La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	[The distribution of the breeding population of Mergus merganser in southern Bavaria and Austria in relation to the water-transparency of representative rivers in the breeding area]
Auteurs :	Aurelia Gross, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (39(2-3) September, 2000)
Article en page(s) :	97-118
Résumé :	The abundance and distibution of breeding Mergus merganser in southern Bavaria and Austria was analysed. Over the last seven decades the development was correlated with the annual mud content of six representative rivers in the breeding area. It could be shown that the water-transparency has an influence on the breeding population. The number of breeding goosanders increased on four of the analysed rivers in response to an increasing water-transparency after several water-economical impacts. The muddy glacier waters of Inn and Salzach showed almost no changes in their low water-transparency in the last centuries and in fact there was no increase in the anyway very small number of breeding goosanders. The results also showed that a mud content above 180 mg/l seems to be not tolerable for Mergus merganser in the breeding season.

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