Canonical correspondence analysis (CCA) diagram of environmental variables and Phytoplankton groups in different seasons in the study area. The phytoplankton groups related to the environmental variables are presented by squares while triangles represent seasons. (WD – Water depth, WT – water temperature, AT – air temperature, EC – electrical conductivity, Trans – transparency, FCO₂ – free carbon dioxide, DO-dissolved oxygen, BOD-biological oxygen demand, TA-total alkalinity, TH-Total Hardness, Ca⁺² – Calcium, Mg⁺² – Magnesium, Cl – chloride, NO₃ – nitrate, PO₄-phosphate , NH₃-N – Ammonia nitrogen and RF – rainfall).