La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[Monnitoring of geese in Germany and the Western Palearctic from 1950 to 1995]
Auteurs :	Johan H. Mooij, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(5-6) 2000)
Article en page(s) :	319-330
Résumé :	Since the middle of the 19th century there has been a dramatic decrease in waterbird numbers both in Eurasia and North America. Between 1850 and 1950, the number of breeding waterbirds in the former USSR decreased to one third of its original level. During the same period a dramatic decline of migratory geese was reported from most parts of Europe and North America. In order to collect reliable data about population sizes and trends for water-birds in Europe, systematic waterbird counts were initiated during the 1930s. Since 1963 the census programme International Waterbird Census (IWC) has been co-ordinated by Wetlands International. In Germany, TWC counts have been performed for more than

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