This work aimed to determine the limnological status of the Bharathapuzha river basin using the physicochemical and biological parameters (phytoplankton) throughout the period from November 2018 to October 2019. A total of 168 species were identified, belonging to five different classes, Bacillariophyceae, Chlorophyceae, Euglenophyceae, Dinophyceae, and Cyanophyceae. The most dominant classes obtained from the study area are Bacillariophyceae, Chlorophyceae and Euglenophyceae. The present study revealed that species distribution depends upon the physico-chemical parameters and attained their maximum density during pre-monsoon, whereas minimum populations were observed during monsoon. The diversity profile was higher during pre-monsoon and lower in monsoon season. Canonical Correspondence Analysis revealed that temperature, nitrate, silicate, and DO have a more significant influence on phytoplankton abundance.
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