Abstract
Diatom analyses with an annual resolution were carried out on varves of the hypertrophic Baldeggersee
(Central Swiss Plateau) for the timespan ad 1885 to 1993. They reveal seven major changes in the
dominant planktonic diatoms. As a result of progressive nutrient enrichment, Baldeggersee changed in the
1910s from a Cyclotella to a Tabellaria
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