Quantitative assessment of plankton was carried out in distinct sites of the river Krishna, district Sangli during January 2011 to December 2012. Phytoplankton diversity was observed in five groups, that is, Cyanophyceae, Bacillariophyceae, Chlorophyceae, Hydrocharitaceae and Desmidiceae including 53 species. Among them, Chlorophyceae was dominating with 22 species. Diversity of zooplanktons included, Cladocera, Rotifera, Protozoa, Nematoda, Aostraca, Schizopyrenida and Copepoda as major groups with 25 genera. Rotiferans were dominating with 9 diversified species. The relationship between plankton, diversity indices and water quality status of the river systems was discussed.
Key words: Planktonic diversity, pollution, Krishna River.
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