La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Ringing of Eagle Owls - up to date nowadays?
Auteurs :	Wolfgang Fiedler, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (44(2-3) DEC 2005)
Article en page(s) :	171-176
Résumé :	Between 1962 and 2004 1990 Eagle Owls have been ringed in Southern Germany and Austria (the area of resonsibility of the Bird Ringing Centre at Vogelwarte Radolfzell, Germany). From those birds 221 recoveries (11 %) are reported. 60 % of all Eagle Owls are recovered in a radius of less than 50 km from the place of ringing (in most cases the nest) and only very few recoveries showed distances above 100 kin. Despite these reults describing the Eagle Owl in Central Europe as a species with a strongly limited potential for a mid- or long distance dispersal bird ringing (and to some extent other means of individual marking) is the crucial method for many studies on this species. Especially the potential of bird ringing for studies of population structure, population dynamics, dispersal, survival and mortality, and ecoethological questions are presented. Key prerequisites for future ringing studies on Eagle Owls are (1) restriction to defined study areas which are treated as constantly as possible and which should not contain less than 10 breeding pairs, (2) a ringing rate as high as possible within the defined study areas, (3) a recovery and resighting rate as high as possible and (4) complete embedding of those ringing studies in regional species conservation projects.

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