|Central coordinates||88o 24.92' East 27o 55.38' North|
|IBA criteria||A1, A2, A3|
|Altitude||4,260 - 7,459m|
|Year of IBA assessment||2004|
Site description Lhonak Valley is a Trans-Himalayan grassland in the exposed river valley of Goma Chu in northwest Sikkim, with boggy marshes, glacial lakes, barren scree slopes and glaciers. It is accessible from Thangu via the high 5,900 m pass, the Lungnak La. Snowfall makes the Valley inaccessible in winter. Goma Chu originates in North and South Lhonak glaciers and runs across the Valley to join Zema Chu. Zemu glacier is at the southern end of the Valley, as is the Green Lake. This Valley is the only known breeding area in the Eastern Himalayas of the Black-necked Crane Grus nigricollis (Ganguli-Lachungpa 1998). Lakes and marshes here are used as stopover sites for migratory waterbirds (Ganguli-Lachungpa 2002) and support populations of the Sikkim Snow Toad Scutiger sp. Vegetation is typical cold desert, with xerophytic species such as Ephedra gerardiana, herbs, grasses and sedges, aquatic weeds and many medicinal and commercially valuable plants such as Picrorhiza kurrooa and Meconopsis horridula.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Lesser Kestrel Falco naumanni||-||2004||present [units unknown]||-||A1||Least Concern|
|Black-necked Crane Grus nigricollis||-||2004||present [units unknown]||-||A1, A3||Vulnerable|
|Wood Snipe Gallinago nemoricola||-||2004||present [units unknown]||-||A1, A3||Vulnerable|
|Broad-billed Warbler Tickellia hodgsoni||-||2004||present [units unknown]||-||A2||Least Concern|
|Giant Babax Babax waddelli||-||2004||present [units unknown]||-||A2, A3||Near Threatened|
|Hoary-throated Barwing Actinodura nipalensis||-||2004||present [units unknown]||-||A2||Least Concern|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Land-use||Extent (% of site)|
|Notes: Forestry operation|
|Notes: Military deployment|
|nature conservation and research||-|
|Notes: GREF work; Nature conservation and research|
|Notes: Tourism/recreation/mountaineering expeditions|
Acknowledgements Key contributor: Usha Lachungpa.
Ali, S. (1962). The Birds of Sikkim. Oxford University Press, Madras.
Anonymous (2003) Sikkim State Biodiversity Strategy and Action Plan. Department of Forests, Environment and Wildlife, Govt. of Sikkim. Pp. 104.
Ganguli-Lachungpa, U. (1998) Attempted breeding of Black-necked crane Grus nigricollis Przevalski in north Sikkim. J. Bombay Nat. Hist. Soc. 95(2): 341.
Ganguli-Lachungpa, U. (2002) Avifauna of trans-Himalayan and alpine grasslands in Sikkim, India. In: Birds of Wetlands and Grasslands: Proceedings of the Salim Ali Centenary Seminar, 1996 (eds. Rahmani, A. R. and Ugra, G.). Bombay Natural History Society, Mumbai. pp 196-207.
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Recommended citation BirdLife International (2014) Important Bird Areas factsheet: Lhonak Valley. Downloaded from http://www.birdlife.org on 14/03/2014
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