What impact do mountain lions have on local ecosystems?

Prey Regulation

Mountain lions are apex predators that primarily feed on large ungulates such as deer and elk. Studies have shown that their predation pressure can reduce prey populations by up to 50% in areas with high mountain lion density. This, in turn, can lead to increased growth rates in remaining prey populations, as they have reduced competition for food and resources.

Ecosystem Engineering

Mountain lions also contribute to ecosystem engineering through their digging and denning activities. They excavate dens in rocky outcroppings and tree cavities, which can become important habitat features for other animals. For example, a study in Colorado found that mountain lion dens were used by 17 different species of animals, including hawks, owls, and squirrels.

Biodiversity and Community Composition

In areas with high mountain lion populations, the community composition of animals can shift in response to the predator’s presence. For example, a study in Arizona found that areas with high mountain lion density had lower populations of species that are vulnerable to predation, such as mule deer fawns. However, they had higher populations of species that are more resilient to predation, such as adult mule deer and coyotes.