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:

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Athrotaxis cupressoides D.Don

Endemic to Tasmania where the main threats are fire, grazing of regeneration and dieback caused by Phytophthora Read full species entry >

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Callitris oblonga A.Rich. & Rich.

Endemic to Australia where it occurs on the mainland and Tasmania. Threats include  forest clearance, fire, grazing, invasive species and soil erosion. Read full species entry >

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Cedrus libani A.Rich.

Native to mountains adjacent to the north-eastern Mediterranean coast in Turkey, Syria and Lebanon. Threats include pathogens, fire, urbanisation, selective felling, activities associated with winter sports and grazing. Read full species entry >

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Cupressus arizonica var. nevadensis (Abrams) Little

Endemic to the USA in southern California and threatened mainly by fire Read full species entry >

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Cupressus bakeri Jepson

Known from nine sites in northern California and south Oregon where fire and the introduction of pests and diseases are major threats Read full species entry >

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Cupressus goveniana Gordon

Endemic to California, USA where it is facing a range of threats including changes to fire regimes, urbanisation, invasive non-native plants and agriculture. Read full species entry >

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Cupressus goveniana var. abramsiana (C.B.Wolf) Little

Endemic to California, USA where fire and urbanisation are the mian threats Read full species entry >

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Cupressus goveniana var. goveniana

Endemic to California, USA where altered fire regimes and ubanisation are the main threats Read full species entry >

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