Effect of eutrophication on species composition and growth of freshwater mussels(Mollusca,Unionidae) in Lake Hallwil (Aargau,Switzerland) |
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| Authors: | Hubert E Arter |
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| Institution: | (1) Inst. für Pflanzenbiologie, Zollikerstraße 107, CH-8008 Zürich, Switzerland |
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| Abstract: | Species composition, relative abundance and life history of unionid mussels are compared between 1982–86 and 1915–19 in Lake Hallwil and the outflowing brook. The recent samples of unionid mussels were collected by divers, whereas the older ones were from a shell collection. The motivation for the comparison was that the trophic degree of the lake has changed since the beginning of the century from mesotrophic to highly eutrophic. The effects of this increased trophic degree of the lake on the life cycle of unionid mussels is discussed. Predictions are made about species composition and life history in the context of the ongoing lake restoration by the authorities. |
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| Keywords: | Unionidae life history eutrophication |
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