Introduction
Wetlands cover approximately 4.6% of India's geographical area and encompass 101 designated Ramsar sites of international importance. Under Articles 48A and 51A(g) of the Indian Constitution, the preservation of these critical aquatic ecosystems is a constitutional mandate, governed nationally by the statutory Wetlands (Conservation and Management) Rules, 2017.
Major Ecological Functions of Wetlands
Wetlands serve as transitional ecotones between terrestrial and aquatic systems, delivering vital ecological stabilizing services:
- Carbon Sequestration: Wetlands function as highly efficient terrestrial carbon sinks, sequestering significant amounts of atmospheric carbon and mitigating climate change impacts.
- Central Asian Flyway Support: They provide critical wintering halts and foraging grounds for migratory avifauna across international migratory routes, such as Bihar's Kanwar Taal (Kabartal) and Gogabeel Lake.
- Hydrological Buffering and Aquifer Recharge: Operating as natural sponges, wetlands absorb flood peaks during excessive rainfall, regulate downstream flow, trap sediments, and replenish deep groundwater aquifers.
Major Economic Functions of Wetlands
Wetlands directly sustain millions of rural and riparian livelihoods through diverse provisioning and cultural services:
- Livelihood and Cultivation: Wetlands support major inland capture fisheries, aquaculture, and the commercial cultivation of high-value aquatic crops such as makhana (fox nuts) and water chestnut.
- State-Supported Blue Economy: Recognizing their productive value, state programs, such as those highlighted in the Bihar Economic Survey, provide a 50% to 70% subsidy to convert low-lying private waterlogged areas into productive aquaculture ponds.
- Tourism and Cultural Services: Prominent wetlands generate significant local revenue through birdwatching, eco-tourism, and traditional cultural and religious interactions.
Threats Faced by Wetlands in India
Despite their ecological and socio-economic importance, wetlands across India face severe degradation:
- Eutrophication and Pollution: Inflow of untreated industrial effluents, domestic sewage, and agricultural runoff laden with chemical fertilizers leads to nutrient overload, oxygen depletion (hypoxia), and invasive weed proliferation.
- Encroachment and Habitat Fragmentation: Unplanned urbanisation, land reclamation, infrastructural expansion, and siltation reduce wetland boundaries and break hydrological connectivity.
- Hydrological Alterations: Excessive drainage, unmanaged groundwater extraction, and upstream damming disrupt natural flood pulses and wetland water balances.
- Climate Stress: Shifting precipitation regimes and rising temperature anomalies induce desiccation and disrupt avian breeding cycles.
Conclusion
Securing the ecological health of wetlands requires adopting the Ramsar 'wise-use' principle by aligning conservation with sustainable community use. Strengthening institutional enforcement via State Wetland Authorities and involving local communities through models like the Gogabeel Community Reserve will be crucial for sustained ecological resilience.