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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The Eagle Owl in the Hersbrucker Schweiz/Bavaria 2003
Auteurs :	Rainer Brand, Auteur ; Ulrich Lanz, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (44(2-3) DEC 2005)
Article en page(s) :	147-152
Résumé :	Between March and October 2003 population numbers and breeding success of the Eagle Owl (Bubo bubo) were recorded in the "Hersbrucker Schweiz", a low mountain range east of Nuernberg of about 920 km(2). Aditionally the 15 current or former territories, which could be ascertained there by a survey among ornithologists, hunters, nature conservation authorities and forestry offices, were checked as for the proportions of important habitat elements.In 2003 seven territories were inhabited by at least single Eagle Owls, but only in one territory a pair was found. Broods were not detected at all in 2003. These results might be biased though by the exceptionally low courtship activity among Eagle Owls throughout the whole Upper Franconia in 2003, where also only very few broods became known during the study period. The long-term data for the study area gathered during this project, are too fragmentary to discuss population trends.Within a hypothetical circular territory around the respective breeding sites of 1,0 km(2) a mean proportion of 62.2 % forests, 27.4 % agricultural area, 5.2 % urban and 5.2 % of other habitat elements was found, though the differences between territories are large. It seems as if Eagle Owls would prefer in the study area territories with a proportion of forest as low and of open grassland and fields as high as possible. Besides a large proportion of small woods and hedges in the open landscape probably is of large influence on the overall habitat quality, too. Yet these latter results still have to be regarded as preliminary, since they rely only oil study period too short for reliable conclusions.

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