|Central coordinates||79o 50.00' East 12o 10.00' North|
|IBA criteria||A1, A4i, A4iii|
|Altitude||0 - 1m|
|Year of IBA assessment||2004|
Site description Kaliveli Tank is a semi-permanent, fresh to brackish water lagoon, which empties into the sea through a narrow channel connecting the tank with the Yedayanthittu Estuary to the northeast. The water level in the tank fluctuates according to precipitation; the tank reaches its maximum extent at the end of the Northeast Monsoon, and in years of low rainfall, dries out completely for a few months during the summer. At such times, the encroachment of paddy fields reduces the size of the tank by as much as one third. The average depth of water at the end of the monsoon is about 1 m, and the maximum after heavy rainfall, about 2 m. By the end of the monsoon, the lagoon is normally full of fresh water, from the run-off from neighbouring farmland. Subsequently, as the inflow of fresh water diminishes, there is some inflow of seawater from the estuary, and the lagoon becomes brackish, particularly at its northern end. The lagoon is occasionally flooded by seawater during cyclonic disturbances (Scott 1989). Yedayanthittu estuary lies about 3 km to the northeast of the tank. This estuary has large areas of inter-tidal mudflats, but only tiny relicts of the once extensive mangrove forests now remain. There are some 500 ha of saltpans alongside the estuary immediately to the north of the Marakkanam road bridge across the channel from Kaliveli Tank. Until about 25 years ago, the entire region was heavily forested, but almost all the forest has been cleared, and the tank and estuary are now surrounded by cultivation and scrubby thorn woodland. There are some low sand dunes by the channel linking the tank to the estuary. The Kaliveli watershed extends from Auroville Plateau south for about 30 km and has an area of approximately 25,000 ha (Scott 1989). These sites have a wide variety of sedges and grasses, interspersed with barren sandy areas and muddy margins. As the lake fills with fresh water in November, numerous aquatic plants germinate. Amongst the many species of algae in the brackish areas, Enteromorpha intestinalis is particularly common. There are extensive reed beds and sedges in the less saline areas. A few straggly mangrove bushes are all that remain of what must once have been a large mangrove forest (Pieter 1987). The wetlands are situated amidst agricultural land and arid thorn scrub.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Ruddy Shelduck Tadorna ferruginea||-||2004||present [units unknown]||-||A4i||Least Concern|
|Red-crested Pochard Netta rufina||-||2004||present [units unknown]||-||A4i||Least Concern|
|Greater Flamingo Phoenicopterus roseus||-||2004||present [units unknown]||-||A4i||Least Concern|
|Asian Openbill Anastomus oscitans||-||2004||present [units unknown]||-||A4i||Least Concern|
|Spot-billed Pelican Pelecanus philippensis||-||2004||present [units unknown]||-||A1, A4i||Near Threatened|
|Greater Spotted Eagle Aquila clanga||-||2004||present [units unknown]||-||A1||Vulnerable|
|Lesser Sand Plover Charadrius mongolus||-||2004||present [units unknown]||-||A4i||Least Concern|
|Little Stint Calidris minuta||-||2004||present [units unknown]||-||A4i||Least Concern|
|Curlew Sandpiper Calidris ferruginea||-||2004||present [units unknown]||-||A4i||Least Concern|
|A4iii Species group - waterbirds||unknown||2004||20,000 individuals||unknown||A4iii|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
|Notes: Nature conservation and research|
|Notes: Water management|
Acknowledgements Key contributors: M. Krishnan, Craig Robson and C. Perennou.
Perennou, C. (1987) Two Important Wetlands near Pondicherry. Blackbuck, Vol. 3(3&4); 3-11.
Perennou, C. (1989) Southern wintering range of some waterbirds. J. Bombay Nat. Hist. Soc. 86: 247-248.
Pieter (1987) Kaliveli Tank and Yedayanthittu Estuary - a little known wetland habitat in Tamil Nadu. J. Bombay Nat. Hist. Soc 84: 210-214.
Scott, D. A. (1989) A Directory of Asian Wetlands. IUCN, Gland, Switzerland, xiv+1181 pp., 33 maps.
Wetlands International (2002). Waterbird Population Estimates: Third Edition. Wetlands International Global Series No. 12. Wageningen, the Netherlands.
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Kaliveli Tank and Yeduyanthittu estuary. Downloaded from http://www.birdlife.org on 13/12/2013
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