Invasive species

Conifers which become stressed following habitat disturbance are often out-competed by better adapted native plant species.  For example, in Bosnia and Herzegovina regeneration in some populations of Picea omorika is being supressed by native Fagus sylvatica because of being better adapted to colonising disturbed forest areas. In Western USA fire-supression has reduced the ability of Cupressus bakeri (which is fire-dependent) to regenerate, hence it is gradually being replaced by Abies magnifica and A. concolor.  Native mistletoes species of the genera Arceuthobium, Phoradendron and Psittacanthus can have a deterimental affect on conifers in North America and Mexico. These shrubby, aerial parasites, which are bird dispersed or have explosive fruits, cause deformation of the infected stems, growth loss, increased susceptibility to other disease agents or insects, and reduced longevity. Species of Abies, Cupressus and Juniperus are particularly susceptable to infestation especially if stressed by habitat disturbance.

Taxa in the category - Invasive species:

Page 5 of 6 pages ‹ First  < 3 4 5 6 > 
 world map

blob indicating China on map

Pinus squamata X.W. Li

One of the world's rarest pines, confined to a single locality in Yunnan, China with only about 20 mature individuals. Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus torreyana Parry ex Carrière

Distributed in California, USA with two subspecies, one on the mainland and one on Santa Rosa Island. Both have very restricted distributions and small population sizes. On the mainland, outside of the main protected area of Torrey Pines State Park it is threatened by urbanisation. Read full species entry >

 world map

blob indicating Northern Mexico / SW USA	 on map

Pinus torreyana subsp. insularis J.R.Haller

A very small population found on Santa Rosa Island in California, USA where potential threats include pests and diseases and fire. Read full species entry >

 world map

blob indicating Caribbean on map

Podocarpus urbanii Pilg.

Endemic to Jamaica where it is threatened by illegal logging, wood harvesting and the proliferation of invasive non-native species. Read full species entry >

 world map

blob indicating China on map

Pseudolarix amabilis (J. Nelson) Rehder

Has a restricted distribution in China within the Yangtse Valley due to loss of habitat Read full species entry >

 world map

blob indicating China on map

Thuja sutchuenensis Franchet

Represented by a single population in Southwest China where up until 1990 it was thought to be extinct; mainly as a result of  selective logging. Read full species entry >

 world map

blob indicating Eastern and southeastern USA	 on map

Torreya taxifolia Arn.

Restricted to a very small area in Florida and Georgia, USA where its dwindling population faces a number of threats, the most serious of which is a canker disease caused by Fusarium torreyae.  Read full species entry >

 world map

blob indicating Southern Africa and Madagascar on map

Widdringtonia cedarbergensis J.A.Marsh

Endemic to South Africa where historical exploitation for its valuable timber and more recently fire have greatly reduced the population Read full species entry >

Page 5 of 6 pages ‹ First  < 3 4 5 6 >