Female- and male-specific signals of quality in the barn owl

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Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_1D2A5247A7EF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Female- and male-specific signals of quality in the barn owl
Périodique
Journal of Evolutionary Biology
Auteur(s)
Roulin A., Riols C., Dijkstra C., Ducrest A. L.
ISSN
1010-061X
Statut éditorial
Publié
Date de publication
2001
Peer-reviewed
Oui
Volume
14
Numéro
2
Pages
255-267
Langue
anglais
Résumé
Most bird studies of female signalling have been confined to species in which females display a male-ornament in a vestigial form. However, a great deal of benefit may be gained from considering phenotypic traits that are specific to females. This is because (1) sex-specific traits may signal sex-specific qualities and (2) females may develop a male-ornament not because they are selected to do so, but because fathers transmit to daughters the underlying genes for its expression (genetic correlation between the sexes). We investigated these two propositions in the barn owl Tyto alba, a species in which male plumage is lighter in colour and less marked with black spots than that of females. Firstly, we present published evidence that female plumage spottiness reflects parasite resistance ability. We also show that male plumage coloration is correlated with reproductive success, male feeding rate and heart mass. Secondly, cross-fostering experiments demonstrate that plumage coloration and spottiness are genetically correlated between the sexes. This implies that if a given trait value is selected in one sex, the other sex will indirectly evolve towards a similar value. This prediction is supported by the observation that female plumage coloration and spottiness resembled that of males, in comparisons at the level of Tyto alba alba populations, Tyto alba subspecies and Tyto species. Our results therefore support the hypothesis that sex-specific traits signal sex-specific qualities and that a gene for a sex-specific trait can be expressed in the other sex as the consequence of a genetic correlation between the sexes.
Mots-clé
barn owl, female ornamentation, genetic correlation, good genes, sexual selection
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Création de la notice
24/01/2008 18:42
Dernière modification de la notice
03/03/2018 14:33
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