[PCA] NEWS: In a Warmer Yellowstone Park, a Shifting Environmental Balance

[Olivia Kwong]

http://www.nytimes.com/2008/03/18/science/18griz.html

In a Warmer Yellowstone Park, a Shifting Environmental Balance
By JIM ROBBINS
Published: March 18, 2008

YELLOWSTONE NATIONAL PARK, Wyo. -- The grassy sweep of the Lamar Valley in 
the northeastern corner of this park is famous for its wildlife, 
especially its vast herds of elk and bison and the wolves that hunt them.

But while walking across the Lamar last fall, Robert L. Crabtree, chief 
scientist with the Yellowstone Ecological Research Center in Bozeman, 
Mont., pointed out a cascade of ecological changes under way. The number 
of grizzly bears and gophers in the valley has increased, Dr. Crabtree 
said, an increase supported by the spread of an invasive plant from the 
Mediterranean that a warming climate benefits.

See the link above for the full article text.