Macrofaune des fonds de cailloux du Léman |
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| Authors: | Dr Claude Lang |
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| Institution: | (1) Present address: Conservation de la faune, rue César-Roux 37, CH-1005 Lausanne |
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| Abstract: | In Lake Geneva (Switzerland), the macrofauna of the stony lake bottom was studied in seven stations from 1969 to 1971. The
modifications in animal communities since the beginning of the century can be attributed partly to the increasing eutrophication
of the lake and partly to the introduction of new species. The stations are classified according to the structure of their
animal communities, which enables us to deduce the degree of eutrophication of each station. The analysis of factors which
influence the animals' microdistribution on lakebottom stones reveals many complicated interactions. As a result of this complexity,
further research projects were concentrated on leeches (Hirudinea) which colonize artificial substrates in imitation of the
underface of stones.Helobdella stagnalis, Erpobdella octoculata andGlossiphonia complanata form the major part of collected fauna. Density fluctuations, population structures (age groups) and quantitative relations
between these three species as well as their vertical and horizontal distribution patterns were examined in great detail.
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