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The loss of large predators like wolves and a resulting rise in populations of moose, deer and other herbivores is disrupting ecosystems, U.S. researchers say.
The global decline of apex predators, such as wolves, lions and sharks, has led to a destructive surge in smaller mesopredators, scientists in Oregon said.
Introducing wolves to a test site in Scotland would establish a model for controlling the over-population of red deer, scientists in Oregon said.
More large predators such as cougars are needed in wild lands in the western United States to enhance overall wildlife populations, two scientists say.
Scientists said the disappearance of cougars from Yosemite National Park in the 20th century disrupted the entire ecology of the valley.
U.S. researchers said the return of wolves to Yellowstone National Park has allowed aspen trees to grow there for the first time in decades.
A series by UPI examining the relationship of humans to the environment. This week: Despite its longstanding bad reputation, wolves can work some wonders on local ecosystems.
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United Press International
United Press International
