Rakhi, R., Babitha G.S. and Sheeba S.
Abstract
Water quality assessment is crucial for evaluating its sustainable use by dependent biota. The present study investigates physico-chemical parameters and primary productivity of the Anchuthengu-Akathumuri backwater (8° 39â to 8° 44âN latitude and 76° 45â to 76° 47âE longitude) located in southern Kerala from March to August 2022. Significant spatial and temporal fluctuations were observed in temperature, salinity, phosphate-phosphorus, nitrate-nitrogen, and nitrite-nitrogen. Dissolved CO2, alkalinity, BOD, DO, and pH levels remained within optimal ranges. Reduced transparency during monsoon months was attributed to turbidity and low solar radiation, accompanied by decreased salinity (0-5). Fluctuating levels of sulphate (10-25 mg/l), nitrate nitrogen (4-5 mg/l), nitrite nitrogen (0.1-0.2 mg/l), and phosphate (0.2-0.3 mg/l) were likely influenced by irregular monsoons and anthropogenic activities. Seasonal analysis of Gross Primary Productivity (GPP) and Net Primary Productivity (NPP) indicated significant variation among sampling stations. This study provides insights that can guide the implementation of mitigating measures to preserve the health of the backwater ecosystem.