Development of wintering waterfowl communities during the ageing of man-made lakes

Küsters, Ekkehard (1997) Development of wintering waterfowl communities during the ageing of man-made lakes. MAGYAR VÍZIVAD KÖZLEMÉNYEK, 3. pp. 329-336. ISSN 1416-1389 (nyomtatott); 1419-6107 (elektronikus)

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Abstract

In the Donaumoos near Ingolstadt. Bavaria, a large number of gravel-pit lakes have been created during the last decades. Since the beginning of the 1980s they are under investigation with respect to the species succession of wintering waterfowl, with the increasing age of the lakes and regarding the maximum bird numbers in relation to biological and morphometric parameters of the lakes. Though even on lakes smaller than 4 ha, great numbers of birds could be seen in some cases, however as a rule lakes had to be larger than 5 ha to be attractive for waterfowl Based on the investigation of 37 lakes an equation was found, which describes the correlation between the size of a lake and the maximum bird number found. Yet this equation is valid for mesotrophic lakes only, because apart from the size of the waterbody bird numbers are influenced by the trophic state of the lake and its structure and shape.

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