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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Extra-pair mating system of a synchronously breeding tropical songbird
Auteurs :	B. J. M. Stutchbury, Auteur ; E. S. Morton, Auteur ; W. H. Piper, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (29(1) MAR 1998)
Article en page(s) :	72-78
Langues:	Anglais
Résumé :	Extra-pair matings are now recognized as a fundamental component of avian mating systems. However, in tropical regions where breeding is typically asynchronous socially monogamous species appear to have low sperm competition and few extrapair matings. We predicted that if breeding synchrony promotes the evolution of extra-pair matings, then tropical species that breed synchronously, like the Clay-colored Robin Turdus grayi, should have abundant extra-pair young (EPY). Breeding began relatively abruptly during the dry season (Feb-Mar) in this non-migratory species, with a mean of 25% of females fertile on a given day. Overall, 53% of females produced EPY, and 38% of nestlings were EPY. Males have a long and conspicuous dawn chorus, which could be a result of intense male-male competition for extra-pair matings. Male songs are individually recognizable and males vary greatly in song output. Male song output declined significantly from the pre-nesting stage through the incubation stage, as would be expected if song is important in mate choice. Our results support the idea that breeding synchrony favors extra-pair matings, however further studies of tropical songbirds are needed to fully explore how ecology is tied to extra-pair mating systems.

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