The Biobrio 13(1 & 2), 2026

Evaluation of Zooplankton Community Integrity in Relation to Reservoir Ecosystem Health and Riparian Livelihood Sustainability in Jharkhand

Namat Nawaj, Madhumanti, Asha Mishra & Nupur Lal

ABSTRACT:

This study evaluates the relationship between zooplankton community integrity, reservoir ecosystem health, and riparian livelihood sustainability at Getalsud Dam, Ranchi (2024-2025). Seasonal sampling across pre-monsoon, monsoon, and post-monsoon periods revealed significant deterioration in zooplankton community integrity during monsoon (Integrity Score: 4.8/10), characterized by reduced diversity (Shannon Index: 1.87) and elevated Rotifer:Cladoceran ratio (18.5:1), indicating eutrophic stress from agricultural runoff. Water Quality Index concurrently declined from "Good" (72.4) to "Poor" (38.7) during monsoon, with elevated BOD (5.8 mg/L) and coliform levels (1850 MPN/100mL). Concurrent household surveys (n=240) across 12 riparian villages demonstrated highest fisheries dependency (68.5%) near inflow zones but paradoxically lowest income (4,850/month), while communities near the dam wall exhibited greater livelihood diversification (58.8%) and higher fisheries income (7,450/month). Significant correlations emerged between zooplankton integrity, water quality, and fisheries income (r > 0.64, p < 0.01), confirming tight socio-ecological coupling. Community perceptions of water quality decline significantly correlated with scientific measurements (r = -0.74, p < 0.001). Our findings demonstrate that zooplankton community integrity serves as a reliable bioindicator of reservoir ecosystem health, which directly influences riparian livelihood sustainability. Integrated management addressing both ecological integrity and community livelihood needs is essential for long-term sustainability of tropical reservoir ecosystems.

Keywords:    

Zooplankton community integrity, ecosystem health, livelihood sustainability, Getalsud Dam, bioindicators, socio-ecological systems.

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