and age at sexual maturity - and several environmental variables quantifying the seasonality and predictability of temperature and precipitation across the distribution range of five terretrial mammal groups. Environmental factors correlated strongly with each other; therefore, we used principal components analysis to obtain orthogonal climatic predictors that could be used in multivariate models. We found that in bats, primates and even-toed ungulates adult body size tends to be larger in species inhabiting cold, dry, seasonal environments, whereas in carnivores and rodents a smaller body size in characteristic of warm, dry environments, suggesting that low food availability might limit adult size. Species inhabiting cold, dry, seasonal habitats have fewer, larger litters and shorter gestation periods; however, annual fecundity in these species is not higher, implying that the large litter size of mammals living at high latitudes is probably a consequence of time constraints imposed by strong seasonality. On the other hand, the number of litters per year and annual fecundity were greater in species inhabiting environments with higher seasonality in precipitation. Lastly, we found little evidence for specific effects of environmental variability. Our results highlight the complex effects of environmental factors in the evolution of life history traits in mammals.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
body size
Comparative analysis
macroecology
predictability
reproductive traits
seasonality
Élettudományok - Biológiai tudományok
Megjelenés:Biological Journal of the Linnean Society. - 111 (2014), p. 719-736. -
További szerzők:Schmidt Júlia Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:MTA-DE Lendület
MTA
Viselkedésökológiai Kutatócsoport
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM004075
Első szerző:Tökölyi Jácint (biológus)
Cím:Seasonal colour change by moult or by the abrasion of feather tips: a comparative study / Tökölyi Jácint, Bókony Veronika, Barta Zoltán
Dátum:2008
Megjegyzések:Many birds undergo seasonal changes in plumage coloration by prebreeding moult, abrasion of cryptic feather tips, or both. Seasonal dichromatism is thought to result from optimizing coloration to the conflicting demands of different life-cycle periods, sexual selection for conspicuousness being substantial during the mating season, whereas selection for camouflage and for social signals may act in all seasons. Furthermore, energetic and time demands may constrain the extent of moult, thereby limiting colour change. We investigated the relative importance of several factors in shaping this variation in a songbird clade using phylogenetic comparative methods. We found that prebreeding moult relates most strongly to breeding onset and winter diet, demonstrating that both time and food availability constrain feather replacement. Feather abrasion was best predicted by winter flocking behaviour, and secondarily by open habitats, implying that exposure to predators and the simultaneous need for social signalling may favour the expression of partially obscured ornaments in the non-breeding season. The combined occurrence of prebreeding moult and feather abrasion was associated with the polygynous mating system, suggesting that species under strong sexual selection may employ both strategies of colour change to ensure the full expression of breeding coloration.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
moult constraints
plumage coloration
predation risk
sexual selection
social signalling
Megjelenés:Biological Journal of the Linnean Society. - 94 : 4 (2008), p. 711-721. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Barta Zoltán (1967-) (biológus, zoológus)
Internet cím:elektronikus változat
DOI
elektronikus változat
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