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001-es BibID:	BIBFORM049722
Első szerző:	Lendvai Ádám Zoltán (biológus)
Cím:	Carotenoid-based plumage coloration reflects feather corticosterone levels in male house finches (Haemorhous mexicanus) / Á. Z. Lendvai, M. Giraudeau, J. Németh, V. Bakó, K. J. McGraw
Dátum:	2013
Megjegyzések:	Indicator models of sexual selection predict thatexaggerated traits communicate information about sender conditionor quality to conspecific receivers. Environmental challengeshave often been considered as one such condition thatcould be encoded in an ornamental trait, and there is nowextensive evidence showing how different stressors (e.g., nutritional,parasitological, and environmental) impact sexual signalelaboration. One of the primary means of assessing stress is byquantifying glucocorticoid (corticosterone or cortisol (CORT))levels. For many ornaments, CORT impairs trait expression;however, the evidence is limited and mixed for one of theclassic honest signals in animals, ornamental carotenoid coloration.In a model species for studies of carotenoid ornamentation(the house finch, Haemorhous mexicanus), we examinedthe relationship between male plumage redness and featherCORT levels, which serve as an integratedmeasure of hormoneconcentration during feather growth. We measured CORT inboth tail (melanin-containing) and breast (carotenoid-containing)feathers and found that CORT levels were not differentbetween body regions, but they were negatively correlated withplumage hue, with redder birds having more CORT in feathers.Despite opposing traditional views on stress and ornamentation,our results actually corroborate three other studies showingpositive relationships between carotenoid coloration andCORT levels. Though the molecular mechanisms underlyingsuch a relationship are still unclear, our results suggest thatCORT should not be considered as a simple indicator of individualquality but rather as a mediator of complex allocationdecisions or signals of metabolic activity that could link up withmore elaborate expression of ornamental traits.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Honest signaling Plumage ornamentation Sexual selection Stress hormones Stress response
Megjelenés:	Behavioral Ecology and Sociobiology. - 67 (2013), p. 1817-1824. -
További szerzők:	Giraudeau, Mathieu Németh József (1954-) (vegyész, analitikus) Bakó V. McGraw, Kevin J.
Pályázati támogatás:	75965 OTKA PD76862 OTKA
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM078526
Első szerző:	Sepp, Tuul
Cím:	Feather corticosterone levels are not correlated with health or plumage coloration in juvenile house finches / Tuul Sepp, Steve Desaivre, Adam Z. Lendvai, József Németh, Kevin J. McGraw, Mathieu Giraudeau
Dátum:	2018
ISSN:	0024-4066
Megjegyzések:	Stressful developmental conditions can have both short- and long-term effects on animal physiology and behaviour, but studies on this topic are rarely conducted in the wild and, if so, largely focus on only the first few weeks of life. To fill this gap, we tested developmental links between early-life stress and the physiology of wild-caught juveniles later during development. Specifically, we examined potential associations between feather corticosterone levels of hatchling house finches (Haemorhous mexicanus) and several phenotypic and physiological traits measured several months later in juveniles. We assessed four indices of health (oxidative damage to lipids, innate immunity, intestinal parasite infection intensity and plumage colour) and two morphological traits (body mass and tarsus length) in juveniles. Feather corticosterone content was not related to any of the juvenile traits later in development. Our results suggest that physiological variables can change rapidly during ontogeny, such that stress hormone levels in juvenile feathers could be uncoupled from the real stress levels experienced by nestlings. Instead, juvenile physiology might be more dependent on current environmental conditions than on early-life conditions (i.e. environmental matching), and this may limit the effects on fitness of poor early-developmental conditions.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban body size carotenoid pigmentation Haemorhous mexicanus immunity oxidative stress parasitism steroids
Megjelenés:	Biological Journal of the Linnean Society. - 124 : 2 (2018), p. 157-164. -
További szerzők:	Desaivre, Steve Lendvai Ádám Zoltán (1977-) (biológus) Németh József (1954-) (vegyész, analitikus) McGraw, Kevin J. Giraudeau, Mathieu
Pályázati támogatás:	EFOP-3.6.2-16-2017-00009 EFOP OTKA K113108 OTKA EFOP-3.6.1-16-2016-00022 EFOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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