Northern Mexico / SW USA

Most of the world’s volcanic eruptions occur around the Pacific rim -  a horseshoe shape of nearly continuous series of volcanic arcs. Here over 75% of the world’s volcanoes occur hence the name ‘The Ring of Fire’ or as it is technically referred to the circum-Pacific seismic belt.  It is around the Pacific Rim, often on the slopes of volcanoes where important conifer habitats occur.  Frequently these contain small populations of narrow endemics. Although active volcanoes contribute to a very small percentage of the total forest habitat loss, it can be significant if the volcano is in a protected area (as is often the case) and this sanctuary represents a significant part of the distribution of a conifer species. When humans put pressure on species and ecosystems, the effects of natural events such as volcanoes can be more detrimental than they would otherwise be and should be considered real threats in some situations.

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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