Abstract
Physico-chemical parameters of Venkammacheruvu in Veeraghattam, Andhra Pradesh, have been studied to understand the phytoplankton composition for twelve months (May 2014 to April 2015). A total of 75 genera belongs to four major groups such as chlorophyceae (32 ) Bacillariophyceae ( 16) Cyanophyceae (23) and Euglenophyceae (4 ) were reported. The phytoplanktonic concentration decreased during monsoon season, but increased rapidly with decline in water current and turbidity during post-monsoon months. The lower values for the plankton communities during monsoon season may be attributed to high inflow of water from the catchment area changing the hydrology of the system as a result of dilution. Hydrological and chemical parameters such as temperature, pH, EC,DO,BOD, total alkalinity, total hardness, calcium and magnesium hardness, chloride, phosphate, sulphate, nitrate and plankton composition were studied. Atmospheric temperature, water temperature, turbidity, nitrates, phosphates and magnesium of the study area has been shown to influence the phytoplankton composition in the lake studied.
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