La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Do greylag geese (Anser anser) use traditional roosts? Site fidelity of colour-marked Nordic greylag geese during spring migration
Auteurs :	H. Kruckenberg, Auteur ; J. Borbach-Jaene, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (145(2) APR 2004)
Article en page(s) :	117-122
Langues:	Anglais
Résumé :	In 1995 to 2000, site-fidelity of colour-marked Nordic greylag geese (Anser anser) was examined during spring migration in the Rheiderland, an important stopover site in NW Germany. The results demonstrated that site fidelity in greylag geese depends very much on the mating status of the geese. Paired birds showed a significantly higher site fidelity than unpaired adults. There was no difference in the length of the roosting period between the two social groups. The year-to-year return rate of individuals showed significant differences in relation to the individual breeding success. Birds with high numbers of young showed a significantly higher return rate than birds with low numbers of young.

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