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Water quality parameters play an important and major role in determining the diversity of phytoplankton in any aquatic ecosystem. The present study was conducted to measure the correlation between various physico-chemical parameters and phytoplankton assemblages structure in selected zones of the Tehri reservoir. Results of the present study clearly showed an increased concentration of some physico-chemical parameters i.e. total dissolved solids, turbidity, and electric conductivity during the monsoon season which has a contrary influence on the density of phytoplankton. The multi correlation was also calculated between important physico-chemical parameters and phytoplankton density. Dissolved oxygen showed a very high positive correlation with phytoplankton diversity. It was also observed that during the monsoon season, a high load of sediment in the reservoir area affects the growth of phytoplankton and also decrease their number. Canonical Correspondence Analysis (CCA) was calculated between some important water quality parameters and dominant taxa of phytoplankton which indicated the direct influence of various physico-chemical parameters on diversity and distribution of phytoplankton in Tehri reservoir at Garhwal Himalayas. Keyword Phytoplankton, Water quality, Tehri reservoir, and Garhwal Himalayas.

Water quality and its impact on phytoplankton diversity: A case study of tehri reservoir, Garhwal Himalayas