Wetland Ecology: Ramsar Criteria, Ecosystem Services, and India’s Ramsar Sites
Wetlands are among the Earth’s most productive, biologically diverse, and ecologically critical ecosystems. Often described as “nature’s kidneys,” they purify water, buffer floods, recharge groundwater, store carbon, and support extraordinary biodiversity. The Ramsar Convention (1971) — the oldest multilateral environmental agreement focused on a single ecosystem type — provides the global framework for the designation, conservation, and wise use of wetlands of international importance. India, as a signatory since 1982, now hosts 100 Ramsar sites, the highest number in Asia.
A wetland qualifies for listing as a Ramsar Site (wetland of international importance) if it meets at least one of nine Ramsar criteria, which span biodiversity representation, threatened species support, and waterbird or fish populations. Wetlands provide an extensive array of ecosystem services — provisioning, regulating, supporting, and cultural. India’s 100 Ramsar sites span diverse wetland types across all biogeographic zones. However, many are threatened by agricultural encroachment, pollution, urbanisation, and invasive species. Two Indian sites — Keoladeo National Park (Rajasthan) and Loktak Lake (Manipur) — are on the Montreux Record of Ramsar sites facing ecological threat. The Wetlands (Conservation and Management) Rules 2017 govern domestic wetland protection.
📌 Revision Pointers
Ramsar Convention: Signed 2 February 1971 in Ramsar, Iran; entered into force December 1975
India signed: 1 February 1982; first Ramsar Sites: Chilika Lake (Odisha) and Keoladeo Ghana (Rajasthan)
India’s total Ramsar sites: 100 (2026); highest in Asia; third globally after UK and Mexico
9 Ramsar Criteria: Criteria 1–3 (biodiversity/ecosystem), 4–6 (waterbirds), 7–9 (fish)
A wetland qualifies if it meets AT LEAST ONE criterion
Montreux Record: Indian entries — Keoladeo National Park + Loktak Lake; Chilika was listed and later removed
Wise Use Principle: Sustainable use compatible with maintaining ecological character
World Wetlands Day: 2 February each year
Wetlands (Conservation and Management) Rules 2017 notified under the Environment Protection Act 1986
National Wetland Inventory and Assessment (NWIA): SAC-ISRO mapped over 200,000 wetlands across India
Definition of Wetlands
The Ramsar Convention defines wetlands broadly as “areas of marsh, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt, including areas of marine water the depth of which at low tide does not exceed six metres.” This encompassing definition includes mangroves, coral reefs, estuaries, rivers, ox-bow lakes, freshwater marshes, peatlands, rice paddies, fish ponds, reservoirs, and salt pans.
Types of Wetlands
Marine and coastal wetlands: Coral reefs, mangroves, seagrass beds, estuaries, tidal flats, coastal lagoons, and rocky shores.
Inland wetlands: Rivers and streams, lakes and ponds, peatlands, freshwater marshes, swamps, ox-bow lakes, and seasonal floodplains.
Human-made wetlands: Reservoirs, aquaculture ponds, salt pans, rice paddies, constructed wetlands for sewage treatment, and irrigation canals.
Ramsar Criteria for Designation
A wetland is designated a Ramsar Site if it meets at least one of the following nine internationally agreed criteria:
Criteria 1–3 (Representative, Special, or Unique Wetland Types): Criterion 1 — contains a representative, rare, or unique wetland type; Criterion 2 — supports vulnerable, endangered, or critically endangered species, or threatened ecological communities; Criterion 3 — supports populations of plant or animal species important for maintaining the biological diversity of a particular biogeographic region.
Criteria 4–6 (Waterbird Criteria): Criterion 4 — supports plant or animal species at a critical stage of their life cycle, or provides refuge during adverse conditions (e.g., drought); Criterion 5 — regularly supports 20,000 or more waterbirds; Criterion 6 — regularly supports 1% or more of the individuals in a population of one species or subspecies of waterbird.
Criteria 7–9 (Fish Criteria): Criterion 7 — supports a significant proportion of indigenous fish subspecies, species, or families, life history stages, or interactions that are representative of wetland benefits; Criterion 8 — an important source of food for fishes, spawning ground, nursery or migration path; Criterion 9 — regularly supports 1% of the individuals in a population of one species or subspecies of wetland-dependent non-avian animal species.
Ecosystem Services of Wetlands
Provisioning services: Supply of freshwater, fish and shellfish, plant materials, medicinal plants, peat (as fuel or substrate), and genetic resources.
Regulating services: Flood attenuation and flow regulation, water purification and pollutant filtration, groundwater recharge and discharge, coastline and riverbank stabilisation, storm protection, and carbon sequestration (particularly in peatlands and mangroves).
Supporting services: Primary production, nutrient cycling (nitrogen, phosphorus), sediment stabilisation, and provision of habitat for biodiversity including migratory species.
Cultural services: Ecotourism and recreation, aesthetic and spiritual values, cultural heritage, and scientific research and education.
The Wise Use Principle
The “wise use” concept is the philosophical cornerstone of the Ramsar Convention. Defined as “the maintenance of ecological character, achieved through the implementation of ecosystem approaches, within the context of sustainable development,” it explicitly allows for sustainable human use of wetlands — including fishing, agriculture, and recreation — provided that the fundamental ecological character of the wetland is not compromised. Wise use is therefore neither strict preservation nor unregulated exploitation.
Important Concepts / Subtopics
Ecological Character
A technical Ramsar term defined as “the combination of the ecosystem components, processes and services that characterise the wetland at a given point in time.” The Convention requires parties to maintain the ecological character of Ramsar sites and to report any change or likely change (known as a “change in ecological character” trigger for Montreux Record listing).
Montreux Record
A register of Ramsar sites on the List of Wetlands of International Importance where changes in ecological character have occurred, are occurring, or are likely to occur as a result of technological developments, pollution, or other human interference. Parties can request listing with consent. India’s entries: Keoladeo National Park (water scarcity due to diversion of the Gambhir river’s inflow) and Loktak Lake (siltation, human settlements on phumdi islands, overfishing). Chilika Lake was listed in 1993 and removed in 2002 following successful ecological restoration.
India’s Notable Ramsar Sites
Chilika Lake (Odisha): Asia’s largest coastal lagoon; habitat for Irrawaddy dolphins, migratory birds; India’s first Ramsar site along with Keoladeo. Restored by the Chilika Development Authority through hydrological interventions.
Keoladeo National Park (Rajasthan): A UNESCO World Heritage Site; critical refuge for migratory waterfowl including the Siberian crane; faces water scarcity due to reduced inflows from the Gambhir river.
Loktak Lake (Manipur): Largest freshwater lake in northeast India; unique floating phumdi (heterogeneous mass of vegetation, soil, and organic matter) islands; habitat of the endangered Sangai (brow-antlered deer).
Wular Lake (Jammu and Kashmir): Largest freshwater lake in India; threatened by siltation and willow plantation encroachment.
Sundarbans (West Bengal): World’s largest mangrove delta; shared with Bangladesh; Tiger Reserve; UNESCO World Heritage Site; highly vulnerable to sea-level rise.
Harike Wetland (Punjab): Important waterbird habitat at the confluence of Beas and Sutlej rivers on the Central Asian Flyway; faces pollution from agricultural runoff.
Deepor Beel (Assam): Only Ramsar site near Guwahati; threatened by urban encroachment and solid waste dumping from the Boragaon landfill.
Point Calimere (Tamil Nadu): Important wintering area for flamingos and waterfowl; threatened by salt pan expansion and land use change.
Wetlands Conservation and Management Rules 2017
Notified under the Environment Protection Act (EPA) 1986, these rules replaced the Wetlands (Conservation and Management) Rules 2010. Key features: (a) shift of regulatory authority from the central government to state-level Wetland Authorities; (b) prohibition on draining, reclamation, dumping of solid waste, and setting up industries within notified wetlands; (c) requirement for states to develop a “zone of influence” management plan; (d) provision for a Central Wetland Regulatory Authority (CWRA) though its effective operationalisation remains a concern.
National Wetland Inventory and Assessment (NWIA)
Conducted by the Space Applications Centre (SAC) of ISRO, the NWIA mapped over 200,000 wetlands across India using satellite data at 1:50,000 scale. It provides baseline data on wetland area, type, and status — essential for planning, monitoring, and reporting under the Ramsar Convention.
Central Asian Flyway
A major migratory route used by millions of birds to travel between breeding grounds in Siberia and Central Asia and wintering areas in South and Southeast Asia. India’s wetlands — particularly in Gujarat, Rajasthan, Punjab, and the northeast — serve as critical staging posts along this flyway. Ramsar sites on the flyway are essential for the survival of threatened species like the Siberian crane and bar-headed goose.
Ramsar Site vs Protected Area
A Ramsar site designation is an international listing under the Ramsar Convention; it does not automatically confer the legal protection accorded to a Protected Area (National Park, Wildlife Sanctuary) under the Wildlife Protection Act 1972. Many Ramsar sites in India are also Protected Areas, but the two designations serve different purposes — Ramsar focuses on wise use and ecological character, while the WPA focuses on wildlife protection with stricter land-use restrictions.
Current Relevance
India rapidly expanded its Ramsar site count — adding 75 sites between 2014 and 2022 alone — as part of its environmental diplomacy and commitments under the Kunming-Montreal GBF (Target 2: restore 30% of degraded ecosystems). This also aligns with SDG 6 (clean water) and SDG 15 (life on land).
The National Green Tribunal (NGT) has repeatedly intervened to protect urban wetlands such as Pallikaranai marsh (Chennai) from solid waste dumping and encroachment, reflecting the gap between designation and effective protection on the ground.
Peatlands, a sub-type of wetland, store about twice the carbon of all the world’s forests, making their conservation a critical climate action. India’s high-altitude peat bogs in Himachal Pradesh and Uttarakhand remain underprotected.
The Wetlands Rules 2017’s devolution to state-level authorities has created inconsistency in wetland governance across states, with some states actively protecting wetlands and others yet to constitute Wetland Authorities.
💭 Conclusion
Wetlands occupy a unique position at the intersection of water security, biodiversity conservation, climate resilience, and rural livelihoods. India’s growing Ramsar site count signals intent, but the real challenge lies in translating designation into effective on-ground protection. Strengthening the Wetlands Rules 2017, operationalising state Wetland Authorities, integrating the NWIA into district-level land-use planning, and ensuring community participation in wetland governance are essential for India to fulfil both its Ramsar commitments and its obligations under the Kunming-Montreal Global Biodiversity Framework.