Seasonal variations in the trophic structure of phyto-and zooplankton communities in lakes in different trophic states |
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| Authors: | H R Bürgi Pia Weber H Bachmann |
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| Institution: | (1) Institute for Water Resources and Water Pollution Control, EAWAG, Swiss Federal Institute of Technology, Zürich;(2) Present address: Limnological Department, EAWAG, überlandstrasse 133, CH-8600 Dübendorf, Switzerland |
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| Abstract: | A number of environmental factors are important in regulating the trophic structure of plankton. Increased nutrient supply results in an explosive development of small algae and herbivorous zooplankton. In the eutrophic lakes (Greifensee, Hallwilersee) several algal community collapses occur each year as a consequence of the grazing habit of the zooplankton, although only the grazing phase in May/June results in a ‘clear water period’. Vertical mixing influences the zooplankton community by reactivating the resting stages of predatory copepods. Predation phases can only be observed in lake Lucerne, where the hypolimnion ist deep and aerobic. Well balanced relationships between the different trophic levels are restricted to the phases with growth limiting conditions. |
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