03 Jan '12, 3pm

Return of wolves has helped ecosystem recovery in Yellowstone National Park #wolves #yellowstone

03 Jan 2012: Return of Wolves Has Helped Ecosystem Recovery in Yellowstone Park The return of wolves to Yellowstone National Park has caused significant ecosystem recovery by curbing populations of elk that for decades had over-browsed young aspen and willow trees, according to a new U.S. Fish & Wildlife study. In an analysis conducted by Oregon State University , researchers found that tree stands and shrubs have recovered along some streams, improving habitat for beaver and fish and providing more food sources for birds and bears. In the 15 years since wolves were reintroduced to Yellowstone after being killed off last century, northern elk populations have decreased from more than 15,000 in the early 1990s to about 6,000 last year, according to the study published in the journal Biological Conservation . By 2006, some aspen trees had grown tall enough that they were no ...

Full article: http://e360.yale.edu/digest/return_of_wolves_has_helped_e...

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