La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[Tree-breeding jackdaws (Corvus monedula) in the Inn-Chiemsee region]
Auteurs :	Bernd-Ulrich Rudolph, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (39(2-3) September, 2000)
Article en page(s) :	207-215
Résumé :	In this study the breeding population of jackdaws in a part of southern Bavaria (770 km2) was examined. I found approx. 150 breeding pairs (this means a population density of 0.19 BP/km2). About 20 % of the population are nesting in buildings and 80 % in forests. Colonies in forests are situated in holes of the Black Woodpecker in small beech forests. 31 colonies in forests had a mean size of 3.6 breeding pairs. The number of tree-breeding jackdaws seems to be limited by the number of nesting sites of the Black Woodpecker. They are threatened because beech forests in the investigation area are rare and of small size. Furthermore these beech forests are in the appropriate age for forestry use.

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