Seasonal Variation in Primary Productivity in Relation to Physico-Chemical Parameters of Lower Tiger Hills Reservoirs, Nilgiris District, Tamil Nadu, India
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The present study investigated the variation in primary productivity in the Upper and Lower Tiger Hills Reservoirs located in Udhagamandalam. The relationship between primary productivity and selected physico-chemical parameters, including air temperature, water temperature, conductivity, and dissolved oxygen, was also evaluated. Water samples were collected from four stations in each reservoir at fortnightly intervals from November 2025 to April 2026. Primary productivity was estimated using the dark bottle method. The results revealed a significant relationship between primary productivity and the measured physico-chemical parameters. Both reservoirs exhibited comparatively high productivity, supporting the development and sustenance of plankton communities. The findings indicate that physico-chemical characteristics play an important role in regulating primary productivity and maintaining ecological balance in these freshwater ecosystems.
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