Untersuchungen über die Bodenfauna des Litorals im eutrophierenden Sempachersee |
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| Authors: | Dr Peter Perret |
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| Institution: | 1. Zoologische Anstalt der Universit?t Basel, Basel, Schweiz
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| Abstract: | The Sempachersee (Switzerland), a facultatively oligomictic lake with visibility measuring according to Secchi of between
1.3 m and 12.9 m, is characterized by an oxygen minimum of 4 mg O2/l in the metalimnion in autumn and an almost total lack of oxygen in the greatest depths of the lake. Phosphate-phosphorus
is used up in the trophogenic zone and is found in quantities of between 20 and 24 μg/l during the overturn period. Nitrate-nitrogen
concentrations of between 0.55 and 0.6 mg/l are also present during overturn. Phanerogamic growth along the shore is sparse;
the variety of animal species as well as the respective number of organisms are limited although the reason for this has not
been determined.
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