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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Social organization, demography and genetic mating system of a Tibetan cooperative breeder (2017)
Auteurs :	Shiyi Tang, Auteur ; Dianhua Ke, Auteur ; Tonglei Yu, Auteur ; Changcao Wang, Auteur ; Qingtian Zhao, Auteur ; Haiying Fan, Auteur ; Guoyue Zhang, Auteur ; Chen Wang, Auteur ; Xin Lu, Auteur
Type de document :	Article
Dans :	Ibis (159(3) July 1, 2017)
Article en page(s) :	687-692
Langues:	Anglais
Mots-clés:	Inbreeding ; Tibetan Ground Tit ; ecological constraints ; evolution ; extra-pair parentage ; helping behaviour ; high altitude
Résumé :	Knowledge of cooperative breeding in birds from longitudinal studies is available only for a small proportion of species. This paper reports data from a 12-year study on the Tibetan Ground Tit Pseudopodoces humilis. On average, 27.2% (range: 13.0–36.1%) of monogamous pairs in each year contained one (85.4%) or more (14.6%) male helpers, 83.7% of which were yearlings staying on natal territories. Most helpers (89.6%) helped once and then bred independently. Adults had male-biased sex ratios, low annual survival rates (averaging 0.50) and shorter longevities (averaging 1.8 years) compared with low-altitude avian cooperative breeders, suggesting that mate shortage promotes helping behaviour in this species. Incest occurred rarely (2.1% of pairs), probably because kin recognition occurs through year-around living in family groups. There was a low level (3.1% of broods) of extra-pair parentage, which could facilitate the maintenance of cooperative breeding.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/ibi.12485/abstract

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