Visitors Count : 1812

  • 10 more wetlands in India declared as Ramsar sites India has added 10 more wetlands to sites protected by the Ramsar Convention, Union Environment Minister Prakash Javadekar announced on Tuesday.
    The 10 new ones are Nandur Madhameshwar, a first for Maharashtra; Keshopur-Miani, Beas Conservation Reserve and Nangal in Punjab; and Nawabganj, Parvati Agra, Saman, Samaspur, Sandi and Sarsai Nawar in Uttar Pradesh. The other Ramsar sites are in Rajasthan, Kerala, Odisha, Madhya Pradesh, Himachal Pradesh, Assam, West Bengal, Jammu and Kashmir, Andhra Pradesh, Manipur, Gujarat, Tamil Nadu and Tripura.
    With this, a total of 37 sites in the country have been recognised under the international treaty. Wetlands declared as Ramsar sites are protected under strict guidelines.
    World Wetlands Day is celebrated annually on Feb 2nd, marking the day of the adoption of the Convention on Wetlands on Feb 2nd 1971, to raise awareness about the value of Wetlands. Every year a dedicated theme is selected to focus attention and help raise public awareness about the value of wetlands. The theme for this year World Wetlands Day is "Wetlands and Biodiversity.”
    This year, Tamil Nadu State Wetland Authority along with Conservation Authority of Pallikaranai Marshland is celebrating the State level function by organizing various activities like panel discussions, cultural programmes, exhibitions/ painting competitions/ Quiz contests at different levels in which experts, students, stakeholders, policy planners etc., will be involved. Students under different category (Schools/ Colleges) and stakeholders will be encouraged to participate in essay, slogan, painting, quiz, Photography competitions on wetland themes and prizes will be distributed. This is been done to sensitize the stakeholders and communities at the grass root level in the vicinity of wetlands and to sensitize people about values and functions of wetlands and need for their conservation in a sustainable manner

A Wetland is a distinct ecosystem where the land is covered by water, either salt or fresh or somewhere inbetween. It exists all around the world from polar to tropical region and high altitudes to dry regions.Wetlands are the ecotones or transitional zones between permanently aquatic and dry terrestrial ecosystems. Ramsar Convention has defined wetlands 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 meters”. A wide variety of wetlands like marshes, swamps, open water bodies, mangroves and tidal flats and salt marshes etc. exist in our country.

Wetlands are areas where water is the primary factor controlling the environment and the associated plant and animal life.Wetlands are integral to a healthy environment. They help to retain water during dry periods, thus keeping the water table high and relatively stable. At the time of flood, they act to reduce flood levels and to trap suspended solids and nutrients to the lakes than if they flow directly into the lakes. Compared to tropical rain forests and coral reefs, wetlands are remarkable in their biological productivity. With respect to species richness and species diversity, these ecosystems stand higher than most other ecosystems. Wetlands are diverse and unique in structure, characteristics and functions, probably much more than other ecosystems. Wetlands are dynamic and complex and are under the influence of an array of biotic and abiotic factors. The most significant factor that determines the nature of a wetland is its hydrologic regime. Even for minor changes in the hydrologic regime of wetlands, biota may respond at times markedly in terms of species composition, richness, trophic relations and ecosystem productivity.

Wetland Types

The wetlands show several characteristic features that are determined by the combination of salinity of the water, soil types and flora and fauna in that habitat. The wetlands are categorized into different types.

• Marine (coastal wetlands including coastal lagoons, rocky shores, and coral reefs)
• Estuarine (including deltas, tidal marshes, and mangrove swamps)
• Lacustrine (wetlands associated with lakes)
• Riverine (wetlands along rivers and streams) and
• Palustrine (meaning “marshy” - marshes, swamps and bogs)

In addition, there are human-made wetlands such as fish and shrimp ponds, farm ponds, irrigated agricultural lands, salt pans, reservoirs, gravel pits, sewage farms and canals. The Ramsar Convention has adopted a Ramsar Classification of Wetland Types which include 42 types, grouped into three categories: Marine and Coastal Wetlands, Inland Wetlands, and Human-made Wetlands.

Wetland values

Wetlands provide tremendous economic benefits, for example water supply (quantity and quality); fisheries (over two thirds of the world’s fish harvest is linked to the health of coastal and inland wetland areas);agriculture, through the maintenance of water tables and nutrient retention in floodplains, energy resources, such as peat and plant matter, wildlife resources, transport, recreation and tourism opportunities.
In addition, wetlands have special attributes as part of the cultural heritage of humanity. They are related to religious and cosmological beliefs, constitute a source of aesthetic inspiration, provide wildlife sanctuaries, and form the basis of important local traditions.

These functions, values and attributes can only be maintained if the ecological processes of wetlands are allowed to continue functioning. Unfortunately and in spite of important progress made in recent decades, wetlands continue to be among the world’s most threatened ecosystems, owing mainly to the ongoing drainage, conversion, pollution, and over-exploitation of their resources.

Ecosystem services provided by wetlands

Depending partly on wetland’s geographic and topographic location, the functions it performs can support multiple ecosystem services, values,and benefits. Wetlands provide ecosystem services like

  • Water storage (flood control)
  • Groundwater replenishment
  • Shoreline stabilization and storm protection (erosion control)
  • Water purification
  • Reservoirs of biodiversity
  • Pollination
  • Wetland products
  • Cultural values
  • Recreation and tourism
  • Climate change mitigation and adaptation

Need for conserving Wetlands

The economic worth of the ecosystem services provided to society by intact, naturally functioning wetlands is frequently much greater than the perceived benefits of converting them to 'more valuable' intensive land use. To replace these wetland ecosystem services, enormous amounts of money would need to be spent on water purification plants, dams, levees, and other hard infrastructure, and many of the services are impossible to replace.

Threats to wetlands

In India, momentous losses of wetlands have resulted from conversion to industrial, agricultural and various other developments. These have caused hydrological perturbations and its various reverberations, pollution and several other effects. The threats can also be distinguished under biotic and abiotic components.

Biotic Threats

• Uncontrolled Siltation And Weed Infestation.
• Uncontrolled discharge of Waste Water, Industrial Effluents, Surface Run-Off Etc. Resulting In proliferation of aquatic weeds and eutrophication, which adversely affect the Flora And Fauna
• Tree felling for fuel wood and wood products causing soil loss affecting rainfall pattern.
• Loss of various aquatic species due to water level fluctuation.
• Habitat destruction leading to loss of fish and decrease in number of Migratory birds.

Abiotic Threats

• Encroachment resulting in shrinkage of area.
• Anthropogenic pressures resulting in habitat destruction and loss of biodiversity.
• Uncontrolled dredging resulting in changes.
• Hydrological intervention resulting in Loss of aquifers.

Wetlands and Climate Change

Wetlands play a key role in buffering the effects of climate change, thereby supporting climate adaptation and resiliency (Millennium Ecosystem Assessment 2005). Indeed, vegetated and healthy wetlands are among the most effective sinks for carbon on the planet. However, this potential is under appreciated in current policy discussions. The carbon sequestration capacity of wetlands is highly variable among different ecosystems, as is their hydrology and productivity. However, among these, seagrass beds (Blue carbon) are known to be very important carbon sinks.

Wetlands are among the ecosystems that are most strongly impacted by even small changes in climate and resulting changes in hydrological regimes, in particular through sea level rise and decreased surface and ground water levels.

Healthy wetlands support Mitigation and Adaptation to climate change

Wetlands sequester some of the largest stores of carbon on the planet, but when disturbed or warmed, they release the three major heat-trapping greenhouse gases carbon dioxide, methane, and nitrous oxide. Protecting wetlands from human disturbance helps to limit the increase in greenhouse gases in the atmosphere. Wetland networks also are key corridors and stepping stones allowing species to move to cooler areas and thus adapt to rising temperatures.