In late 2015 we initiated a study to examine the movements and food habits of mountain lions in northeastern California. As part of our ongoing study of the ecology of pronghorn in that region of California, we discovered that a high percentage of the mortality of adult pronghorn was caused by predation by mountain lions. Because pronghorn usually occupy open sagebrush steppe habitat, biologists were surprised to learn that an ambush hunter like mountain lions could successfully prey upon pronghorn.
It is thought that the changing vegetation structure on the Modoc Plateau (Modoc and Lassen Counties) may be contributing to the increased ability of mountain lions to prey upon pronghorn. Woodland habitat, made up primarily by encroaching juniper forest, has decreased the more open habitat historically characteristic of the plateau, and perhaps provided greater opportunities for mountain lions to get close enough to pronghorn to make successful attacks.
This investigation is being done in cooperation with the UC Davis Wildlife Health Center and the California Department of Fish and Wildlife.