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. Research Finds Urban Sprawl Not So Bad For Wildlife

Tree plantations have nearly doubled in acreage in the U.S. over the last 15 years to nearly 45 million acres, due in large part to government policies encouraging such land use.
by Staff Writers
Sewanee TN (SPX) Jan 11, 2007
Urban sprawl might not be as harmful to wildlife as previously thought, according to a new study by researchers from the Landscape Analysis Lab at Sewanee: The University of the South in Tennessee. Using field surveys and digital maps of habitat, David Haskell and Jonathan Evans, both biology professors at Sewanee and Neil Pelkey, an environmental science professor at Juniata College in Huntingdon, Pa., compared the diversity of bird populations in natural forests, tree plantations and "exurban" (urban sprawl) areas along the Cumberland Plateau in Tennessee.

They found that tree plantations had substantially less bird population diversity than did native forests and exurban areas. In some cases, exurban areas had more diversity than did the native forests.

"These findings suggest that urban sprawl is not all bad for wildlife," Haskell says. "This turns conventional wisdom about wildlife conservation on its head."

For years scientists have been concerned with the loss of biodiversity resulting from worldwide deforestation. Governments and private organizations have implemented conservation programs that discourage sprawl and promote tree plantations to replace deforested areas.

"Scientists had assumed that tree plantations were preferable to exurban areas for wildlife conservation," Haskell says. "This study firmly refutes this assumption, and has important implications for government policies, many of which subsidize plantations and penalize sprawl in the name of wildlife conservation."

For estimates of forest cover, the U.S. government classifies forest converted to tree plantation as "no loss of forest", and classifies wooded areas where houses have been built as "loss of forest."

"Yet our data show that plantations have much lower levels of biodiversity than do native forests and that exurban areas can retain much of the biodiversity of native forests," the researchers write. "Therefore, current methods of accounting for forests give potentially misleading results for biodiversity analyses."

Haskell says that tree plantations have nearly doubled in acreage in the U.S. over the last 15 years to nearly 45 million acres, due in large part to government policies encouraging such land use.

The researchers believe that extensive chemical and mechanical land clearing techniques used to prepare land for tree plantation, along with the fact that most plantations contain only a single type of tree, result in poor nesting habitats for many types of birds. Exurban areas on the other hand have a mix of forest, ornamental shrubbery, lawns and other structures that provide diverse nesting opportunities for a wide variety of bird species.

Related Links
University of the South in Tennessee
Darwin Today At TerraDaily.com

Confused By Warm Winter Swedish Bears Hibernate Two Months Late
Stockholm (AFP) Jan 09, 2007
Brown bears at one of Sweden's most popular safari parks, confused by an exceptionally mild winter, have finally gone into hibernation more than two months late despite unseasonally high temperatures, the park said on Tuesday. "They're all asleep now ... although we have not yet had any ground frost, the lack of daylight means they are not as active as they are in spring and summer," Kolmaarden Safari Park curator Lennart Sunden told AFP.

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