La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Changes in body mass of Common Guillemots Uria aalge in southeast Scotland throughout the year: Implications for the release of cleaned birds
Auteurs :	M. P. Harris, Auteur ; S. Wanless, Auteur ; A. Webb, Auteur
Type de document :	Article
Dans :	Ringing & Migration (20(2) November, 2000)
Article en page(s) :	134-142
Résumé :	Body masses of Common Guillemots Uria aalge in southeast Scotland showed a pronounced annual cycle with birds being consistently heavier during the moult and over the winter. On average, adults were significantly heavier than immatures and males tended to be heavier than females. Masses of both breeding adults and immature birds declined during the breeding season. Comparisons of the body masses of wild birds and those released from rescue centres after treatment and cleaning, indicated that the latter were about 30% lighter, a difference which might explain why the survival prospects of such birds are currently so poor. The problems associated with setting target release masses for Guillemots are discussed.

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