Dominant nestlings displaying female-like melanin coloration behave altruistically in the barn owl

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Ressource 1Télécharger: BIB_43B42992DB98.P001.pdf (453.31 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_43B42992DB98
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Dominant nestlings displaying female-like melanin coloration behave altruistically in the barn owl
Périodique
Animal Behaviour
Auteur(s)
Roulin A., Da Silva A., Ruppli C.A.
ISSN
0003-3472
Statut éditorial
Publié
Date de publication
2012
Peer-reviewed
Oui
Volume
84
Numéro
5
Pages
1229-1236
Langue
anglais
Résumé
When competing over parental resources, young animals may be typically selfish to the point of siblicide. This suggests that limited parental resources promote the evolution of sibling competition rather than altruistic or cooperative behaviours. In striking contrast, we show here that in 71% of experimental three-chick broods, nestling barn owls, Tyto alba, gave food to their siblings on average twice per night. This behaviour prevailed in the first-born dominant nestlings rather than the last-born subordinate nestlings. It was also more prevalent in individuals displaying a heritable dark phaeomelanin-based coloration, a typical female-specific plumage trait (owls vary from dark reddish to white, females being on average darker reddish than males). Stealing food items from siblings, which occurred in 81% of the nests, was more frequent in light than dark phaeomelanic dominant nestlings. We suggest that food sharing has evolved in the barn owl because parents store prey items in their nest that can be used by the offspring to feed their nestmates to derive indirect (kin selection) or direct benefits (pseudoreciprocity or by-product mutualism). The cost of feeding siblings may be relatively low for dominant individuals while the indirect genetic benefits could be high given that extrapair paternity is infrequent in this species. Thus, in situations in which young animals have access to more food resources than they currently need, they can altruistically share them with their siblings.
Mots-clé
altruism, barn owl, cooperation, egoism, food sharing, food stealing, melanin, selfish, sibling competition, Tyto alba
Web of science
Open Access
Oui
Création de la notice
14/08/2012 12:20
Dernière modification de la notice
20/08/2019 14:47
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