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E. Studying Climate Change at Yellowstone National Park

Narrator: This is Science Today. Researchers at the University of California, Berkeley are trying to understand how climate change is affecting the ecosystem of Yellowstone National Park. Environmental Scientist Chris Wilmers, who led the study, says in the last 55 years, Yellowstone's climate has changed.

Wilmers: Climate has been changing, mostly due to warming, and the effect of that is winters are getting shorter, as measured by the number of days with snow on the ground.

Narrator: Shorter winters and the reintroduction of gray wolves at Yellowstone in 1995, has changed how scavengers like coyotes, eagles and ravens search for food during winter months.

Wilmers: With wolves in the system, because the availability of carrion is less dependent on winter conditions, and more on wolves, wolves sort of buffer the effect of climate change on these scavengers during the winter time. 10:33 And so now we're trying to understand, how climate will continue to change in the future, and how that's likely to impact the system.

Narrator: For Science Today, I'm Larissa Branin.