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001-es BibID:	BIBFORM107991
035-os BibID:	(cikkazonosító)20190733 (WOS)000507289800002 (Scopus)85077885225
Első szerző:	Angelier, Frédéric
Cím:	When do older birds better resist stress? A study of the corticosterone stress response in snow petrels / Frédéric Angelier, Olivier Chastel, Adam Z. Lendvai, Charline Parenteau, Henri Weimerskirch, John C. Wingfield
Dátum:	2020
ISSN:	1744-9561
Megjegyzések:	Life-history theory predicts that, to optimize their fitness, individuals should increase their reproductive effort as their residual reproductive value decreases. Accordingly, several studies have shown that individuals downregulate their glucocorticoid stress response (a proxy of reproductive investment in vertebrates) as they age, and as the subsequent reproductive value decreases. However, and surprisingly, results appear inconsistent, suggesting that the environmental context or the individual state may affect the relationship between age and reproductive effort. Here, we tested for the first time this hypothesis, and more specifically, whether this attenuation of the corticosterone stress response with advancing age depends on the energetic status of individuals. We compared the influence of age on the corticosterone stress response between fasting and non-fasting breeding snow petrels (Pagodroma nivea), an extremely long-lived bird. As expected, we found that the corticosterone stress response was attenuated in old petrels, but only when they were not fasting. Interestingly, this pattern was not apparent in fasting petrels, suggesting that old birds downregulate their corticosterone stress response and increase their parental investment only when they are in good body condition. At the ultimate level, old individuals may maintain a strong corticosterone stress response when fasting because the survival costs of increased stress resistance and parental effort might then outweigh their reproductive benefits.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Biology Letters. - 16 : 1 (2020), p. 1-4. -
További szerzők:	Chastel, Olivier Lendvai Ádám Zoltán (1977-) (biológus) Parenteau, Charline Weimerskirch, Henri Wingfield, John C.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM081449
035-os BibID:	(cikkazonosító)20150272 (PMID)26179799
Első szerző:	Lendvai Ádám Zoltán (biológus)
Cím:	Within-individual plasticity explains age-related decrease in stress response in a short-lived bird / Ádám Z. Lendvai, Mathieu Giraudeau, Veronika Bókony, Frédéric Angelier, Olivier Chastel
Dátum:	2015
ISSN:	1744-9561
Megjegyzések:	A crucial problem for every organism is how to allocate energy between competing life-history components. The optimal allocation decision is often state-dependent and mediated by hormones. Here, we investigated how age, a major state variable affects individuals' hormonal response to a standardized stressor: a trait that may reflect allocation between self-maintenance and reproduction. We caught free-living house sparrows and measured their hormonal (corticosterone) response to capture stress in consecutive years. Using a long-term ringing dataset, we determined the age of the birds, and we partitioned the variation into within- and among-individual age components to investigate the effects of plasticity versus selection or gene flow, respectively, on the stress response. We found large among-individual variation in the birds' hormone profiles, but overall, birds responded less strongly to capture stress as they grew older. These results suggest that stress responsiveness is a plastic trait that may vary within individuals in an adaptive manner, and natural selection may act on the reaction norms producing optimal phenotypic response in the actual environment and life-history stage.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk corticosterone stress response plasticity
Megjelenés:	Biology Letters. - 11 : 7 (2015), p. 1-4. -
További szerzők:	Giraudeau, Mathieu Bókony Veronika (alkalmazott zoológus) Angelier, Frédéric Chastel, Olivier
Pályázati támogatás:	OTKA PD76862 OTKA OTKA K113108 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: