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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Habitat utilization of an Eagle Owl Bubo bubo in the district Weissenburg-Gunzenhausen/Bavaria
Auteurs :	Marc Sitkewitz, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (44(2-3) DEC 2005)
Article en page(s) :	163-170
Résumé :	This telemetry-study deals with the survival and habitat utilization of the Eagle Owl in the district Weissenburg-Gunzenhausen / Bavaria. Therefore one adult male was caught and successfully radiotagged. Home range size and habitat utilization were investigated during the period winter 2004/2005 and spring/summer 2005, by radiotracking. The evaluation of the telemetry data and photograph evaluation integrated was realized with Arc View GIS. The overall home range (Maximum-Convex-Polygon) during winter was 20.49 km(2) and 9.27 km(2) during spring/summer. The Core-Convex-Polygon (95 % of the locations) was much smaller: 13.98 km(2) during winter and 6.0 km(2) during spring/summer. Compared to other studies (e.g. Leditznig 1999) these values are small. The analysis of habitat utilization and habitat selection shows that open habitat types such as surfaces with only low vegetation cover, grassland and agricultural areas were preferably used for hunting. Another important point is, if open habitat types border on woodland or at least single trees/poles are available. Adjoining areas of woodland and areas with single trees/poles offer perches. Additionally adjoining woodland offers a higher availability of prey to hunt from. Agricultural areas were used related to the increasing stage of vegetation growth less. Flowing waters were highly preferred.

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