|Central coordinates||79o 44.22' East 11o 56.85' North|
|IBA criteria||A4i, A4iii|
|Year of IBA assessment||2004|
Site description Ousteri lake is located partly in Pondicherry and partly in Tamil Nadu near Ossudu village in the Villanur commune panchayat, about 12 km from Pondicherry, north of the Kaveri river. The lake depends on its catchment for 75% of its water, the rest comes from diversion channels. The lake is fed by local run-off and an intermittent river and has a bund on its western bank. It has an average depth of 1 m and dries up completely in summer. Besides being an internationally important site for migratory birds, the lake’s most valuable use is for irrigation. The lake has rich floral diversity of over 200 species of plants belonging to 60 families. Part of the bund is well protected by trees. It has extensive aquatic flora of the floating, submerged and emergent type.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Cotton Pygmy-goose Nettapus coromandelianus||-||2004||present [units unknown]||-||A4i||Least Concern|
|Eurasian Wigeon Anas penelope||-||2004||present [units unknown]||-||A4i||Least Concern|
|Little Cormorant Phalacrocorax niger||-||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)|
|Notes: Water management|
Acknowledgements Key contributors: Priya Davidar, Aju Mukhopaddhyay, Supriya Jhunjhunwala and S. Balachandran.
Ali, S. and Ripley, S. D. (1987) Compact Handbook of the Birds of India and Pakistan (Second Edition). Oxford University Press, Delhi.
Balachandran, S. and Alagahrajan, R. (1995) An ecological survey of the wetlands of Pondicherry with special reference to Ousteri lake. Institute of Restoration of Natural Environment, Nagercoil. Pp. 40.
Grimmett, R., Inskipp, C. and Inskipp, T. (1998) Birds of the Indian Subcontinent. Christopher Helm Ltd., London, U.K.
Jhunjhunwala, S. (1998) The ornithological importance of Ousteri lake and Bahour lake: A study of the habitat preferences of their waterfowl and waders. M.Sc. Dissertation. Salim Ali School of Ecology and Environmental Sciences, Pondicherry University.
Wetlands International (2002) Waterbirds Population Estimates: Third Edition. Wetlands International Global Series No. 12. Wageningen, the Netherlands.
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