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An endemic diatom, Cyclotella rhomboideo‐ellipticaSkuja, from the Yunnan Plateau, has been disappearing gradually from some lakes of the plateau. This study investigated the diatom's distribution in 30 lakes and documents long‐term population changes in the paleolimnological record of a deep lake, Lake Fuxian. Living cells of C. rhomboideo‐elliptica were found in five Yunnan Plateau lakes in 1957,...
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