Northern Mexico / SW USA

The negative impacts of residential and commercial development on conifers is so severe that it has led to conifer species becoming Critically Endangered. Ironically, the very system put in place to protect biodiversty, such as national parks, can have a negative impact on biodiversity. Here the most detrimental impacts can be from the visiting public by bringing an increased risk of fire and the introduction of harmful pests and diseases. As a result of an explosive growth rates in the human population over the last 50 years there has been a steady drift of people from the city centres into urban areas. It is estimated that 60% of the Earth's population will live in urban areas by 2030. Hence these increasing population densities and mounting development pressures are causing large tracks of land in the immediate surroundings of urban areas undergoing a process of what is known as urbanisation. This phenomenon directly alters forest ecosystems by removing or fragmenting forest cover. It indirectly alters forest ecosystems by modifying hydrology, altering nutrient cycling, modifying disturbance regimes, and changing atmospheric conditions. 

<em>Tetraclinis articulata</em>, Malta

Tetraclinis articulata, Malta© M.Gardner, RBGE

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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