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Global survey of urban birds and plants find more diversity than expected
Date:3/11/2014

AMHERST, Mass. The largest analysis to date of the effect of urbanization on bird and plant species diversity worldwide confirms that while human influences such as land cover are more important drivers of species diversity in cities than geography or climate, many cities retain high numbers of native species and are far from barren environments.

Urban ecologist Paige Warren of the University of Massachusetts Amherst, co-leader of a 24-member research working group at the University of California Santa Barbara's National Center for Ecological Analysis and Synthesis (NCEAS), and colleagues reported their findings recently in Proceedings of the Royal Society B.

"We were able to build the largest database to date from the largest number of cities, more than 140 on every continent except Antarctica," Warren says. "So it's a more global survey than past studies, which have focused mainly on North America and Europe. For the first time, we were able to include cities in South America, in the tropics and in developing countries. This gives us more confidence in our generalizations about what is going on."

"Looking at what drives the number of species found, we see that human factors are more influential than region or where the city is located, for example," she adds. The researchers wrote, "Not surprisingly, greater proportions of intact vegetation in cities, as found in older cities, preserve plant species. These results highlight the importance of including remnant vegetation and restoring natural areas in the design of cities."

Thus, the study underlines the value of urban green space as refuges for native species and migrating birds, Warren says. Conserving green spaces, restoring native plant species and adding habitats that promote biodiversity in cities can support more bird and plant species.

Working group members compiled the global dataset for birds in 54 cities and for plants in 110 cities. The m
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Contact: Janet Lathrop
jlathrop@admin.umass.edu
413-545-0444
University of Massachusetts at Amherst
Source:Eurekalert  

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