Pinus torreyana ssp. insularis
|Scientific Name:||Pinus torreyana ssp. insularis|
See Pinus torreyana
|Taxonomic Source(s):||Farjon, A. 2010. A Handbook of the World's Conifers. Koninklijke Brill, Leiden.|
|Red List Category & Criteria:||Vulnerable D2 ver 3.1|
|Reviewer(s):||Thomas, P. & Stritch, L.|
The extent of occurrence and area of occupancy are very small and well within the thresholds for Critically Endangered, but there is no evidence of decline. The estimate of 1,000 mature trees, probably not accurate, could in reality be either below or above this figure. So what remains is the area of occupancy of less than 100 hectares (1 km²) and the risk of stochastic events, making this taxon Vulnerable under criterion D.
|Previously published Red List assessments:|
|Range Description:||Endemic to Santa Rosa Island (Santa Barbara County), southern California, USA.|
Native:United States (California)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This tiny population of ca. 1000 mature trees covers less than 100 ha in two subpopulations on a near-shore island|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Grows on steep and/or open slopes and in canyons near the coast 10-100 m asl), forming small stands.|
|Continuing decline in area, extent and/or quality of habitat:||No|
|Generation Length (years):||30|
|Use and Trade:||No uses have been recorded for this species.|
|Major Threat(s):||This subspecies is at high risk from stochastic events such as fire, pest infestation, or disease, all of which could wipe out this subspecies easily. The trees enjoy legal protection, but that is not an effective buffer against these risks.|
|Conservation Actions:||The entire population is protected within a reserve.|
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.
Griffin, J.R. and Critchfield, W.B. 1972. The distribution of forest trees in California. USDA Forest Service, Research Paper PSW-82 (reprinted with supplement, 1976). Pacific Southwest Forest and Range Experiment Station, Berkeley, CA.
IUCN. 2013. IUCN Red List of Threatened Species (ver. 2013.1). Available at: http://www.iucnredlist.org. (Accessed: 12 June 2013).
Lanner, R.M. 1999. Conifers of California. Cachuma Press, Los Olivos, California.
|Citation:||Farjon, A. 2013. Pinus torreyana ssp. insularis. The IUCN Red List of Threatened Species 2013: e.T34013A2840313.Downloaded on 01 July 2016.|
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