Trophic relationships in the pelagic zone of Mondsee,Austria |
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Authors: | Martin Dokulil Alois Herzig Albert Jagsch |
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Institution: | (1) Institut für Limnologie der Österreichischen Akademie der Wissenschaften, Gaisberg 116, A-5310 Mondsee, Austria;(2) Biologische Station Illmitz, Forschungsinstitut für das Burgenland, A-7142 Illmitz, Austria;(3) Bundesanstalt für Fischereiwirtschaft, A-5310 Scharfling, Austria |
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Abstract: | Data are presented on nutrient concentrations, phytoplankton biovolume development, zooplankton composition and population dynamics, and fish from a deep, stratifying, alpine lake (Mondsee, Austria) during a three-year period between 1982 and 1984. Development of the phytoplankton is closely related to structuring events of the physico-chemical environment. Dissolved silicate and phosphorus concentrations are critical for the summer situation. During summer algal abundance is largely affected by grazing of zooplankton, but no clear-water phase was observed at the end of the spring peak of phytoplankton.Temperature and food are factors responsible for the timing and growth of the zooplankton populations. Because of close overlap in the epilimnion, exploitative and mechanical interference competition and predation by invertebrate and vertebrate predators are the main structuring forces acting on the zooplankton community, and hence influence phytoplankton indirectly. |
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Keywords: | trophic interactions pelagic zone seasonal succession lakes ecology |
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