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Strong impact of wintering waterbirds on zebra mussel (Dreissena polymorpha) populations at Lake Constance, Germany

Strong impact of wintering waterbirds on zebra mussel (Dreissena polymorpha) populations at Lake Constance, Germany

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WERNER, Stefan, Martin MÖRTL, Hans-Günther BAUER, Karl-Otto ROTHHAUPT, 2005. Strong impact of wintering waterbirds on zebra mussel (Dreissena polymorpha) populations at Lake Constance, Germany. In: Freshwater Biology. Wiley-Blackwell. 50(8), pp. 1412-1426. ISSN 0046-5070. eISSN 1365-2427. Available under: doi: 10.1111/j.1365-2427.2005.01411.x

@article{Werner2005-08Stron-50138, title={Strong impact of wintering waterbirds on zebra mussel (Dreissena polymorpha) populations at Lake Constance, Germany}, year={2005}, doi={10.1111/j.1365-2427.2005.01411.x}, number={8}, volume={50}, issn={0046-5070}, journal={Freshwater Biology}, pages={1412--1426}, author={Werner, Stefan and Mörtl, Martin and Bauer, Hans-Günther and Rothhaupt, Karl-Otto} }

Bauer, Hans-Günther terms-of-use 1. Since zebra mussel invaded Lake Constance in the 1960s the number of wintering waterbirds increased fourfold. We studied the impact of predation by waterbirds (tufted duck Aythya fuligula , pochard Aythya ferina and coot Fulica atra ) on the population of Dreissena polymorpha in winter 2001/2002. These three species, with monthly peak numbers of approximately 230 000 individuals, currently comprise up to 80% of the waterbird population wintering at Lake Constance.<br /><br />2. Four different study sites and four depths, that represent typical and characteristic habitats of mussels in Upper Lake Constance, were chosen.<br /><br />3. Zebra mussels were sampled before, during and after predation by waterbirds. Their biomass in shallow areas decreased by >90%; the biomass reduction in deeper areas was highly variable and dependent on the substratum. With one exception, no changes could be detected at the greatest depth (11 m).<br /><br />4. Concurrent exclosure studies revealed that the decrease in zebra mussels was caused by waterbird predation. A GIS‐based approximation revealed that in an area of 1 km<sup>2</sup> a total of approximately 750 t mussel fresh mass was removed by birds, which is equivalent to 1390 g mussels per bird per day.<br /><br />5. Wintering waterbirds have a strong structural impact on the littoral community of Lake Constance and could be the key predator of zebra mussels. eng Mörtl, Martin 2005-08 Werner, Stefan Mörtl, Martin Rothhaupt, Karl-Otto Rothhaupt, Karl-Otto Bauer, Hans-Günther 2020-07-06T12:24:22Z Werner, Stefan Strong impact of wintering waterbirds on zebra mussel (Dreissena polymorpha) populations at Lake Constance, Germany 2020-07-06T12:24:22Z

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