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Trophic state of Lake Morat indicated by the zoobenthos the 1980-1998 trend Etat trophique du lac de Morat indique par le zoobenthos tendance 1980-1998



Trophic state of Lake Morat indicated by the zoobenthos the 1980-1998 trend Etat trophique du lac de Morat indique par le zoobenthos tendance 1980-1998



Revue Suisse de Zoologie. Juin; 1072: 233-243



Total phosphorus concentrations have strongly decreased between 1982 and 1998 in the water of Lake Morat (Switzerland). In response to this improvement, the numbers of tubificids (Tubifex tubifex and Potamothrix hammoniensis mostly) decreased in the deepest area (40-45 m), but the other species (Limnodrilus profundicola and L. hoffmeisteri) present therein, remained scarce. In contrast at a depth of 20 m, chironomid larvae (Chironomus and Procladius) and the tubificid Potamothrix moldaviensis became more abundant in 1998. These changes indicated a slow improvement of benthic conditions but, in 1998, the zoobenthos was always characteristic for a eutrophic lake.

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