La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Breeding ecology of Spectacled Eiders Somateria fischeri in Northern Alaska
Auteurs :	J. Bart, Auteur ; S. L. Earnst, Auteur
Type de document :	Article
Dans :	Wildfowl (55 2005)
Article en page(s) :	83-98
Langues:	Anglais
Résumé :	Spectacled Eiders Somateria fischeri were studied on the Colville River delta during 1994-1999, prior to oil field development, to document aspects of breeding biology that are poorly known, especially for northern-nesting populations. Both sexes arrived June 6-12; many males remained for only about 10 days. Density on the 178-km(2) study area was 0.48 birds/km(2), comparable to densities reported from extensive surveys in western Alaska and Russia. Wetlands with numerous islands and peninsulas were utilised prior to incubation, a little-studied period. Females spent considerably more time feeding than males (56% vs. 18%). Males travelled, rested and were alert more than females, and actively defended females from intruding males. Whole nest survival was 31% and varied substantially between years, as has been demonstrated in other studies. Brood size showed no detectable decline from hatch about July

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