College of Forestry

Global Trophic Cascades Program

How humans, vanishing cougars changed Yosemite

San Francisco Chronicle May 2, 2008: "The loss of top predators, whether it's wolves in Yellowstone or cougars in Yosemite, is having a severe and degrading impact on plant communities," says William Ripple of Oregon State's department of forest resources, the lead author of a report published online in the journal Biological Conservation.