Northern Mexico / SW USA

Fires may be the result of natural phenomena such as lightning or they may be man-induced. Usually natural fires are an integral part of plant community development and influence such things as soil nutrient availability and biological diversity. In contrast, uncontrolled or wildfires disrupt such processes and can have a catastrophic impacts. The vast majority of wildfires are intentionally set and often occur in conifer forests. In recent years extended droughts, together with the rapidly expanding exploitation of tropical forests and the demand for the conversion of forests to other land uses, have resulted in a dramatic increase in wildfires. While some conifers have evolved to be fire dependent by having serotinous cones that open and release their seed in response to fire, their populations are so small or fragmented that even natural fires may be catastrophic. This is particularly evident in areas with a Mediterranean climate. It is the introduction of inappropriate fire regimes (frequency, severity, or seasonal timing) that can have the most severe impact.

Taxa in the category - Northern Mexico / SW USA :

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Abies hidalgensis Debreczy, Rácz & Guizar

Endemic to the State of Hidalgo in eastern Mexico where fire is a potential threat to the small population Read full species entry >

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Cupressus arizonica var. montana (Wiggins) Little

Endemic to Baja California in Mexico where the main threat is likely to be from an increase in the severity and frequency of fires due to fire suppression policies, coupled with the likely impacts of climate change. 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 arizonica var. stephensonii (C.B.Wolf) Little

Endemic to the US-Mexican border where fire is a major threat 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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Cupressus guadalupensis S.Watson

Endemic to Baja California, Mexico and the border area of California, USA. Threatened by fire and urbanisation. Read full species entry >

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