Lhonak Valley (18374)
India, Asia
Site overview
KBA status: confirmed
Year of last assessment: 2005
National site name: Lhonak Valley
Central coordinates: Latitude: 27.9230, Longitude: 88.4153
System: freshwater, terrestrial
Elevation (m): 4260 to 7459
Area of KBA (km2): 342.9996
Protected area coverage (%): 3.71
KBA classification: Global/Regional TBD
Legacy site: Yes
Site details
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.
Rationale for qualifying as KBA: This site qualifies as a Key Biodiversity Area of international significance because it meets one or more previously established criteria and thresholds for identifying sites of biodiversity importance (including Important Bird and Biodiversity Areas, Alliance for Zero Extinction sites, and Key Biodiversity Areas) KBA identified in the CEPF Ecosystem Profile of the Eastern Himalayas Hotspot (2005). Taxonomy, nomenclature and threat category follow the 2002 IUCN Red List.
Additional biodiversity: AVIFAUNA: Lhonak Valley is the famed flyway of migratory waterfowl (Ali 1962). Many Vulnerable and Biome-5 restricted species breed here such as the Tibetan Snowcock Tetraogallus tibetanus, Blacknecked Crane (unsuccessful nesting attempt at Tebleh Tso, Muguthang), the Tibetan Sandgrouse Syrrhaptes tibetanus, the Güldenstädt’s Redstart Phoenicurus erythrogaster, the Hume’s Groundpecker Pseudopodoces humilis. Lesser Kestrel Falco naumanni has been infrequently recorded from this valley during the course of the Alpine Grassland Ecology Project of BNHS from 2000-2003 (U. Lachungpa pers. comm. 2003). OTHER KEY FAUNA: Mammalian fauna includes Snow Leopard Uncia uncia, Blue Sheep Pseudois nayaur, Tibetan Wolf Canis lupus chanco, Tibetan Fox Vulpes vulpes, Siberian Weasel Mustela sibirica, Woolly Hare Lepus oiostolus and Himalayan Marmot Marmota himalayana. Sikkim Snow Toad Scutiger sp., perhaps the highest altitude amphibian, is found in almost all lakes and waterbodies of the Goma Chu Valley.
Habitats
Land use: forestry | military | nature conservation and research | tourism/recreation
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Grassland | 50 | |
| Forest | 50 |
Threats
Summary of threats to biodiversity at KBA: MAIN THREATS: Accumulation of non-biodegradeable garbage; Stray dogs around army camps; Spread of disease to wildlife; Collection of wild medicinal plants; Poaching/snaring of wildlife. Overuse of Tchopta-Lungnak La- Muguthang trail and habitat by pack animals (horses, yaks) of Assam Rifles has been reported during the Sikkim Biodiversity Strategy and Action Plan exercise of the State Forest Department. Besides large numbers of horses on the trail to ferry rations across the La (La = Pass), the attendant hazards of harvesting/collection of commercially valuable medicinal plants such Picrorhiza kurrooa, Nardostachys grandiflora and poaching of Blue Sheep and Himalayan Marmot by the travellers have been reported (Anon. 2003) The military has a permanent station here with many outposts, as there have been incidents of Tibetan refugees coming in over the passes. As a result of past airdrops, till date, one can see broken jerry cans and sacks of coir padding littering the landscape. The valley is home to seven families of nomadic Tibetan graziers or Dokpas who graze yak in a rotational system governed by traditional laws. Perhaps due to the outside sheep brought into the Valley for food for the military, a disease has killed off the entire local sheep population, and according to the local Animal Husbandry authorities, the disease may still persist in wild snails found in the marshes and wetlands of the region. Hence, there is every possibility of the disease spreading to the wild ungulates in this IBA (U. Lachungpa pers. comm. 2003.). On finishing their duration, usually over a year or two, in this difficult region, the military personnel leave their pet dogs behind. These ‘pet’ dogs survive by scavenging kitchen and mess wastes. They have multiplied over the years and have now taken to roaming in packs on the plateau in Tso Lhamo, Lhonak and Lashar, hanging around army camps during mealtimes, preying upon wildlife and have even been seen swimming in the glacial lakes after Brahminy Shelduck chicks. Of late, they have taken to preying upon domestic livestock of the Dokpas. In order to protect the wildlife of this site, these free-roaming ‘pet’ dogs need to be eliminated without further delay.
| Threat level 1 | Threat level 2 | Threat level 3 | Timing |
|---|---|---|---|
| Invasive & other problematic species, genes & diseases | Invasive non-native/alien species/diseases | Named species | Ongoing |
| Biological resource use | Hunting & collecting terrestrial animals | Intentional use (species being assessed is the target) | Ongoing |
| Biological resource use | Hunting & collecting terrestrial animals | Persecution/control | Only in the future |
| Biological resource use | Gathering terrestrial plants | Unintentional effects (species being assessed is not the target) | Ongoing |
| Pollution | Garbage & solid waste | Ongoing | |
| Residential & commercial development | Commercial & industrial areas | Ongoing | |
| Transportation & service corridors | Roads & railroads | Ongoing |
Additional information
References: 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.
Contributors: Key contributor: Usha Lachungpa.