|Scientific Name:||Pinus radiata|
|Infra-specific Taxa Assessed:|
|Red List Category & Criteria:||Endangered B2ab(ii,iii,v) ver 3.1|
|Reviewer/s:||Thomas, P., Perez de la Rosa, J. & Stritch, L.|
Based on the assessments of the two varieties, it is considered that although the large subpopulation on Cedros Island (var. binata) appears stable, the situation on the mainland (var. radiata) is more severe and in total the population is in continuing decline. There are no more than five locations and the population is severely fragmented. With a combined area of occupancy of less than 30 km² the species meets B2 for Endangered.
|Range Description:||The typical variety of Monterey Pine occurs along the coast of California in three disjunct populations in San Mateo and Santa Cruz counties, Monterey County, and San Luis Obispo County. Pinus radiata var. binata occurs on Guadalupe and Cedros islands, Mexico. Although trees on these islands differ in morphology from those in the United States, they have been shown to be most closely related to P. radiata.|
Native:Mexico (Baja California, Guadalupe I.); United States (California)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Subpopulations exist on the mainland coast of California (three) and on two islands off the coast of Mexico (two to three); only one of these is healthy and regenerating well.|
|Habitat and Ecology:||Pinus radiata is in its natural habitat confined to promontories and strips of rocky coast as well as two offshore islands; it is rarely found more than 11 km from the sea. The cold ocean water moving down the Californian coast substantially influences the local climate, raising humidity, tempering heat from the sun and causing almost daily summer fogs. On a rare clear day in summer temperatures can quickly rise to 40º C, coming down to only 15º C on the next foggy day. On Guadalupe Island, which lies ca. 250 km offshore surrounded by deep, cold water, fog is nearly perpetual during the growing season. Rain fall is erratic, fog drip provides most of the moisture to the soil and the trees. On the islands the species does not grow below 300 m and ascends to the summit ridges at 1,100 m a.s.l. on Guadalupe Island, but on the mainland it grows from sea level to the base of inland hills and does not exceed 400 m a.s.l. The island populations form pure stands with some undergrowth of Quercus tomentella (Guadalupe Island) or Juniperus californica (Cedros Island). On the mainland it forms pure stands or mixed stands with Cupressus macrocarpa, Pinus attenuata (both like P. radiata with serotinous cones adapted to fire), Arbutus menziesii, and Quercus agrifolia. In the absence of fire, Pseudotsuga menziesii establishes itself, especially in the southernmost population at Año Nuevo, and would become dominant to the exclusion of P. radiata. In stands with Cupressus macrocarpa there is very little or no undergrowth.|
|Major Threat(s):||Threats are (were) logging, feral goats, an introduced alien pathogen (pitch canker fungus), and competition from other trees in the absence of periodic fires.|
|Conservation Actions:||Legal protection and inclusion in protected areas are in place. Eradication of goats on Guadalupe Island has been undertaken. Fire management needs to be implemented in an ecologically responsible way. Research for immunity or resistance against pathogen needs to be undertaken.|
Anonymous. 1999. Fungus threatens pines worldwide. American Forests, Autumn 1999, p. 14.
Farjon, A. 2001. World Checklist and Bibliography of Conifers. 2nd edition. The Royal Botanic Gardens, Kew.
IUCN. 2013. IUCN Red List of Threatened Species (ver. 2013.1). Available at: http://www.iucnredlist.org. (Accessed: 12 June 2013).
|Citation:||Farjon, A. 2013. Pinus radiata. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 08 March 2014.|
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