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Threats to biodiversity rise in the world's Mediterranean-climate regions
Date:2/17/2009

s (5,480 square kilometers), an area about half the size of the nation of Lebanon. The greatest increase in urban area was in California, USA and Baja California, Mexico. Loss of natural habitat to agriculture was greatest in southwest Australia.

Underwood said that urban expansion is worrisome in that it is not only impacting lowlands, which have been the historic urban centers, but is spreading into intact foothills, especially those within commutable distances to major cities. For example, this trend is seen in California's Sierra Nevada foothills and the Sierra de Guadarrama region near Madrid in Spain.

The researchers also analyzed the relationship between these threats and the number of at-risk plants and animals. For example, they found that numbers of threatened plant and mammal species increased as the size of the urban footprint and population density grew. These findings indicate the need to accelerate conservation action to outpace threats in the mediterranean biome. "This information can help support decisions about how best to invest scarce conservation resources," says co-author Kirk Klausmeyer, a scientist with The Nature Conservancy.


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Contact: Davina Quarterman
dquarterman@wiley.com
Wiley-Blackwell
Source:Eurekalert

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