La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Morphometrics of the Chinese grouse Bonasa sewerzowi
Auteurs :	Y. H. Sun, Auteur ; Y. Fang, Auteur ; J. E. Swenson, Auteur ; S. Klaus, Auteur ; G. M. Zheng, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (146(1) JAN 2005)
Article en page(s) :	24-26
Langues:	Anglais
Résumé :	We report on the body size and mass and egg size and mass of the Chinese grouse ( Bonasa sewerzowi), one of the least known grouse in the world. Although reported to be the smallest grouse in the world, not enough data have been available to substantiate this claim. We document that the Chinese grouse is, in fact, the smallest grouse in the world. It shows significant changes in body mass between the reproductive and nonreproductive season ( males average 310 g in the reproductive season and 341 g in the nonreproductive season; females averaged 338 and 315 g, respectively). Egg mass averages 20.6 - 21.6 g and shows significant annual variation. The Chinese grouse shows some of the highest relative reproductive investment among grouse, both for egg mass ( 6.1 - 6.9% of female body mass) and clutch mass ( 38 - 43%).

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