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79-461: The East Kolkata Wetlands (officially known as East Calcutta Wetlands ) (22 0 27’ N 88 0 27’ E), are a complex of natural and human-made wetlands lying east of the city of Calcutta (Kolkata), of West Bengal in India . The wetlands cover 125 square kilometres and include salt marshes, and agricultural fields, sewage farms and settling ponds. The wetlands are also used to treat Kolkata's sewage, and

158-711: A sink or a source of carbon, depending on the specific wetland. If they function as a carbon sink, they can help with climate change mitigation . However, wetlands can also be a significant source of methane emissions due to anaerobic decomposition of soaked detritus , and some are also emitters of nitrous oxide . Humans are disturbing and damaging wetlands in many ways, including oil and gas extraction , building infrastructure, overgrazing of livestock , overfishing , alteration of wetlands including dredging and draining, nutrient pollution , and water pollution . Wetlands are more threatened by environmental degradation than any other ecosystem on Earth, according to

237-521: A buffer between land and water to minimise erosion. The area is also home to large numbers of coconut and betel nut trees. Many varieties of vegetables are farmed here, including cauliflower, eggplant, pumpkin, sunflower and sacred basil. Tracts of land are dedicated to paddy cultivation as well. Numerous species of fish are farmed in the sewage-fed ponds called bheris in the East Kolkata wetlands. These include silver carp and tilapia . The area

316-564: A case study from Calcutta (India)', International Journal of Environmental Studies. Deb, S. C., Das, K. K., and Santra, S. C. (1996). 'Studies on the productivity of sewage-fed ecosystem', Journal of Environmental Protection, 12. DEC a (1945). 'History of the Gangetic Delta, Appendix 1 a', Report of the committee to inquire into the drainage conditions of Calcutta and adjoining area, Drainage Enquiry Committee, Government of Bengalk, Calcutta, India. ____b (1945). 'Draionage (rural) of

395-402: A frequency and duration to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally included swamps, marshes, bogs, and similar areas.' For each of these definitions and others, regardless of the purpose, hydrology is emphasized (shallow waters, water-logged soils). The soil characteristics and

474-503: A length of more than 0.75 metres ( 2 + 1 ⁄ 2 feet) and are up to 7.5 cm (3 in) thick. Inflorescences are typically shorter than the leaves and decumbent. Flowers are in whorls or pairs at nodes and have a diameter of two to three centimeters. They have three petals , each of which is white with a striking wine-colored stain, and three green sepals . The thick pedicels are as long as 5 cm (2 in). Flowering occurs from June to September. S. montevidensis

553-588: A phrase used by the Court for legal gamesmanship. Over the years, these wetlands have faced continuing threats and encroachment. In many instances, the original petitioner, PUBLIC, has had to go to court (High Court, Supreme Court, the National Green Tribunal) to argue on the basis of the 1992 judgment and the later EKW Act to ward off project proposals that were in fact disguised attempts at land-grabbing. While minor encroachments continue even today,

632-1259: A polar climate, wetland temperatures can be as low as −50 °C (−58 °F). Peatlands in arctic and subarctic regions insulate the permafrost , thus delaying or preventing its thawing during summer, as well as inducing its formation. The amount of precipitation a wetland receives varies widely according to its area. Wetlands in Wales , Scotland , and western Ireland typically receive about 1,500 mm (59 in) per year. In some places in Southeast Asia , where heavy rains occur, they can receive up to 10,000 mm (390 in). In some drier regions, wetlands exist where as little as 180 mm (7.1 in) precipitation occurs each year. Temporal variation: Surface flow may occur in some segments, with subsurface flow in other segments. Wetlands vary widely due to local and regional differences in topography , hydrology , vegetation , and other factors, including human involvement. Other important factors include fertility, natural disturbance, competition, herbivory , burial and salinity. When peat accumulates, bogs and fens arise. The most important factor producing wetlands

711-540: A portion of the overall water cycle, which also includes atmospheric water (precipitation) and groundwater . Many wetlands are directly linked to groundwater and they can be a crucial regulator of both the quantity and quality of water found below the ground. Wetlands that have permeable substrates like limestone or occur in areas with highly variable and fluctuating water tables have especially important roles in groundwater replenishment or water recharge. Substrates that are porous allow water to filter down through

790-416: A protective barrier to coastal shoreline. Mangroves stabilize the coastal zone from the interior and will migrate with the shoreline to remain adjacent to the boundary of the water. The main conservation benefit these systems have against storms and storm surges is the ability to reduce the speed and height of waves and floodwaters. Sagittaria montevidensis See text Sagittaria montevidensis

869-468: A spill basin, and the fragility of the ecosystem." The outcome was that the proposal for the World Trade Centre was turned down in its original form and strict conditions were laid: "I do not find any justiciable reason to disagree with the opinion expressed by the environmentalists that wetland should be preserved and no interference or reclamation should be permitted." Following the order of

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948-422: A strong influence on wetland water chemistry, particularly in coastal wetlands and in arid and semiarid regions with large precipitation deficits. Natural salinity is regulated by interactions between ground and surface water, which may be influenced by human activity. Carbon is the major nutrient cycled within wetlands. Most nutrients, such as sulfur , phosphorus , carbon , and nitrogen are found within

1027-410: A unique kind of wetland where lush plant growth and slow decay of dead plants (under anoxic conditions) results in organic peat accumulating; bogs, fens, and mires are different names for peatlands. Variations of names for wetland systems: Some wetlands have localized names unique to a region such as the prairie potholes of North America's northern plain, pocosins , Carolina bays and baygalls of

1106-515: A wetland is "an ecosystem that arises when inundation by water produces soils dominated by anaerobic and aerobic processes, which, in turn, forces the biota, particularly rooted plants, to adapt to flooding". Sometimes a precise legal definition of a wetland is required. The definition used for regulation by the United States government is: 'The term "wetlands" means those areas that are inundated or saturated by surface or ground water at

1185-422: A wetland system includes its plants ( flora ) and animals ( fauna ) and microbes (bacteria, fungi). The most important factor is the wetland's duration of flooding. Other important factors include fertility and salinity of the water or soils. The chemistry of water flowing into wetlands depends on the source of water, the geological material that it flows through and the nutrients discharged from organic matter in

1264-403: A wetland) affects hydro-periods (temporal fluctuations in water levels) by controlling the water balance and water storage within a wetland. Landscape characteristics control wetland hydrology and water chemistry. The O 2 and CO 2 concentrations of water depend upon temperature , atmospheric pressure and mixing with the air (from winds or water flows). Water chemistry within wetlands

1343-558: A whole. 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. Floodplains and closed-depression wetlands can provide the functions of storage reservoirs and flood protection. The wetland system of floodplains is formed from major rivers downstream from their headwaters . "The floodplains of major rivers act as natural storage reservoirs, enabling excess water to spread out over

1422-594: A wide area, which reduces its depth and speed. Wetlands close to the headwaters of streams and rivers can slow down rainwater runoff and spring snowmelt so that it does not run straight off the land into water courses. This can help prevent sudden, damaging floods downstream." Notable river systems that produce wide floodplains include the Nile River , the Niger river inland delta, the Zambezi River flood plain,

1501-407: Is a robust example of potential carbon sink and spin-off. EKW can sequester ~1.9 Mg C/ha/year, mitigating at least ~118 Gg atmospheric CO 2 /year. Plus, carbon uptake by harvested fish crop corresponds to ~61 Gg CO 2 /year - rewarding US$ 3.6/kg blue C harvested. The East Kolkata Wetlands (Conservation and Management) Act, 2006 represents an important landmark as it paved way for establishment of

1580-496: Is a species of flowering plant in the water-plantain family Alismataceae . Common names include giant arrowhead and California arrowhead . Sagittaria montevidensis is a robust, stemless, rhizomatous , aquatic plant . The young ribbon-like leaves grow submerged, while the leaves of older plants emerge above the water surface. The leaves are sagitatte and glabrous, up to 28 centimetres (11 inches) long and 23 cm (9 in) wide. Its terete, spongy petioles may reach

1659-550: Is also home to the marsh mongoose and small Indian mongoose . Palm civet and small Indian civet are significant in and around East Calcutta Wetlands. Approximately 20 mammals are reported from this region. Snakes found in the East Calcutta Wetland include the checkered keelback ( Fowlea piscator ), smooth water snake ( Enhydris enhydris ), buff striped keelback ( Amphiesma stolata ) and Common bronzeback or Daudin's bronzeback ( Dendrelaphis tristis ). It

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1738-440: Is determined by the pH , salinity , nutrients, conductivity , soil composition, hardness , and the sources of water. Water chemistry varies across landscapes and climatic regions. Wetlands are generally minerotrophic (waters contain dissolved materials from soils) with the exception of ombrotrophic bogs that are fed only by water from precipitation. Because bogs receive most of their water from precipitation and humidity from

1817-633: Is either freshwater , brackish or saltwater . The main types of wetland are defined based on the dominant plants and the source of the water. For example, marshes are wetlands dominated by emergent herbaceous vegetation such as reeds , cattails and sedges . Swamps are dominated by woody vegetation such as trees and shrubs (although reed swamps in Europe are dominated by reeds, not trees). Mangrove forest are wetlands with mangroves , halophytic woody plants that have evolved to tolerate salty water . Examples of wetlands classified by

1896-412: Is hydrology, or flooding . The duration of flooding or prolonged soil saturation by groundwater determines whether the resulting wetland has aquatic, marsh or swamp vegetation . Other important factors include soil fertility, natural disturbance, competition, herbivory , burial, and salinity. When peat from dead plants accumulates, bogs and fens develop. Wetland hydrology is associated with

1975-451: Is the only place in the world where both crocodiles and alligators coexist. The saltwater crocodile inhabits estuaries and mangroves. Snapping turtles also inhabit wetlands. Birds , particularly waterfowl and waders use wetlands extensively. Mammals of wetlands include numerous small and medium-sized species such as voles , bats , muskrats and platypus in addition to large herbivorous and apex predator species such as

2054-466: Is the type locality of a mammalian species called the Salt Lake marsh mongoose . Over 40 species of birds can be spotted at the wetlands. The process of urbanisation however, is leading to the disappearance of many bird species from the area. (Ghosh,A,K, 2004) Kolkata is an example of how natural wetlands are sometimes being utilised in developing countries. Using the purification capacity of wetlands,

2133-545: Is usually saturated with water". More precisely, wetlands are areas where "water covers the soil , or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season". A patch of land that develops pools of water after a rain storm would not necessarily be considered a "wetland", even though the land is wet. Wetlands have unique characteristics: they are generally distinguished from other water bodies or landforms based on their water level and on

2212-621: Is why out of 25000 encroachment in EKW, the NGO PUBLIC has targeted only few. These allegations are typical of the slander that successful and sincere NGOs are subjected to. The fact is that PUBLIC has been selective in targeting violators so that they are made examples for real estate sharks and their cronies - therefore Srisri Ravishankar's so-called Temple of Knowledge, which was fined by the Calcutta High Court for "forum shopping",

2291-519: Is widespread in wetlands of North America ( United States , Canada , Mexico ) and South America ( Brazil , Bolivia , Ecuador , Peru , Argentina , Chile , Paraguay , Uruguay ). In North America, the distribution is disjunct, primarily in a wide area from West Virginia to Texas to South Dakota , but with isolated occurrences in New Brunswick , Maine , Connecticut , New York , New Jersey , California , Florida and Alabama It

2370-505: The Millennium Ecosystem Assessment from 2005. Methods exist for assessing wetland ecological health . These methods have contributed to wetland conservation by raising public awareness of the functions that wetlands can provide. Since 1971, work under an international treaty seeks to identify and protect " wetlands of international importance ." A simplified definition of wetland is "an area of land that

2449-688: The Pantanal in South America, and the Sundarbans in the Ganges - Brahmaputra delta. Wetlands contribute many ecosystem services that benefit people. These include for example water purification , stabilization of shorelines, storm protection and flood control . In addition, wetlands also process and condense carbon (in processes called carbon fixation and sequestration ), and other nutrients and water pollutants . Wetlands can act as

East Kolkata Wetlands - Misplaced Pages Continue

2528-444: The atmosphere , their water usually has low mineral ionic composition. In contrast, wetlands fed by groundwater or tides have a higher concentration of dissolved nutrients and minerals. Fen peatlands receive water both from precipitation and ground water in varying amounts so their water chemistry ranges from acidic with low levels of dissolved minerals to alkaline with high accumulation of calcium and magnesium . Salinity has

2607-576: The beavers , coypu , swamp rabbit , Florida panther , jaguar , and moose . Wetlands attract many mammals due to abundant seeds, berries, and other vegetation as food for herbivores, as well as abundant populations of invertebrates, small reptiles and amphibians as prey for predators. Invertebrates of wetlands include aquatic insects such as dragonflies , aquatic bugs and beetles , midges, mosquitos , crustaceans such as crabs, crayfish, shrimps, microcrustaceans, mollusks like clams, mussels, snails and worms. Invertebrates comprise more than half of

2686-803: The Calcutta High Court in 1992,to its credit, the State Government did not appeal but accepted the ruling. In fact, the Environment Secretary, Kalyan Biswas, applied for the East Calcutta Wetlands to be designated a "wetland of international importance" under the Ramsar Convention . This was obtained in 2002. Finally, in 2006, as a reflection of state and civil society partnership, the East Kolkata Wetlands (Management & Conservation) Act

2765-476: The Cooperative has turned the area into a thriving fish farm and nature park. Recently illegal landfills are on the rise and the wetlands are being slowly assimilated in the stream city. This unprecedented land development and urbanisation are creating concerns about the impact on the environment. Wetlands are under threat due to exponential expansion of real-estate projects in eastern Kolkata especially in

2844-829: The Corporation of Calcutta, Central Municipal Office, Calcutta, India, 81(6&7). CMW&SA (1996). Sustaining Calcutta, Present Status Report of the Urban People's Environment, Calcutta Metropolitan Water and Sanitation Authority, Kolkata. ____ (1997). Base line document for management action plan, East Calcutta Wetlands and Waste Recycling Region, Calcutta Metropolitan Water and Sanitation Authority, Kolkata. Cook, C.D.K. (1996). Aquatic and Wetlands Plants of India. Oxford University Press. Costanza, R., d'Agre, R.,m Groot, R. de, Farber, S., Grasso, M., Hannon, B., Limbujrg, K., Naeem, S.O., Neill, R. V., Paruelo, J., Raskin, R. G., Sutton P., and Belt, M. van den (1997).'The Value of

2923-1679: The Department of Environment, Government of West Bengal. ____ (2001). Report of the committee to look into all aspects of the existing and permissible land uses in the East Kolkata Wetland Area, Department of Environment, Government of West Bengal. _____ (2004)Report of the committee for formulation of the guidelines for preparation of management plan of East Kolkata Wetland, Department of Environment, Government of West Bengal. Department of Fisheries (1983). Report on study of heavy metal in sewage-fed fisheries, Department of Fisheries, Government of West Bengal. Douglas, J. S. (1972). Beginner's guide to applied ecology, Pelham Books, London. Ekins, P. (1972). Beginner's guide to applied ecology, Pelham Books, London. Ekins, P. (1992). A New World Order, Grassroot Movement for global change, Routledge, London. Farber, S., and Costanza, R. (1987). 'The economic value of wetland systems', Journal of Environmental Management, 24. Ghosh,A.K(.1990 ). Biological Resources of East Calcutta Wetlands. Indian J Landscape System and Ecological Studies,13 (1):10 - 23 Ghosh,A.K and Chakrabarty, Satyesh(1997). Management of East Calcutta Wetlands and Canal Systems. A Report, CEMSAP,Dept.Environment Govt. West Bengal, 1–188. Ghosh,A.K. and Shreela Chakrabarti (1999).Human Interventions and Changing Status. Sci. Cult., 65:36 -38. Ghosh,A.K.(2004). Avian Diversity of East Calcutta Wetlands. Environ,9 (1):8 - 13. Ghosh, S. K., and Ghosh, D. (2003). Rehabilitating Biodiversity: A community-based initiatives in

3002-997: The East Calcutta Wetlands by Gautam Gupta, Jadavpur University (see: www.iwmi.cgiar.org/ ... /Urban%20Wastewater%20WS_Kolkata.pdf ). 2. S.Ray Choudhury, A. R. Thakur. Microbial Genetic Resource Mapping of East Kolkata Wetland. Current Science, Vol. 91, No. 2, 2006 25 July. 3. Ghosh, A., Maity, B., Chakrabarti, K., Chattopadhyay, D. (2007). Bacterial diversity of East Calcutta Wet land area: possible identification of potential bacterial population for different biotechnological uses. Microb Ecol. Oct;54(3):452-9. Maiti, P and Banerjee, S. (1999). Heavy metal in wastewater ponds in and around Calcutta and their effect on Mammalian System contaminated through fish raised in wastewater improvement, Annual report (1998–1999), Department of Zoology, University of Calcutta. Barbier, E.B., Acreman, M., and Knowler, D. (1997). Economic valuation of wetlands - A guide for policy makers and planners, Ramsar Copnvention Bureau, Gland, Switzerland. Biswas, K. P. (1927). 'Flora of

3081-558: The East Calcutta Wetlands, A Communiqué published through WWF-India (W.B.S.O.), in collaboration with British Council Division, Kolkata. Ghosh, D., and Furedy, C. (1984). 'Resource Conserving Traditions and Waste Disposal: The Garbage Farms and Sewage-fed Fisheries of Calcutta', Conservation and Recycling, Vol. 7, No. 2-4. Ghosh, D., and Sen, S. (1987). 'Ecological History of Calcutta's Wetland Conservation', Environmental Conservation, vol. 14(3). Wetland Wetlands exist on every continent , except Antarctica . The water in wetlands

3160-713: The East Kolkata Wetlands Management Authority (EKWMA) for conservation and management of the EKW. The EKWMA is constituted under Section 3 of the Act, 2006. In 2017 Section 3(2) of the Act, 2006 has been amended and the composition of the EKWMA has been changed. The EKWMA is a thirteen (13) member body with the Chief Secretary, Government of West Bengal, Secretaries of different Departments of State Govt. as well as four experts nominated by

3239-478: The East Kolkata Wetlands still survive. Conservation Methods: 1. To demarcate the boundaries of the East Kolkata wetlands on the field. 2. To take measures or make an order to stop, undo and prevent any unauthorised development project in, or unauthorised use of, or unauthorised act on, the East Kolkata wetlands. 3. To make an order directing demolition or alteration of any hoarding, frame, post, kiosk, structure, neon-signed or sky-sign, erected or exhibited illegally for

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3318-474: The East Kolkata wetlands. 11. To enforce land use control in the substantially water body-oriented areas and other areas in the East Kolkata wetlands. 12. To detect changes of ecological character and in land use in the East Kolkata wetlands. 13. To establish network with other Ramsar Sites in India. 14. To conduct inquiry or scientific study within the scope of this project. 15. To constitute expert committee within

3397-500: The Indian city of Kolkata has pioneered a system of sewage disposal. Originally built to house one million (10 lakh) people, Kolkata is now home to over 10 million (over 1 crore) people, with nearly one-third of them living in slums. But the 8,000-hectare East Kolkata Wetlands Ramsar Site, a patchwork of tree-fringed canals, vegetable plots, rice paddies and fish ponds – and the 20,000 people that work in them – daily transform one-third of

3476-639: The Okavango River inland delta, the Kafue River flood plain, the Lake Bangweulu flood plain (Africa), Mississippi River (US), Amazon River (South America), Yangtze River (China), Danube River (Central Europe) and Murray-Darling River (Australia). Groundwater replenishment can be achieved for example by marsh , swamp , and subterranean karst and cave hydrological systems. The surface water visibly seen in wetlands only represents

3555-500: The Salt Lake and Rajarhat sectors. Nowadays, land encroachment and land alteration are the important aspect of threats for East Kolkata Wetland (EKW). Transformation from wetland to fishing pond, i.e., aquaculture field are become a potential threat to EKW (Ghosh et al. 2018). Microbial Diversity is an integral part of biodiversity which includes bacteria, archaea, fungi, algae, protozoa and protists (Ghosh, A., 2007). East Kolkata Wetland shows an immense diversity of flora and fauna both at

3634-671: The Salt Lakes, Calcutta', Journal of Department of Science, University of Calcutta, vol. 8. Bose, B.C. (1944). 'Calcutta sewage-fisheries culture', Proc. Natl. Inst. Sci. India, 10. Brown, L. R. (2001). Eco-Economy-Building an Economy for the Earth, Earthscan, London. Chakraborty, S. (1970). 'Some consideration on the evolution of physiography of Bengal', in A. B. Chatterjee, A. Gupta, and P. K. Mukhopadhyay (eds.), West Bengal, Geographical Institute, Presidency College, Firma K. L. Mukhopadhyay, Calcutta, India. Clarke, W. (1865). 'Report of

3713-522: The Southeastern US, mallines of Argentina, Mediterranean seasonal ponds of Europe and California, turloughs of Ireland, billabongs of Australia, among many others. Wetlands are found throughout the world in different climates. Temperatures vary greatly depending on the location of the wetland. Many of the world's wetlands are in the temperate zones , midway between the North or South Poles and

3792-708: The State Govt. under the chairmanship of Minister-in-Charge, Department of Environment, Government of West Bengal. The EKWMA is guided by the East Kolkata Wetlands (Conservation and Management) Act, 2006, the East Kolkata Wetlands (Conservation and Management) Rules, 2006, and the Wetlands (Conservation and Management) Rules, 2017. This is probably only wetland which has state enacted laws as well as Central enacted laws applicable. 1. Urban Wastewater: Livelihoods, Health and Environmental Impacts in India: The Case of

3871-502: The US, the best known classifications are the Cowardin classification system and the hydrogeomorphic (HGM) classification system. The Cowardin system includes five main types of wetlands: marine (ocean-associated), estuarine (mixed ocean- and river-associated), riverine (within river channels), lacustrine (lake-associated) and palustrine (inland nontidal habitats). Peatlands are

3950-610: The United States' commercial fish and shellfish stocks depend solely on estuaries to survive. Amphibians such as frogs and salamanders need both terrestrial and aquatic habitats in which to reproduce and feed. Because amphibians often inhabit depressional wetlands like prairie potholes and Carolina bays, the connectivity among these isolated wetlands is an important control of regional populations. While tadpoles feed on algae, adult frogs forage on insects. Frogs are sometimes used as an indicator of ecosystem health because their thin skin permits absorption of nutrients and toxins from

4029-701: The World's Ecosystem Services and Natural Capital', Nature, vol. 387. Dasgupta, R. (1973). 'Contribution of botany of a portion of Salt Lakes, West Bengal', Ind.Mus. Bull., vol. 1. David, A. (1959). 'Effect of Calcutta sewage upon the fisheries of the Kulti estuary and connected cultivable fisheries', Journal of Asiatic Society (Bengal), vol. 1, No. 4. De, M., Bhunia, S., and Sengupta, T. (1989). 'A preliminary account of major wetland fauna of Calcutta and surroundings', Ecology, 3(9). Deb, S. C., and Santra, S. C. (1996). 'Bio-accumulation of metals in sewage fed aquatic system -

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4108-542: The area falling with the outer zone, which is to be investigated by the Calcutta Drainage Committee, Appendix IX', Reports of the committee to inquire into the drainage condition of Calcutta and adjoining area, Drainage Enquiry Committee, Government of Bengal, Calcutta, India. DOE (1999). Development and Management of the Calcutta canal systems and wetlands, Report of the committee constituted by

4187-422: The bioremediation of heavy metals, degradation and recycling of woody tissues of plants, oil contaminated soil and toxic compounds and nitrogen fixation along with the cyanobacters; other bacteria playing important roles in metal accumulation, oil degradation, antimicrobial compound production, enzyme production etc. (Ghosh, A., 2007). Sewage fed aquaculture based artificial wetland, like East Kolkata Wetland (EKW),

4266-486: The city's sewage and most of its domestic refuse into a rich harvest of fish and fresh vegetables. For example, the Mudially Fishermen's Cooperative Society is a collective of 300 families that lease 70 hectares into which wastewater from the city is released. Through a series of natural treatment processes – including the use of Eichhornia crassipes and other plants for absorbing oil, grease and heavy metals –

4345-634: The equator. In these zones, summers are warm and winters are cold, but temperatures are not extreme. In subtropical zone wetlands, such as along the Gulf of Mexico , average temperatures might be 11 °C (52 °F). Wetlands in the tropics are subjected to much higher temperatures for a large portion of the year. Temperatures for wetlands on the Arabian Peninsula can exceed 50 °C (122 °F) and these habitats would therefore be subject to rapid evaporation. In northeastern Siberia , which has

4424-617: The establishment of World Wetlands Day by the Ramsar Secretariat in 1997. In 1991 the West Bengal Government accepted an offer by a non-resident Indian to build a World Trade Centre and allotted 227 acres of wetlands for this purpose. As a result, the NGO People United for Better Living in Calcutta (PUBLIC) filed a public interest litigation in the Calcutta High Court arguing for the importance of

4503-504: The following areas: According to the Ramsar Convention: 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 – particularly as the profits from unsustainable use often go to relatively few individuals or corporations, rather than being shared by society as

4582-468: The interface between truly terrestrial ecosystems and aquatic systems, making them inherently different from each other, yet highly dependent on both." In environmental decision-making, there are subsets of definitions that are agreed upon to make regulatory and policy decisions. Under the Ramsar international wetland conservation treaty , wetlands are defined as follows: An ecological definition of

4661-462: The known animal species in wetlands, and are considered the primary food web link between plants and higher animals (such as fish and birds). Depending on a wetland's geographic and topographic location, the functions it performs can support multiple ecosystem services , values, or benefits. United Nations Millennium Ecosystem Assessment and Ramsar Convention described wetlands as a whole to be of biosphere significance and societal importance in

4740-461: The macro and micro level. Microbial richness of a region is its unseen asset that needs to be explored and conserved. Soil samples collected from ECW shows the presence of various new strains of microbes which are not only ecologically important but also have commercial value (Ghosh, A., 2007). These include Actinobacteria which are responsible for the degradation of nitrophenol, nitroaromatic compounds, pesticides and herbicides; Proteobacteria related to

4819-466: The nutrients contained in the wastewater sustain fish farms and agriculture. The name East Calcutta Wetlands was coined by late Dhrubajyoti Ghosh , Special Advisory (Agricultural Ecosystems), Commission on Ecosystem Management, IUCN, who reached this incredible but neglected part of the city when, while working as an engineer for the Government of West Bengal's Water & Sanitation Department, he

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4898-837: The plants and animals controlled by the wetland hydrology are often additional components of the definitions. Wetlands can be tidal (inundated by tides) or non-tidal. The water in wetlands is either freshwater , brackish , saline , or alkaline . There are four main kinds of wetlands – marsh , swamp , bog , and fen (bogs and fens being types of peatlands or mires ). Some experts also recognize wet meadows and aquatic ecosystems as additional wetland types. Sub-types include mangrove forests , carrs , pocosins , floodplains , peatlands, vernal pools , sinks , and many others. The following three groups are used within Australia to classify wetland by type: Marine and coastal zone wetlands, inland wetlands and human-made wetlands. In

4977-694: The project of The Salt Lake Reclamation & Irrigation Company Limited', in Selections from the Records of the Bengal Government (containing papers from 1865 to 1904), Calcutta, India. CMG (1945). 'Some facts about Calcutta drainage', in A. Home (ed.), The Calcutta Municipal Gazette: Official organ of the corporation, Central Municipal Office, Calcutta, India, 42(7). ______ (1964). 'Reclamation of Salt Lakes - Dr. B. C. Roy's dream' in A. Home (ed.), The Calcutta Municipal Gazette: Official organ of

5056-419: The purpose of advertisement on any land within the East Kolkata wetlands. 4. To make an order to prevent, prohibit or restrict any mining, quarrying, blasting, or other operations for the purpose of protecting or conserving the East Kolkata wetlands. 5. To take measures to abate pollution in the East Kolkata wetlands and conserve the flora, fauna and biodiversity in general. 6. To prepare action plans conforming to

5135-486: The purpose of conservation and management of the East Kolkata wetlands. There are about 100 plant species, which have been recorded in and around the East Calcutta Wetlands, including Sagittaria montividensis , Cryptocoryne ciliata , Cyperus spp., Acrostichum aureum , Ipomoea aquatica , etc. The Sunderbans used to extend up to Patuli in the 1950s. Several kinds of water hyacinths grow across these wetlands. Local farmers and fisher folk use water hyacinth to create

5214-592: The resolutions taken and recommendations made, from time to time, under the Ramsar Convention and to update the land use maps of the East Kolkata wetlands. 7. To implement and monitor the activities specified in the action plans. 8. To promote research and disseminate findings of such research among the stakeholders; 9. To raise awareness about the utility of the wetlands in general and the East Kolkata wetlands in particular. 10. To promote basic conservation principles like sewage fed pisciculture and eco-tourism in

5293-402: The scope of this project. 16. To enter any land or premises, including to collect samples of air, water, soil and other biological resources, within the scope of this project. 17. To call for relevant records and documents and information from any department, organisation or local body within the scope of this project. 18. To do such act, or pass such order, which may be necessary and expedient for

5372-429: The soil and underlying rock into aquifers which are the source of much of the world's drinking water . Wetlands can also act as recharge areas when the surrounding water table is low and as a discharge zone when it is high. Mangroves , coral reefs , salt marsh can help with shoreline stabilization and storm protection. Tidal and inter-tidal wetland systems protect and stabilize coastal zones. Coral reefs provide

5451-537: The soil of wetlands. Anaerobic and aerobic respiration in the soil influences the nutrient cycling of carbon, hydrogen, oxygen, and nitrogen, and the solubility of phosphorus thus contributing to the chemical variations in its water. Wetlands with low pH and saline conductivity may reflect the presence of acid sulfates and wetlands with average salinity levels can be heavily influenced by calcium or magnesium. Biogeochemical processes in wetlands are determined by soils with low redox potential. The life forms of

5530-412: The soils and plants at higher elevations. Plants and animals may vary within a wetland seasonally or in response to flood regimes. There are four main groups of hydrophytes that are found in wetland systems throughout the world. Submerged wetland vegetation can grow in saline and fresh-water conditions. Some species have underwater flowers, while others have long stems to allow the flowers to reach

5609-530: The sources of water include tidal wetlands , where the water source is ocean tides ); estuaries , water source is mixed tidal and river waters; floodplains , water source is excess water from overflowed rivers or lakes; and bogs and vernal ponds , water source is rainfall or meltwater . The world's largest wetlands include the Amazon River basin , the West Siberian Plain ,

5688-406: The spatial and temporal dispersion, flow, and physio-chemical attributes of surface and ground waters. Sources of hydrological flows into wetlands are predominantly precipitation , surface water (saltwater or freshwater), and groundwater. Water flows out of wetlands by evapotranspiration , surface flows and tides , and subsurface water outflow. Hydrodynamics (the movement of water through and from

5767-719: The surface of the water. When trees and shrubs comprise much of the plant cover in saturated soils, those areas in most cases are called swamps . The upland boundary of swamps is determined partly by water levels. This can be affected by dams Some swamps can be dominated by a single species, such as silver maple swamps around the Great Lakes . Others, like those of the Amazon basin , have large numbers of different tree species. Other examples include cypress ( Taxodium ) and mangrove swamps. Many species of fish are highly dependent on wetland ecosystems. Seventy-five percent of

5846-496: The surface. Submerged species provide a food source for native fauna, habitat for invertebrates, and also possess filtration capabilities. Examples include seagrasses and eelgrass . Floating water plants or floating vegetation are usually small, like those in the Lemnoideae subfamily (duckweeds). Emergent vegetation like the cattails ( Typha spp.), sedges ( Carex spp.) and arrow arum ( Peltandra virginica ) rise above

5925-464: The surrounding environment resulting in increased extinction rates in unfavorable and polluted environmental conditions. Reptiles such as snakes , lizards , turtles , alligators and crocodiles are common in wetlands of some regions. In freshwater wetlands of the Southeastern US, alligators are common and a freshwater species of crocodile occurs in South Florida. The Florida Everglades

6004-440: The types of plants that live within them. Specifically, wetlands are characterized as having a water table that stands at or near the land surface for a long enough period each year to support aquatic plants . A more concise definition is a community composed of hydric soil and hydrophytes . Wetlands have also been described as ecotones , providing a transition between dry land and water bodies. Wetlands exist "...at

6083-458: The wetlands and why they should be left as they were. The order of Justice Umesh Chandra Banerjee on this matter is considered a landmark judgment. Not only did it go into the definition of wetlands and a review of their status in countries such as Australia and the US, he also brought to bear his own research on their functional values and role in "maintaining micro-climatic conditions, absorbing pollution...habitat for aquatic flora fauna... providing

6162-502: Was passed - the first such case of a major environmental legislation being enacted by a state - as distinct from the central - government. Many city promoters have silently accepted the dominance of Bonani Kakkar . Many promoters have told anonymously that they settle with them with consideration otherwise the NGO PUBLIC run by Kakkar will take them to court. The business model of this is weaponising environmental issues and threat to promoters of court and police. Forcing them to settle. That

6241-533: Was searching for an answer to the question: What exactly happens to the city sewage? These natural water bodies which were known just as fisheries provided the answer. Devised by local fishermen and farmers, these wetlands served, in effect, as the natural sewage treatment plant for the city. The East Kolkata Wetlands host the largest sewage fed aquaculture in the world. It's not widely known that Wetlands Day originated in Kolkata on June 16, 1990, seven years prior to

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