Abstract
ABSTRACT Sampling of littoral cladoceran populations was conducted in the Fall of 1986 at four sites in Pennsylvania: a small man-made pond, a swamp, a natural glacial lake (Lake Lacawac), and an embayment of Lake Erie. Microhabitats sampled included various plant species, rocks, and the water column. Densities and percentages of individual species in the microhabitats were used to calculate community coefficients of similarity among and within microhabitats, and to perform ANOVA and SNK tests. Cladoceran communities were more similar within than between microhabitats, indicating there is significant variation in community structure among littoral microhabitats. Densities of some cladoceran species varied significantly among microhabitats. Acroperus harpae, Camptocercus rectirostris, and Pleuroxus procurvus were more abundant on plants than on rocks in the embayment. Chydorus brevilabris and Alona guttata were more abundant on Myriophyllum than Ulothrix in the pond. In Lake Lacawac, A. harpae was more abu...
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