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001-es BibID:	BIBFORM084644
Első szerző:	Bókony Veronika (alkalmazott zoológus)
Cím:	Necessity or capacity? Physiological state predicts problem-solving performance in house sparrows / Bókony Veronika, Lendvai Ádám Zoltán, Vágási István Csongor, Laura Patras, Pap Péter László, Németh József, Vincze Ernő, Papp Sándor, Preiszner Bálint, Seress Gábor, Liker András
Dátum:	2014
ISSN:	1045-2249
Megjegyzések:	Innovative behaviors such as exploiting novel food sources can grant significant fitness benefits for animals, yet little is known about the mechanisms driving such phenomena, and the role of physiology is virtually unexplored in wild species. Two hypotheses predict opposing effects of physiological state on innovation success. On one hand, poor physiological condition may promote innovations by forcing individuals with poor competitive abilities to invent alternative solutions. On the other hand, superior physiological condition may ensure greater cognitive capacity and thereby better problem-solving and learning performance. To test these hypotheses, we studied the behavior of wild-caught house sparrows (Passer domesticus) in 4 novel tasks of food acquisition, one of which was presented to the birds in repeated trials, and we investigated the relationships of individual performance with relevant physiological traits. We found that problem-solving performance across the 4 tasks was moderately consistent within individuals. Birds with lower integrated levels of corticosterone, the main avian stress hormone, solved the most difficult task faster and were more efficient learners in the repeated task than birds with higher corticosterone levels. Birds with higher concentration of total glutathione, a key antioxidant, solved 2 relatively easy tasks faster, whereas birds with fewer coccidian parasites tended to solve the difficult task more quickly. Our results, thus, indicate that aspects of physiological state influence problem-solving performance in a context-dependent manner, and these effects on problem-solving capacity, probably including cognitive abilities, are more likely to drive individual innovation success than necessity due to poor condition.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk animal innovation coccidiosis learning oxidative status stress physiology
Megjelenés:	Behavioral Ecology. - 25 : 1 (2014), p. 124-135. -
További szerzők:	Lendvai Ádám Zoltán (1977-) (biológus) Vágási Csongor István Pătraş, Laura Pap Péter László (ökológus) Németh József (1954-) (vegyész, analitikus) Vincze Ernő Papp Sándor Preiszner Bálint Seress Gábor Liker András
Pályázati támogatás:	OTKA-K84132 OTKA OTKA-PD76862 OTKA OTKA-K75965 OTKA TÁMOP-4.2.2.A-11/1/KONV-2012-0064 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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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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001-es BibID:	BIBFORM072322
035-os BibID:	(cikkazonosító)e0192701 (WOS)000424814300039 (Scopus)85042120858
Első szerző:	Vágási Csongor István
Cím:	Experimental increase in baseline corticosterone level reduces oxidative damage and enhances innate immune response / Csongor I. Vágási, Laura Pătraș, Péter L. Pap, Orsolya Vincze, Cosmin Mureșan, József Németh, Ádám Z. Lendvai
Dátum:	2018
ISSN:	1932-6203
Megjegyzések:	Glucocorticoid (GC) hormones are significant regulators of homeostasis. The physiological effects of GCs critically depend on the time of exposure (short vs. long) as well as on their circulating levels (baseline vs. stress-induced). Previous experiments, in which chronic and high elevation of GC levels was induced, indicate that GCs impair both the activity of the immune system and the oxidative balance. Nonetheless, our knowledge on how mildly elevated GC levels, a situation much more common in nature, might influence homeostasis is limited. Therefore, we studied whether an increase in GC level within the baseline range suppresses or enhances condition (body mass, hematocrit and coccidian infestation) and physiological state (humoral innate immune system activity and oxidative balance). We implanted captive house sparrows Passer domesticus with either 60 days release corticosterone (CORT) or control pellets. CORT-treated birds had elevated baseline CORT levels one week after the implantation, but following this CORT returned to its pre-treatment level and the experimental groups had similar CORT levels one and two months following the implantation. The mass of tail feathers grown during the initial phase of treatment was smaller in treated than in control birds. CORT implantation had a transient negative effect on body mass and hematocrit, but both of these traits resumed the pre-treatment values by one month post-treatment. CORT treatment lowered oxidative damage to lipids (malondialdehyde) and enhanced constitutive innate immunity at one week and one month post-implantation. Our findings suggest that a relatively short-term (i.e. few days) elevation of baseline CORT might have a positive and stimulatory effect on animal physiology.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk antioxidant glucocorticoid stress condition innate immunity oxidative stress
Megjelenés:	Plos One. - 13 : 2 (2018), p. 1-17. -
További szerzők:	Pătraş, Laura Pap Péter László (ökológus) Vincze Orsolya (1988-) (biológus) Mureşan, Cosmin Németh József (1954-) (vegyész, analitikus) Lendvai Ádám Zoltán (1977-) (biológus)
Pályázati támogatás:	EFOP-3.6.2-16-2017-00009 EFOP OTKA K 113108 OTKA EFOP-3.6.1-16-2016-00022 EFOP PD-76862 OTKA
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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