Wetlands are important for so many reasons: Wetlands prevent flooding by holding water much like a sponge. By doing so, wetlands help keep river levels normal and filter and purify the surface water.
Wetlands accept water during storms and whenever water levels are high. When water levels are low, wetlands slowly release water. Wetlands also release vegetative matter into rivers, which helps feed fish in the rivers. Wetlands help to counter balance the human effect on rivers by rejuvenating them and surrounding ecosystems.
Nal Sarovar: Nal Sarovar Bird Sanctuary, consisting primarily of a huge lake and ambient marshes, is situated about 64 km to the West of Ahmedabad near Sanand Village, in the Gujarat state of India. Mainly inhabited by migratory birds in winter and spring, it is the largest wetland bird sanctuary in Gujarat, and one of the largest in India.
The lake measures 123 km2, attracts over 210 species of birds in the winter, and harbors a variety of flora and fauna. Thousands of migratory waterfowl flock to this sanctuary just after the Indian monsoon season. The shallow area and ponds on the outer fringes of the lake attract the wading birds that feed in the shallow waters. Besides a few mammalian species including the endangered wild ass and the black buck, its migratory bird population includes rosy pelicans, flamingoes, white storks, brahminy ducks and herons.
Source: Wikipedia
http://www.mbgnet.net/fresh/wetlands/why.htm
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