This study investigated the seasonal variations in physico-chemical parameters and their impact on phytoplankton diversity, community structure, and abundance in Bibinagar Lake from May 2021 to April 2022. Key parameters analyzed included temperature, turbidity, pH, electrical conductance, total dissolved solids (TDS), total hardness, dissolved oxygen (DO), biochemical oxygen demand (BOD), and chemical oxygen demand (COD). Significant seasonal fluctuations were observed, with temperature ranging from 16.2°C to 18.8°C, turbidity peaking during monsoon runoff, and variations in pH, conductance, and hardness. Elevated BOD and COD levels in late months indicated increased organic pollution. Despite these fluctuations, most parameters stayed within normal ranges, suggesting generally good water quality. The study underscores the dynamic nature of water quality and highlights the importance of continuous monitoring to manage pollution and protect aquatic ecosystems.
