Original Article

Journal of Ornithology

, Volume 146, Issue 2, pp 184-187

First online:

A test of the wintering strategy hypothesis with teal (Anas crecca) ringed in the Camargue, southern France.

  • Matthieu GuillemainAffiliated withCNERA Avifaune Migratrice, Office National de la Chasse et de la Faune Sauvage Email author 
  • , Olivier DehorterAffiliated withCentre de Recherches sur la Biologie des Populations d’Oiseaux, Muséum National d’Histoire Naturelle
  • , Alan R. JohnsonAffiliated withStation Biologique de la Tour du Valat
  • , Géraldine SimonAffiliated withStation Biologique de la Tour du Valat

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Abstract

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.

Keywords

Anas crecca Body mass Camargue Teal Wintering strategy