Melanin-specific life-history strategies.

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Etat: Serval
Version: Final published version
ID Serval
serval:BIB_EBBF75A8B178
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Melanin-specific life-history strategies.
Périodique
American Naturalist
Auteur(s)
Emaresi G., Bize P., Altwegg R., Henry I., van den Brink V., Gasparini J., Roulin A.
ISSN
1537-5323 (Electronic)
ISSN-L
0003-0147
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
183
Numéro
2
Pages
269-280
Langue
anglais
Résumé
Abstract The maintenance of genetic variation is a long-standing issue because the adaptive value of life-history strategies associated with each genetic variant is usually unknown. However, evidence for the coexistence of alternative evolutionary fixed strategies at the population level remains scarce. Because in the tawny owl (Strix aluco) heritable melanin-based coloration shows different physiological and behavioral norms of reaction, we investigated whether coloration is associated with investment in maintenance and reproduction. Light melanic owls had lower adult survival compared to dark melanic conspecifics, and color variation was related to the trade-off between offspring number and quality. When we experimentally enlarged brood size, light melanic males produced more fledglings but in poorer condition, and they were less often recruited in the local breeding population than those of darker melanic conspecifics. Our results also suggest that dark melanic males allocate a constant effort to raise their brood independently of environmental conditions, whereas lighter melanic males finely adjust reproductive effort in relation to changes in environmental conditions. Color traits can therefore be associated with life-history strategies, and stochastic environmental perturbation can temporarily favor one phenotype over others. The existence of fixed strategies implies that some phenotypes can sometimes display a "maladapted" strategy. Long-term population monitoring is therefore vital for a full understanding of how different genotypes deal with trade-offs.
Mots-clé
life-history strategies, melanin, color polymorphism, genetic variation, melanin-based coloration
Pubmed
Web of science
Open Access
Oui
Création de la notice
28/08/2013 15:42
Dernière modification de la notice
09/05/2019 2:59
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