The physico-chemical and phytoplankton characteristics of the Tons River were analyzed during August 2011-July 2012. The samples were collected from Garhi Cant (Site 1) and Tapkeshwar temple (Site 2) at Dehradun. The results showed that temperature, velocity, DO, nitrate and phosphate affected the phytoplanktonic diversity of river Tons. Thirty five genera of phytoplankton belonging to three families of Chlorophyceae, Bacillariophyceae and Myxophyceae were also identified in the river water. The family Bacillariophyceae was dominating the river with much abundance throughout the study period. Bacillariophyceae was recorded with the maximum of 222.25Â±90.84 Unit/L at sampling site 1 and 239.08Â±125.41 Unit/L at sampling site 2. The greater number of individuals was in family Bacillariophyceae (239.08Â±125.41 Unit/L) followed by Chlorophyceae (183.75Â±112.50 Unit/L) and Myxophyceae
(40.91Â±36.16 Unit/L) during the study period. Both the number of genera and number of individuals belonging to each genera was maximum in case of family Bacillariophyceae followed by Chlorophyceae and Myxophyceae. The present study revealed that the water quality of river Tons was fairly good for the growth and survival of phytoplankton, and as a result it sustains the higher phytoplankton diversity of Tons river.
Physico-chemical characteristics, Phytoplankton abundance, Pearson correlation coefficient, River Tons
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