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Lake trophic state, community structure and biomass of crustacean plankton

With respect to planktonic crustaceans, the controversy concerning the importance of bottom-up vs. top-down interactions as structuring agents has turned into a question of: How much of the variability may be explained by either resource or consumermediated effects (e.g. MAzuMDER 1994)? Moreover, i t was found that these interactions are superimposed by species-specific reactions influenced by the trophic state of a given lake ecosystem (e.g. UMPERT & MucK 1985). Here we study the relationship between phytoplankton and crustacean plankton over a variety of stratified temperate lakes representing a wide range in trophic state, based on long-term observations from 1978 to 1996. Using functional groups, we try to distinguish a community structure typical for oligotrophic, meso-eutrophic, and eutrophic lakes. To see the dynamic response of these groups within a trophic gradient, we further related their biomass to chlorophyll-a concentration.