Abstract:

Kalki Cheruvu, a freshwater ecosystem, was investigated to understand the relationship between phytoplankton diversity and physico‑chemical parameters. Phytoplankton distribution is closely regulated by hydrochemical and physical variables, which directly influence population dynamics and community composition. Monthly sampling was conducted from 2023 TO 2024, following APHA (2005)[1] protocols, to analyse parameters such as temperature, pH, carbonates, bicarbonates, total hardness, chlorides, phosphates, nitrates, nitrites, silicates, dissolved oxygen, biological oxygen demand, and organic matter. Four algal groups were identified: Chlorophyceae, Cyanophyceae, Bacillariophyceae, and Euglenophyceae. Among these, Chlorophyceae was the most dominant, followed by Cyanophyceae, Bacillariophyceae, and Euglenophyceae, reflecting the ecological status of the lake. The study revealed significant seasonal variation in water quality parameters, though most values remained within permissible limits, indicating good water quality. Overall, the findings suggest that Kalki Cheruvu supports a healthy phytoplankton community and provides water suitable for drinking purposes. This work highlights the importance of continuous monitoring of freshwater ecosystems to ensure ecological balance and sustainable utilisation