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001-es BibID:BIBFORM103319
035-os BibID:(cikkazonosító)89 (Wos)000467428400001 (Scopus)85065121256
Első szerző:Bókony Veronika (alkalmazott zoológus)
Cím:Changing Migratory Behaviors and Climatic Responsiveness in Birds / Bókony Veronika, Barta Zoltán, Végvári Zsolt
Dátum:2019
ISSN:2296-701X
Megjegyzések:Change of avian migratory behavior is one of the best-studied phenomena presumably associated with contemporary climate change, yet to what degree these behavioral changes represent responses to climate warming is still controversial. We investigated interspecific variation in migratory behavior over three decades at a Central-European site, testing whether the type and extent of behavioral change are predicted by species' responsiveness to short-term variation in large-scale climatic indices. We found that species with earlier arrivals at the breeding grounds after winters with higher North-Atlantic Oscillation indices were more likely to overwinter at the study site. This behavior was more frequent in the second half than in the first half of the study, although the extent of this change was not predicted quantitatively by short-term climatic responsiveness. Overwintering was more prevalent in short-distance migrants with more complex diets and larger population sizes. Furthermore, species arriving earlier after summers with higher Sahel rainfall indices increasingly advanced their first arrival date, whereas species that do not molt in the pre-breeding season increased their frequency of overwintering in more recent years. Our results demonstrate that interspecific variation in short-term climatic responsiveness predicts long-term changes in migratory behaviors, supporting that the latter are responses to climate change. Furthermore, the type of response (advancing arrivals or overwintering near the breeding grounds) depends on life history. Finally, we found that overwintering behavior during the study period predicted subsequent trends in population size, suggesting that information on temporal changes in migratory strategy may help conservation planning and risk assessment.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Frontiers in Ecology and Evolution. - 7(2019), p. 1-12. -
További szerzők:Végvári Zsolt (1969-) (biológus) Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:NKFIH-K-112527
Egyéb
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DOI
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2.

001-es BibID:BIBFORM022848
Első szerző:Lendvai Ádám Zoltán (biológus)
Cím:The effect of energy reserves on social foraging: hungry sparrows scrounge more / Ádám Z. Lendvai, Zoltán Barta, András Liker, Veronika Bókony
Dátum:2004
ISSN:0962-8452
Megjegyzések:Animals often use alternative strategies when they compete for resources, but it is unclear in most cases what factors determine the actual tactic followed by individuals. Although recent models suggest that the internal state of animals may be particularly important in tactic choice, the effects of state variables on the use of alternative behavioural forms have rarely been demonstrated. In this study, using experimental wind exposure to increase overnight energy expenditure, we show that flock-feeding house sparrows (Passer domesticus) with lowered energy reserves increase their use of scrounging (exploiting others' food findings) during their first feed of the day. This result is in accordance with the prediction of a state-dependent model of use of social foraging tactics. We also show that scrounging provides less variable feeding rates and patch finding times than the alternative tactic. These latter results support the theoretical assumption that scrounging is a risk-averse tactic, i.e. it reduces the risk of immediate starvation. As the level of energy reserves predicts the use of social foraging tactics, we propose that selection should favour individuals that monitor the internal state of flock mates and use this information to adjust their own tactic choice.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
producer-scrounger game
state-variables
starvation risk
foraging strategies
house sparrow
Passer domesticus
Megjelenés:Proceedings of the Royal Society. Series B. Biological sciences. - 271 : 1556 (2004), p. 2467-2472. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus) Liker András Bókony Veronika (alkalmazott zoológus)
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DOI
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3.

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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4.

001-es BibID:BIBFORM013496
Első szerző:Végvári Zsolt (biológus)
Cím:Life history predicts advancement of avian spring migration in response to climate change / Zsolt Végvári, Veronika Bókony, Zoltán Barta, Gábor Kovács
Dátum:2010
ISSN:1354-1013
Megjegyzések:An increasing number of studies demonstrate that plant and animal phenologies such as the timing of bird migration have been advancing over the globe, likely as a result of climate change. Even closely related species differ in their phenological responses, and the sources of this variation are poorly established.We used a large, standardized dataset of first arrival dates (FAD) of migratory birds to test the effects of phylogenetic relationships and various life-history and ecological traits on the degree to which different species adapt to climate change by earlier migration in spring. Using the phylogenetic comparative method, we found that the advancement of FAD was greater in species with more generalized diet, shorter migration distance, more broods per year, and less extensive prebreeding molt. In turn, we found little evidence that FAD trends were influenced by competition for mating (polygamy or extra-pair paternity) and breeding opportunities (cavity nests). Our findings were robust to several potentially confounding effects. These evolutionary correlations, coupled with the low levels of phylogenetic dependence we found, indicate that avian migration phenology adapts to climate change as a species-specific response. Our results suggest that the degree of this response is fundamentally shaped by constraints and selection pressures of the species' life history, and less so by the intensity of sexual selection.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
bird migration
climatic change
Hortobágy
phylogenetic comparative method
Megjelenés:Global Change Biology. - 16 : 1 (2010), p. 1-11. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Barta Zoltán (1967-) (biológus, zoológus) Kovács Gábor
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
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