La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Long-term population dynamics and decline of the Tree Sparrow Passer montanus in Baden-Wurttemberg. (2007)
Auteurs :	Wulf Gatter, Auteur
Type de document :	Article
Dans :	Vogelwarte (45(2) MAY 2007)
Article en page(s) :	109-118
Langues:	Allemand
Résumé :	For almost 60 years the Baden-Wurttemberg forestry administration has been documenting the results of its nestbox monitoring scheme. The number of boxes rose from 40,000 around 1950 to 180,000 in the 1980s/1990s. For this study, 80,412 successful nests of the Tree Sparrow Passer montanus were evaluated out of the 3,4 million nestboxes monitored up to 1996. Literature from largely the same period was consulted during preparation of this analysis. Since the Tree Sparrows in this survey mostly breed at woodland edges, but forage almost exclusively in agricultural land, the results reflect the general trend for the species in SW Germany. Until 1971 the species bred with constant occupancy rates that varied regionally between 0.5 and 5 % of all nestboxes. After that year the proportion increased, reaching rates of

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