La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Post-fledging dispersal of Sparrowhawks in Vendsyssel, Denmark
Auteurs :	Jan Tottrup Nielsen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (102(3) 2008)
Article en page(s) :	280-288
Langues:	Anglais
Résumé :	A long-term study of Sparrowhawks Accipiter nisus in northern Jutland, Denmark, was conducted during 1977-1997. Recoveries of 401 nestlings ringed during the project - 188 males, 183 females - were analysed. The pattern and probability of recovery did not differ between the sexes, except that more females (30) were recovered during the second year of life than males (9) (P = 0.0002). Numbers during the first year of life (116, 139), and after the second year (37, 40), did not differ between sexes (P = 0.82 and 0.85, respectively).Most of the recovered Sparrowhawks were found in (79%) or near (14%) the study area. Only 8 birds (2%) were found outside of Denmark (the farthest 846 kin away, in Belgium), and only one of these was a male. This difference between sexes reflects a general tendency of females to disperse farther than males (Fig. 2), the median distance during the first 9 months being 30.1 kin and 12.4 kna for females and males, respectively, and for recoveries after 9 months 11.5 and 21.8 km. In both cases the difference between the sexes was statistically significant (P

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