Divorce in the barn owl: securing a compatible or better mate entails the cost of re-pairing with a less ornamented female mate.

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_2AB2093B903A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Divorce in the barn owl: securing a compatible or better mate entails the cost of re-pairing with a less ornamented female mate.
Périodique
Journal of Evolutionary Biology
Auteur(s)
Dreiss A.N., Roulin A.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
27
Numéro
6
Pages
1114-1124
Langue
anglais
Résumé
Two nonmutually exclusive hypotheses can explain why divorce is an adaptive strategy to improve reproductive success. Under the 'better option hypothesis', only one of the two partners initiates divorce to secure a higher-quality partner and increases reproductive success after divorce. Under the 'incompatibility hypothesis', partners are incompatible and hence they may both increase reproductive success after divorce. In a long-term study of the barn owl (Tyto alba), we address the question of whether one or the two partners derive fitness benefits by divorcing. Our results support the hypothesis that divorce is adaptive: after a poor reproductive season, at least one of the two divorcees increase breeding success up to the level of faithful pairs. By breeding more often together, faithful pairs improve coordination and thereby gain in their efficiency to produce successful fledglings. Males would divorce to obtain a compatible mate rather than a mate of higher quality: a heritable melanin-based signal of female quality did not predict divorce (indicating that female absolute quality may not be the cause of divorce), but the new mate of divorced males was less melanic than their previous mate. This suggests that, at least for males, a cost of divorce may be to secure a lower-quality but compatible mate. The better option hypothesis could not be formally rejected, as only one of the two divorcing partners commonly succeeded in obtaining a higher reproductive success after divorce. In conclusion, incompatible partners divorce to restore reproductive success, and by breeding more often together, faithful partners improve coordination.
Mots-clé
barn owl, breeding success, divorce, female ornament, incompatibility hypothesis, melanin
Pubmed
Web of science
Open Access
Oui
Création de la notice
29/04/2014 17:52
Dernière modification de la notice
20/08/2019 14:10
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