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Pinus torreyana ssp. insularis

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_onStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA PINOPSIDA PINALES PINACEAE

Scientific Name: Pinus torreyana ssp. insularis
Species Authority: J.R.Haller
Parent Species:
Common Name/s:
English Santa Rosa Island Pine

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2013
Date Assessed: 2011-04-13
Assessor/s: Farjon, A.
Reviewer/s: Thomas, P. & Stritch, L.
Justification:

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.

History:
1998 Endangered
1997 Endangered (Walter and Gillett 1998)

Geographic Range [top]

Range Description: Endemic to Santa Rosa Island (Santa Barbara County), southern California, USA.
Countries:
Native:
United States (California)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This tiny population of ca. 1000 mature trees covers less than 100 ha in two subpopulations on a near-shore island
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Grows on steep and/or open slopes and in canyons near the coast 10-100 m asl), forming small stands.
Systems: Terrestrial

Threats [top]

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 [top]

Conservation Actions: The entire population is protected within a reserve.

Bibliography [top]

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. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 24 April 2014.
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