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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Nest helpers improve parental survival but not offspring production in a high-elevation passerine, the Ground Tit Pseudopodoces humilis (2016)
Auteurs :	Yinhui Li, Auteur ; Shaobin Li, Auteur ; Cheng Guo, Auteur ; Guoyue Zhang, Auteur ; Yang Zhou, Auteur ; Xin Lu, Auteur
Type de document :	Article
Dans :	Ibis (158(3) July 2016)
Article en page(s) :	567-574
Langues:	Anglais
Mots-clés:	Tibetan plateau ; cooperative breeding ; helper effect ; life history strategy
Résumé :	The way in which breeders respond to helping, in terms of either offspring production or their own survival, may reflect the adaptive aspects of a cooperative breeding system. We explore this issue using a 5-year study of the Ground Tit Pseudopodoces humilis, a facultative cooperative breeder in which 47% of socially monogamous pairs have between one and four close male relatives as helpers. We found that helped nests did not fledge more or heavier nestlings than unhelped nests, and male young from helped and unhelped nests were equally likely to recruit into the local breeding population. However, helped parents of both sexes had a higher probability of survival to the following year than did unhelped parents. These findings suggest that Ground Tit parents with helpers trade current reproduction for personal survival and future reproduction, a strategy favoured by selection to cope with harsh, unpredictable environments such as the Tibetan Plateau.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/ibi.12266/abstract

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