Darker eumelanic barn owls better withstand food depletion through resistance to food deprivation and lower appetite.

Détails

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_B808E2941F67
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Darker eumelanic barn owls better withstand food depletion through resistance to food deprivation and lower appetite.
Périodique
Oecologia
Auteur(s)
Dreiss A., Henry I., Ruppli C., Almasi B., Roulin A.
ISSN
1432-1939[electronic], 0029-8549[linking]
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
164
Numéro
1
Pages
65-71
Langue
anglais
Résumé
The intensity of selection exerted on ornaments typically varies between environments. Reaction norms may help to identify the conditions under which ornamented individuals have a selective advantage over drab conspecifics. It has been recently hypothesized that in vertebrates eumelanin-based coloration reflects the ability to regulate the balance between energy intake and expenditure. We tested two predictions of this hypothesis in barn owl nestlings, namely that darker eumelanic individuals have a lower appetite and lose less weight when food-deprived. We found that individuals fed ad libitum during 24 h consumed less food when their plumage was marked with larger black spots. When food-deprived for 24 h nestlings displaying larger black spots lost less weight. Thus, in the barn owl the degree of eumelanin-based coloration reflects the ability to withstand periods of food depletion through lower appetite and resistance to food restriction. Eumelanic coloration may therefore be associated with adaptations to environments where the risk of food depletion is high.
Mots-clé
Animals, Animals, Newborn, Appetite, Energy Metabolism, Female, Food Deprivation/physiology, Male, Melanins/metabolism, Melanocortins/metabolism, Mice, Pigmentation, Strigiformes/physiology, Weight Loss
Pubmed
Web of science
Création de la notice
10/08/2010 10:13
Dernière modification de la notice
20/08/2019 16:26
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