La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Occurrence of the Red-backed Shrike Lanius collurio in Dachau/Bavariaand the surrounding area from 1985 to 2004.
Auteurs :	Hans-Joachim Hage, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (44(1) JUL 2005)
Article en page(s) :	31-44
Résumé :	This is a survey of the development of the Red-backed Shrike population Lanius collurio in Dachau/Bavaria and the surrounding area since 1985. Up to 1995 registration only took place in a small scale because at that time nobody had thought about taking stock. Hence, there was only qualitative recording. The study area covers an area of about - 1188 km(2) and >= 0,08 Shrike territories/km(2) were found in the years 1996,2003 and 2004. Population sizes on the 12 Top maps affected differ a lot. They range from 0.01 to 0.23 territories/map (map area = 137 km(2)). Looking at bibliographical references the study area seems to be rather thinly populated. One reason could be the intensive agricultural exploitation.The main topic of this study are the hedges planted by the Flurbereinigung and other institutions, which seem to have only a small long-term ecological value. In addition, asphalting some of the field tracks in the study area will presumably lead to a further decline of the Red-backed Shrike population.

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