La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A test of the wintering strategy hypothesis with teal (Anas crecca) ringed in the Camargue, southern France.
Auteurs :	Matthieu Guillemain, Auteur ; O. Dehorter, Auteur ; Alan R. Johnson, Auteur ; G. Simon, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (146(2) APR 2005)
Article en page(s) :	184-187
Langues:	Anglais
Résumé :	Body mass changes in wintering ducks have been considered as the consequence of their "wintering strategy", i.e. low mass after autumn migration, active foraging leading to body mass restoration, then pairing leading to low body mass again. This pattern is supported by weights of hunter-killed birds, but this is not enough to rule out potential alternative hypotheses linked to the existence of different populations with different body masses. The use of data collected at ringing and subsequent recaptures of known birds demonstrates that teal (Anas crecca) gain and lose body mass from September to March.

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