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Multiple paternity in socially monogamous prairie voles (Microtus ochrogaster)

Publication: Canadian Journal of Zoology
October 2004

Abstract

Prairie voles (Microtus ochrogaster (Wagner, 1842)) exhibit behavioral, morphological, and neuroendocrinological traits associated with monogamy and are considered a model system to examine the biological foundations of monogamy in mammals. We examined allelic polymorphism at microsatellite loci to assess mating exclusivity in wild prairie voles sampled in east-central Illinois and found evidence of multiple paternity in five of nine litters (56%) analyzed. Thus, a female in this socially monogamous mammal with extensive mechanisms for pair bonding does not always mate solely with its partner and raises the paradox of why some pair-bonded females mate multiply.

Résumé

Les campagnols des prairies (Microtus ochrogaster (Wagner, 1842)) possèdent des caractéristiques comportementales, morphologiques et neuroendocriniennes associées à la monogamie; ils sont d'ailleurs utilisés comme système modèle pour étudier les fondements biologiques de la monogamie chez les mammifères. Nous avons examiné le polymorphisme des allèles à des locus microsatellites pour évaluer en nature l'exclusivité des accouplements chez les campagnols des prairies échantillonnés dans le centre-est de l'Illinois; nous avons trouvé des indices de paternités multiples dans cinq (56 %) des neuf nichées que nous avons analysées. Ainsi, une femelle de ce mammifère à monogamie sociale qui possède d'importants mécanismes de renforcement du couple ne s'accouple pas toujours uniquement avec son partenaire; se pose alors le paradoxe à savoir pourquoi certaines femelles vivant en couple s'accouplent avec plusieurs partenaires.[Traduit par la Rédaction]

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cover image Canadian Journal of Zoology
Canadian Journal of Zoology
Volume 82Number 10October 2004
Pages: 1667 - 1671

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Version of record online: 15 February 2011

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