La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Wintering waterbirds in the Cologne area, Germany: Mallards only?
Auteurs :	Stefan R. Sudmann, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (121(4) 2000)
Article en page(s) :	183-188
Résumé :	Waterbird counts in the Cologne area, Germany in the winters 1993/1994 to 1998/99 showed that large numbers of waterfowl stage and winter on waters used or created by man as well as on more natural waterbodies. During the study period, 39 species of waterbirds were recorded, 25 of which occurred in every winter. The percentage of non-native species (28%) was very high. Seven species occurred in large numbers and for prolonged periods of time in the area. Mute Swan, Mallard, and Moorhen preferred waterbodies in parks; Great Crested Grebe, Pochard, Tufted Duck, and Coot used only lakes in gravel pits during normal winters and retreated to the river Rhine only in cold winters when standing water was frozen. Waterbird counts in Berlin and Cologne during the same period of years yielded similar results. In both areas the numbers of Moorhen decreased dramatically during the cold winters of 1995/96 and 1996/97. Because this species is rarely observed in monitoring projects of waterbirds, counts on waterbirds in urban areas may be important as a means of monitoring this species.

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