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Plankton community structure in Lake St. Clair, 1984

  • Lake St. Clair
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Abstract

Spatial and seasonal patterns in phytoplankton and zooplankton communities of Lake St. Clair from June through September, 1984 are described. Phytoplankton biomass averages 586 µg l-1 with the Diatomae and Chrysophyceae predominating. Zooplankton biomass averages 663 µg l- with small bosminid Cladocera being the most abundant organisms. Lake St. Clair zooplankton biomass is second only to that of Lake Erie amongst the St. Lawrence Great Lakes. Biomass size spectra are typical in structure for mesotrophic lakes but low explained variance in the annual normalized spectrum is indicative of a perturbed system. Since 1972/1973 there appears to have been a slight decrease in zooplankton abundance in the lake accompanied by a shift from dominance of rotifers to dominance of cladocerans. We hypothesize that high flushing rate and seasonal variability coupled with contaminant loadings have resulted in a plankton community reduced in taxonomic diversity and dominated by small-bodied species.

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Sprules, W.G., Munawar, M. Plankton community structure in Lake St. Clair, 1984. Hydrobiologia 219, 229–237 (1991). https://doi.org/10.1007/BF00024757

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