Experimental support for the make-up hypothesis in nestling tawny owls (Strix aluco)

Détails

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_7AEB7D62BA4C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Experimental support for the make-up hypothesis in nestling tawny owls (Strix aluco)
Périodique
Behavioral Ecology
Auteur(s)
Piault R., Gasparini J., Bize P., Paulet M., McGraw K., Roulin A.
ISSN
1045-2249
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
19
Numéro
4
Pages
703-709
Langue
anglais
Résumé
Body condition can affect coloration of traits used in sexual selection and parent-offspring communication by inducing rapid internal changes in pigment concentration or aggregation, thickness of collagen arrays, or blood flux. The recent "makeup hypothesis" proposes an alternative honesty-reinforcing mechanism, with behaviorally mediated deposition of substances on body surfaces ("cosmetics") generating covariation between body condition and coloration. In birds, the uropygial gland wax is actively spread on feathers using the bill and changes in its deposition rate may cause rapid changes in bill and plumage coloration. Using tawny owl nestlings, we tested 3 predictions of the makeup hypothesis, namely that 1) quantity of preen wax deposited accounts for variation in bill coloration, 2) an immune stimulation (induced by injection of a lipopolysaccharide [LPS]) impairs uropygial gland wax production, and 3) different intensities of immune stimulations (strong vs. weak stimulations induced by injections of either LPS or phytohemagglutinin [PHA], respectively) and high versus low food availabilities result in different bill colorations. We found that 1) preen wax reduced bill brightness, 2) a challenge with LPS impaired uropygial gland development, and 3) nestlings challenged with LPS had a brighter bill than PHA-injected nestlings, whereas diet manipulation had no significant effect. Altogether, these results suggest that a strong immune challenge may decrease preen wax deposition rate on the bill of nestling birds, at least by impairing gland wax production, which causes a change in bill coloration. Our study therefore highlights that cosmetic colors might signal short-term variation in immunological status.
Mots-clé
bill coloration, immune status, makeup hypothesis, preening behavior, preen wax, uropygial gland
Web of science
Open Access
Oui
Création de la notice
24/01/2008 17:43
Dernière modification de la notice
20/08/2019 14:36
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