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IMPACT OF PLANKTON DIVERSITY ON THE WATER QUALITY INDEX IN A LAKE AT THIRUMAKUDAL NARASIPURA MYSORE DISTRICT

Shankar.P. Hosmani, T.B. Mruthunjaya

The relationship between Water Quality Index (WQI) and the plankton diversity in polluted lake (Alagudu Lake) of Mysore district has been studied. Eight physico-chemical parameters and 21 plankton species were considered for the study. ISO 3166 alpha 2 coding was applied to the lake. The quality of water was rated as good for only two months, while it was rated as medium for rest of the months. Very few plankton species dominated the lake and had no significant impact on the WQI. Navicula veneta, Navicula rhynococephala, Nitzschia punctata, Gomphonema hybridense and Pinnularia achrosphaeria were the principal components of the lake water. Among the physicochemical parameters, total nitrogen and change in water temperature had a major role. WQI is mainly determined by the physical and chemical parameters.