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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Delayed plumage signals social status in a mutually ornamented bird (2023)
Auteurs :	Bruna Araújo-Silva, Auteur ; Marcello Barcellos, Auteur ; Charles Duca, Auteur ; Pedro Diniz, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (164(2) April, 2023)
Article en page(s) :	417-431
Langues:	Anglais
Mots-clés:	Delayed plumage maturation ; Honest signal ; Saffron Finch ; Sicalis flaveola ; Social cost ; Status signaling
Résumé :	The status signaling hypothesis suggests that inconspicuous plumages are an honest signal of subordination in social animals, including those exhibiting delayed plumage maturation. In addition, body size may also determine the outcome of aggressive interactions and shape dominance relationships. We observed flocks of Saffron Finches (Sicalis flaveola brasiliensis) during the non-breeding season to investigate whether the probability of winning an aggressive interaction varies according to the plumage color class (yellow female, yellow male, and dull bird of both sexes), morphology (body mass, wing length, and tail length), and plumage color variation (reflectance of yellow breast feathers). In this subspecies, younger individuals of both sexes breed with duller plumage and present late maturation to yellow, definitive plumage. We found that, in general, yellow females were more likely to win aggressive interactions against conspecifics (of any plumage color class) than yellow males and dull birds, irrespective of plumage color variation or morphology. In contrast, yellow males were not more likely to win aggressive interactions against conspecifics than dull birds. When comparing yellow females to each other and yellow males to each other, in general, larger birds and birds with brighter plumages were more likely to win the aggressive interactions. Our results partially support the status signaling hypothesis, suggesting that plumage color class has a major influence on social dominance status, whereas gradual variation in morphology and plumage coloration signals fighting ability within plumage color classes.
En ligne :	https://doi.org/10.1007/s10336-022-02035-7

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