Project goal: Use noninvasive survey methods to study Yosemite’s mountain lion population and collect key information for statewide species-conservation efforts.

Why this work matters: Mountain lions are considered a keystone species. In addition to controlling prey populations, such as deer, they influence the movements of other predators, including coyotes and bears. Throughout California, though, the wild natural landscapes on which mountain lions depend are disappearing.

With its more than 700,000 acres of wilderness, Yosemite could be a refuge for mountain lions. In order to protect the park’s Puma concolor population, though, scientists need to answer key questions about the species’ status: How many mountain lions live in Yosemite, and which parts of the park do they use?

In 2019, with support from our donors, researchers began a focused study of the park’s mountain lions. This year, the research team is continuing that work, using a combination of highly trained scat-detecting dogs, genetic analysis and remote cameras to gather clues that will help scientists identify individual lions, figure out their habitat preferences and, ultimately, estimate the overall population size.

How your support helps: Your donations will provide funding for the expert team and tools necessary to complete a second year of mountain lion survey work. With your support, researchers will gather data necessary not only to protect these wild felines and their habitats in Yosemite, but also to inform statewide mountain-lion management.

Partnering with California Department of Fish and Wildlife; Oregon State University; University of California, Davis; Integral Ecology Research Center; and Rogue Detection Teams.

Sarah Stock

Terrestrial Ecologist, Yosemite National Park

Project Notes

"In California, mountain lions are threatened by habitat fragmentation, development and changes in forest structure. Yosemite may provide an important wilderness refuge."