La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Fitness consequences of hybridization between house sparrows (Passer domesticus) and tree sparrows (P-montanus)
Auteurs :	Erling Johan Solberg, Auteur ; Henrik Jensen, Auteur ; Thor Harald Ringsby, Auteur ; Bernt-Erik Saether, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (147(3) JUL 2006)
Article en page(s) :	504-506
Langues:	Anglais
Résumé :	Gene transfer may occur following hybridization between closely related species if hybrids are viable and able to breed with individuals of one or both of the parental species. House (Passer domesticus) and tree sparrows (P. montanus) occasionally hybridize and produce viable offspring. Previously, we concluded that male tree x house sparrow hybrids are most probably fertile based on the observation of a male F1 hybrid feeding the nestlings with a female house sparrow in two consecutive clutches. However, recent DNA analyses based on blood samples revealed that all nestlings (4) in the first clutch were sired by a neighbouring house sparrow male, whereas nestlings in the second clutch (2) were not blood sampled and most probably died before fledging. This indicates that extensive extra-pair fertilization confounded our previous conclusion, and indicates that social partnership and attending behaviour can be imprecise measures of paternity.

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