Abies delavayi ssp. fansipanensis
|Scientific Name:||Abies delavayi Franch. ssp. fansipanensis (Q.P.Xiang) Rushforth|
See Abies delavayi
Abies fansipanensis Q.P.Xiang
|Taxonomic Source(s):||Farjon, A. 2010. A Handbook of the World's Conifers. Koninklijke Brill, Leiden.|
|Taxonomic Notes:||This tree has previously been known as Abies delavayi var. nukiangensis in major references such as Vietnam Red Data Book (Anon. 1996) and the Flore du Cambodge, du Laos et du Viet Nam (Hiêp and Vidal 1996). It was redescribed as a new species (Xiang 1997) on the basis of cone characters and then reduced to a subspecies by Rushforth (1999).More recent investigations suggests that the original separate specific status could be more appropriate.|
|Red List Category & Criteria:||Critically Endangered B1ab(i,ii,v)+2ab(i,ii,v); C1+2a(ii) ver 3.1|
|Assessor(s):||Rushforth, K., Xiang, Q. & Carter, G.|
|Reviewer(s):||Thomas, P. & Farjon, A.|
The assessment of Critically Endangered is based on its very limited distribution within a single location, its small population size, an absence of regeneration and decline in quality of habitat along with an estimated continuing decline of 25% over the next generation. The assessment is based on field investigations carried out by K. Rushforth between 1992 and 2001.
|Previously published Red List assessments:|
|Range Description:||This species is endemic to Viet Nam, where is is found in Lao Cai Province (Mt. Fan Si Pan). Restricted to the east flank of Fan Si Pan (Phan Si Pan) between circa 2,600-2,800 m in a forest composed of mature trees with few intermediate age classes and few seedlings. The lower forest band was destroyed by forest fire in late 1970s/early 1980s and there has been no subsequent regeneration.|
Attempts to find it on high peaks further south in the Hoang Lien Son range have not yielded any other populations.
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Circa 200-250 mature trees, few seedlings.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||Abies delavayi ssp. fansipanensis is endemic on Mt. Fan Si Pan, the highest mountain in Viet Nam in the extreme NW of the country. It is an outlier of a widespread species group found where there are periods of high summer rainfall. It grows on the eastern flank of this granitic mountain at altitudes between c. 2,600 m and 2,800 m asl as an emergent tree in primary evergreen tropical high montane forest. Rainfall is very high, to 3,500 mm or more per year with frequent clouds cover on the summit. Snow is common for periods of the winter, with minima temperatures probably in the range of -15ºC. Associated taxa are a Borinda species of bamboo, Acer, Sorbus, Daphne and Rhododendron spp.|
|Generation Length (years):||15|
|Major Threat(s):||Currently the main threats are forest fires caused by lightning and those associated with tourist activities and development. The main route to the summit of the Viet Nam’s highest mountain passes through the forest, with an increasing number of people visiting the summit. Currently there is no direct logging risk as the area is too inaccessible and the species occurs in a protected area.|
|Conservation Actions:||Entire known population occurs within a national park. Small ex-situ cultivation.|
Anon. 1996. Red Data Book of Vietnam - Plants. Science and Technology Publishing House, Hanoi. (in Vietnamese).
Farjon, A. 2010. Conifer Database (June 2008). In: Species 2000 & ITIS Catalogue of Life: 2010 Annual Checklist (Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., eds). Reading, UK Available at: http://www.catalogueoflife.org/.
Farjon, A. 2010. A Handbook of the World's Conifers. Koninklijke Brill, Leiden.
Hiêp, N.T. and Vidal, J.E. 1996. Flore di Cambodge di Laos et du Vietnam. Muséum National D'Histoire Naturelle, Paris.
IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.2). Available at: http://www.iucnredlist.org. (Accessed: 10 November 2011).
Rushforth, K.D. 1999. Taxonomic notes on some Sino-Himalayan conifers. International Dendrology Society Yearbook 1998: 60-63.
Xiang, Q.-P. 1997. Abies fansipanensis - a new species of the genus Abies from Vietnam. Acta Phytotaxonomica Sinica 35(4): 356-359.
|Citation:||Rushforth, K., Xiang, Q. & Carter, G. 2011. Abies delavayi ssp. fansipanensis. The IUCN Red List of Threatened Species 2011: e.T44724A10943353.Downloaded on 18 January 2018.|
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