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Download Download Published online: December 15, 2020 ISSN : 0974-9411 (Print), 2231-5209 (Online) journals.ansfoundation.org Review Article A review on distribution and importance of wetlands in the perspective of India Ashish Kumar Arya* Department of Environmental Science, Graphic Era University, Dehradun (Uttarakhand), India Article Info Kamal Kant Joshi https://doi.org/10.31018/ Department of Environmental Science, Graphic Era Hill University, Dehradun (Uttarakhand), jans.v12i4.2412 India Received: October 28, 2020 Archana Bachheti Revised: December 11, 2020 Department of Environmental Science, Graphic Era University, Dehradun (Uttarakhand), India Accepted: December 13, 2020 Deepti Department of Environmental Science, Graphic Era University, Dehradun (Uttarakhand), India *Corresponding author. Email: [email protected] How to Cite Arya A. K. et al. (2020). A review on distribution and importance of wetlands in the perspective of India. Journal of Applied and Natural Science, 12(4):710 - 720. https://doi.org/10.31018/jans.v12i4.2412 Abstract Biodiversity is not equally distributed across the world. It depends on the type of various habitats and food availability. In these habitats, wetlands play an import role to increase the biodiversity of the particular area. Many studies have focused on various habitats to conserve biodiversity. However, the wetland studies are very few due to the lack of information on their distribution and importance. The present review focusses on the wetland status and their importance in India. India has vibrant and diverse wetland ecosystems that support immense biodiversity. The wetlands are unique habitats which provide ecological, social and economic values. However, rapid urbanization, industrialization and uncontrolled agricultural practices have pressurized to shrink the wetlands in India. The present paper highlights the wetland habitats in India with their geographical location, distribu- tion, avian species diversity and their significance. The paper also discusses the growing threats like climate change, land-use change and agriculture/ municipal waste to the wetlands and the conservation efforts by Indian government policies, i.e. Nation- al Wetland Conservation Programme, National Environmental Policy, and National Plan for conservation of the aquatic ecosys- tem. In addition, on the basis of previous studies on wetlands, it is suggested that the role of stakeholders is very much respon- sible for wetland conservation. Keywords: Avian biodiversity, Biodiversity, Conservation, Migratory birds, Wetlands INTRODUCTION The wetlands are a very important part of human civili- zation, according to ancient literature, much human Wetlands are one of the most productive ecosystems civilization developed near the riverine system or wet- of our natural environment (Ghermandi et al., 2010). land areas. They are fulfilling many crucial needs like They are highly supported by many creatures, includ- water, protein production, water purification, biodiver- ing birds. Wetlands cover 15.26 million hectares of sity, flood control, recreation and research-education space in India (Prasad et al., 2002; SAC, 2011). Gen- etc. Wetlands have great cultural, social, ecological erally, wetlands are shallow water lands which support and economic values (Ramachandra et al., 2002). the growth of various flora and fauna ( reptiles, am- Wetlands in India are degrading very fast. In India, phibians, fish and other invertebrates (Mitsch and many reasons have been identified which are respon- Gosselink, 2000). It is reported that wetlands are suita- sible for wetland degradation such as unsustainable ble habitat for avian species. Total 1340 bird species agriculture practice, construction of human settlement have been recorded in India (Ali and Ripley, 1987; around the wetlands, cattle grazing and the construc- Grimmett et al., 2016) with 38 endemic species tion of dams, respectively. In addition, increasing hu- (Praveen et al., 2016). Of the total, about 310 species man population, unsustainable development, and lack are considered as wetland birds (Kumar et al., 2005). of awareness are responsible causes to decline the The diversity of any wetland depends upon the water wetland areas (Ramachandra et al., 2002). Natural quality and the vegetation around the wetland for the calamities are also accountable for the wetland degra- survival of the species (Buckton, 2007). dation reported (Bennett et al., 2018). Sometimes wet- This work is licensed under Attribution-Non Commercial 4.0 International (CC BY-NC 4.0). © : Author (s). Publishing rights @ ANSF. Arya A. K. et al. / J. Appl. & Nat. Sci. 12(4): 710 - 720 (2020) lands areas are used for crop cultivation and that way Table 1. Classification system of wetlands. change into their habitat effects on biodiversity. At the Wetland S. No. Type of Wetland Global level, habitat destruction via land-use change Category has been identified as one of the causes responsible Deltas, Tidal marshes and 1. Estuarine for loss of biodiversity (Butchart et al. 2010, Sala et al. Mangrove swamps 2000). The present review article focuses on the distri- 2. Lacustrine Natural Lakes bution of wetlands in India, importance and strategy for 3. Marine Coastal wetland conservation of wetlands. 4. Riverine River and Stream Wetlands encompass a wide array of “wetlands” also Marshy – Marshes, Swamps 5. Palustarine called marshes, bogs, swamps, fens, pocosins, and and Bogs other names” (Tiner, 1999). Wetlands are neither truly Source: Cowardin et al. (1979) aquatic nor terrestrial; generally, it depends on sea- sonal variability. This transitional nature of wetland CLASSIFICATION OF WETLANDS IN INDIA creates complexity to delineate the boundaries of wet- The area of wetlands is widely distributed in India lands. On the other hand, it enhances the diversity with ranging from Himalayan region to Deccan knap. India reference to flora and fauna of that area due to their has a different type of climatic and topographic condi- geographical location and habitat characteristics. tions to be responsible for a high diversity of flora and Based on multifaceted observations and diverse objec- fauna (Prasad et al., 2002). National Wetland Atlas tive and orientation, different individuals, institutions (2011) classified the Indian wetlands in three levels, and agencies have defined wetlands in their own i.e. Level 1 to Level 3. Level-1 wetlands are divided ways. In addition, many countries also defined wet- into two classes- Inland and coastal areas respective- lands as per their domestic legislation (MOEF, 2007). ly, and Level-2 types are categorized into natural and Ramsar Convention is only one International agree- man-made categories. However, in Level 3, types of ment signed in 1971 to make the action plans on a wetlands are natural and man-made wetlands and national and international level for conservation of the these are further classified into 19 subcategories on wetlands and their resources (Bassi et al., 2014). In the basis of temporal vegetation, climatic and topo- this convention, a total of 2300 Ramsar sites were in- graphic conditions (Table 2). troduced in the World (Ramsar, 2013) and were fo- cused for their conservation. DISTRIBUTION OF WETLANDS IN INDIA As per the Ramsar Convention, (article 1.1) the wet- Wetlands are vital for human survival. At a global level, lands are defined as “Areas of the marsh, fen, peat- 2 land or water, whether natural or artificial, permanent wetlands cover a total area of 12.1 million km and or temporary, with water that is static or flowing, fresh, account for 40.6% of the total global ecosystem ser- brackish or salt, including areas of marine water the vices (ES) value (Costanza et al., 2014; Gardner and depth of which at low tide does not exceed six me- Finlayson, 2018). However, India has various types of ters” (Ramsar Convention, 1971, Article 1.1). water resources in the form of rivers, streams and coastal areas. India has 757,060 wetlands covering WETLANDS CLASSIFICATION about 15.26 million hectares area, which is around In 1979, the US Fish and Wildlife Service published 4.63 % of the total geographical area of the country. Out of these, 45,658 are Inland natural and 142,812 and adopted a classification of wetlands and deep- Inland man-made wetlands (Table 3; Fig-1). India has water habitats of the United States (Cowardin et al., a very large area of coastal wetlands, including the 1979). The wetlands are categorized on the basis of 10,204 natural and 2829 man-made coastal wetlands the hydrological, ecological and geological condition of (SAC, 2011). Inland wetlands cover an area of 10.56 the area. Accordingly, on the basis of this classifica- million hectares (69.23%) and area under coastal wet- tion, wetlands are divided into five major categories lands is 4.14 million hectares (27.13%). The small (Table 1). Table 2. Indian wetland classification (Source: National Wetland Atlas, 2011). 711 Arya A. K. et al. / J. Appl. & Nat. Sci. 12(4): 710 - 720 (2020) types wetland (< 2.25 ha) cover about 3.64 percent of source. In addition, give attention to the scientific com- land area (0.56 million hectares) and it is assumed munity for their basic ecological functions of wetlands that each is about of one ha (SAC,2011). and their economic, social, aesthetic, and scientific As per the Indian wetland classification, India has a significances (Sarkar, 2011). India signed a Ramsar total of 75, 7060 wetlands which are distributed in dif- convention on 1st February 1982 and at present India ferent states of India (National Wetland Atlas, 2011). has 41 Ramsar sites (Table 4) which cover about State-wise numbers of wetland are shown in Fig 2. 1,071,861 hectares area (Ramsar, 2013; MoEFaCC, However, the Indian Himalayan Region has shown 2020a; MoEFaCC, 2020b). less number of wetlands areas as compared to the IMPORTANCE OF WETLANDS plain areas ( Fig 2). The records indicate that total numbers of Inland (natural) wetlands are 45658, man- Wetlands are generally used in many ways, mainly for made is 142812, coastal wetland (natural) are 10204, irrigation services, fisheries, and recreation activities. and man-made are 2829 respectively.
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