La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Breeding density and brood size of Common Buzzard Buteo buteo in relation to snow cover in spring
Auteurs :	V. Selas, Auteur
Type de document :	Article
Dans :	Ardea (89(3) 2001)
Article en page(s) :	471-479
Résumé :	In a 500 km(2) study area situated 100-400 m above sea level in southern Norway, breeding density and offspring production of Common Buzzard Buteo buteo was studied in relation to snow depth in spring during 1985-97. Because a thick snow layer will reduce the availability of the preferred prey, Field Vote Microtus agrestis, snow may reduce both Common Buzzard breeding density and offspring production. In the study area, where snow depth in spring increases with increasing elevation, there is a marked rise in mean altitude from 160 to 200 m approximately

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