The midsummer crustacean plankton communities of seven small impoundments

The crustacean zooplankton communities of seven, small, eutrophic West Virginian impoundments were examined during midsummer. The more eutrophic lakes had as dominants, 2 cyclopoid, 1 calanoid, and 2 cladoceran species. Cluster analysis showed that the 4 more eutrophic lakes clustered together, further cluster analysis showed there was a very similar group of 5 species which characterized the most eutrophic lakes. Principal components analysis showed that the more eutrophic lakes were characterized by having more cyclopoids and cladocerans than calanoids. Niche breadth showed that the most often dominant species had much higher values than the species ohich could be considered secondary dominants.