La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Juvenile dispersal and mortality factors in Swiss Eagle owls Bubo bubo
Auteurs :	Adrian Aebischer, Auteur ; Peter Nyffeler, Auteur ; Silvia Koch, Auteur ; Raphaël Arlettaz, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (44(2-3) DEC 2005)
Article en page(s) :	197-200
Résumé :	In order to better understand the population dynamics of the Eagle Owl in Switzerland, the mortality factors of 228 dead individuals were analysed, and the dispersal of 36 young was studied by means of satellite telemetry and by conventional radio tracking. The mortality factors of incidentally found individuals and of tracked individuals were compared.The most important mortality factors of found Eagle owls were electrocution (33 % of all cases) and car and train accident (27 %). Most young died between September and November (i.e. during juvenile dispersal). 76 % of all individuals died during the first 3 calendar years. In the radiotracked individuals tile figures were somewhat different: 19 % died due to electrocution, 6 % by traffic accidents and

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