La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Vigilance behaviour of American Wigeon Anas americana foraging in pastures
Auteurs :	Jacob L. Berl, Auteur ; Jeffrey M. Black, Auteur
Type de document :	Article
Dans :	Wildfowl (61 2011)
Article en page(s) :	142-151
Langues:	Anglais
Résumé :	Observations were made of feeding American Wigeon Anas americana to assess their vigilance levels in relation to foraging location. American Wigeon increased vigilance levels: 1) while foraging on land compared to on water, 2) while grazing progressively further away from a water source, and 3) after being on land for long periods of time. Vigilance patterns were nearly identical to those recorded for Eurasian Wigeon Anas penelope in earlier studies. Males were more vigilant than females when foraging on land. This study contributes to understanding the importance of ephemeral pond habitats to grazing American Wigeon, which are used as anti-predator refuges by actively feeding flocks.

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