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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:	BIBFORM119775
035-os BibID:	(WoS)000835686400001 (Scopus)85135539100
Első szerző:	Tóth Zoltán (ökológus)
Cím:	Social information-mediated population dynamics in non-grouping prey / Zoltán Tóth, Gabriella Kőmüves
Dátum:	2022
ISSN:	0340-5443
Megjegyzések:	Inadvertent social information (ISI) use, i.e., the exploitation of social cues including the presence and behaviour of others, has been predicted to mediate population-level processes even in the absence of cohesive grouping. However, we know little about how such effects may arise when the prey population lacks social structure beyond the spatiotemporal autocorrelation originating from the random movement of individuals. In this study, we built an individual-based model where predator avoidance behaviour could spread among randomly moving prey through the network of nearby observers. We qualitatively assessed how ISI use may affect prey population size when cue detection was associated with different probabilities and fitness costs, and characterised the structural properties of the emerging detection networks that would provide pathways for information spread in prey. We found that ISI use was among the most influential model parameters affecting prey abundance and increased equilibrium population sizes in most examined scenarios. Moreover, it could substantially contribute to population survival under high predation pressure, but this effect strongly depended on the level of predator detection ability. When prey exploited social cues in the presence of high predation risk, the observed detection networks consisted of a large number of connected components with small sizes and small ego networks; this resulted in efficient information spread among connected individuals in the detection networks. Our study provides hypothetical mechanisms about how temporary local densities may allow information diffusion about predation threats among conspecifics and facilitate population stability and persistence in non-grouping animals. Significance statement The exploitation of inadvertently produced social cues may not only modify individual behaviour but also fundamentally influence population dynamics and species interactions. Using an individual-based model, we investigated how the detection and spread of adaptive antipredator behaviour may cascade to changes in the demographic performance of randomly moving (i.e., non-grouping) prey. We found that social information use contributed to population stability and persistence by reducing predation-related per capita mortality and raising equilibrium population sizes when predator detection ability reached a sufficient level. We also showed that temporary detection networks had structural properties that allowed efficient information spread among prey under high predation pressure. Our work represents a general modelling approach that could be adapted to specific predator-prey systems and scrutinise how temporary local densities allow dynamic information diffusion about predation threats and facilitate population stability in non-grouping animals.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Detection networks Equilibrium population size Individual-based model Non-grouping animals Predator-prey relationship Social information use
Megjelenés:	Behavioral Ecology And Sociobiology. - 76 : 8 (2022), p. 1-8 (cikkazonosító)110. -
További szerzők:	Kőmüves Gabriella
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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