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On the significance of Paleolimnological studies of ancient lakes Lake
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abundance acid activity adenylate algal analysis aquatic As(III average bacteria basin biological biomass bloom blue-green algae Bosmina bottom calculated carbon cells changes chemical chironomid chlorophyll chlorophyll-a coefficient concentration correlation Daphnia decreased density depth diatoms dissolved distribution ecological ecosystem energy epilimnion estimated euphotic zone experiments Fallen Leaf Lake fish fraction freshwater Goldman groundwater growth hypolimnetic hypolimnion increase inflow Internat Japan Lake Biwa Lake Kasumigaura lake sediments Lake Suwa Lake Tahoe lake water layer Limnol limnological loading maximum measured method Microcystis mixing Mysis nitrate nitrogen nutrient observed Oceanogr oligotrophic organic matter oxygen Paajarvi particulate period periphyton phosphate phosphorus photosynthetic phytoplankton plankton population primary production ratio river samples Schweizerbart'sche Verlagsbuchhandlung seasonal shown in Fig species Station Stuttgart summer surface Table text Introduction thermocline tion trophic uptake urea values varve Verein Verh vertical water quality water temperature zoobenthos zooplankton