La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Weather and body condition in wintering Mallards Anas platyrhynchos (2007)
Auteurs :	Mathieu Boos, Auteur ; Thierry Zorn, Auteur ; Gilles Delacour, Auteur ; Jean-Patrice Robin, Auteur
Type de document :	Article
Dans :	Bird Study (54 MAR 2007)
Article en page(s) :	154-159
Langues:	Anglais
Résumé :	Capsule Body condition in midwinter appears to be independent of climatic conditions. Aims To assess the long-term impact of climatic conditions on body stores, during the winter. Method Body reserves of male and female Mallards were determined in January over nine years on the same area of the Rhine River in Alsace, then related to ambient temperatures, water conditions, dietary indexes and potential for fasting endurance. Results Body mass, potential for fasting endurance, body lipids and proteins did not change significantly over the nine years (P > 0.05). Body reserves were not related to the extent of flooded areas (P > 0.10) or to ambient temperatures (P > 0.67) prevailing ten or 20 days before bird collection. In 1997 the occurrence of the severest cold spell for

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