Phytoplankton is a heterogeneous group of micro-organism and plays a major role in the food chain of aquatic ecosystems by biosynthesis of organic matter and thus they act as primary producers of food. The phytoplankton of many Indian rivers consists of diverse assemblages of major taxonomic groups. Many of these forms have different physiological and environmental requirements. During the investigation period of two years phytoplankton were collected randomly from three different sites i.e. S1, S2 and S3 of river Wainganga for qualitative and quantitative analysis. During the course of study total 31 species of phytoplankton were recorded belonging to five different classes. Seasonal analysis of plankton from this lotic water body showing wide diversity of phytoplankton. Chlorophyceae or green algae comprise an important phytoplanktonic group both in terms of abundance (15 species) and frequently occurrence and Bacillariophyceae (Diatoms) was represented by seven species. Myxophyceae or blue-green comprises of six species and Euglenophyceae were represented by two species i.e. Euglena sp. and Phacus sp. while Dinophyceae was represented by only one species of genus Ceratium.
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