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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Timing of copulations and the pattern of paternity in relation to laying order in tree swallows Tachycineta bicolor
Auteurs :	Colleen A. Barber, Auteur ; Raleigh J. Robertson, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (38(3) MAY 2007)
Article en page(s) :	249-254
Langues:	Anglais
Résumé :	It is well established that extra-pair young are present to varying degrees in nests of most avian species. However, the timing of extra-pair copulations during a female's fertile cycle is not well known, nor is how these copulations translate into the distribution of extra-pair young within the laying sequence. We determined the rates of successful within-pair copulations where at least one cloacal contact was achieved, and the number of extra-pair copulations/attempts in 17 pairs of tree swallows Tachycineta bicolor during the mornings encompassing the female's fertile period. We also examined nestling paternity with respect to laying order in eighteen mixed-paternity tree swallow broods. The rate of successful within-pair copulations peaked three days prior to a female laying her first egg, and decreased steadily throughout the laying period. We therefore predicted that extra-pair young would be more likely to hatch out of later-laid than earlier-laid eggs within a female's brood. We found no evidence of an increased frequency of extra-pair young with laying order. Instead, extra-pair young appear to be randomly distributed within the laying sequence of tree swallows.

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