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Human activities have made a big impact on Marehalli Lake, Karnataka, India. This study was carried out during August 2018 to July 2020 to cover all seasons in rendemly selected 04 sampling plots. The study examined the level of pollutions by observing the zooplanktons in quantitative method which includes diversity, distribution and physico-chemical factors for consecutive 24 months.

Sample analysis elucidated the existence of zooplankton species including Rotifers, Cladocera, Copepods, and Ostracods. Rotifera dominated the average for the entire group. The summer season had the largest diversity of rotifers, cladocera, copepods, and ostracods, while the winter season had the lowest. The summer season also had the highest density. It's worth noting that the Marehalli lake is slowly transitioning into a mesotrophic environment.

Marehalli lake, physico-chemical parameter, seasonal variation, zooplankton

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