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1.
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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Saját polcon:
2.
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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