PREDATOR-PREY SPATIOTEMPORAL DYNAMICS IN RESTORED CORRIDORS FOR THE ENDANGERED SAN BERNARDINO KANGAROO RAT

Paige C. Miller; San Diego Zoo Wildlife Alliance; pmiller@sdzwa.org; Rachel Y. Chock, Debra M. Shier

Habitat loss and fragmentation threaten the endangered San Bernardino kangaroo rat (Dipodomys merriami parvus; SBKR), a nocturnal rodent restricted to open alluvial fan sage scrub habitats in southern California. Wildlife corridors are commonly used to restore habitat connectivity for small mammals, yet they may also facilitate predator movement, potentially increasing encounter rates and heightening localized predation risk. Because kangaroo rats are key prey for multiple species, identifying corridor designs that promote dispersal without increasing predation risk is critical for recovery. In collaboration with landowners, we experimentally restored linear corridors and stepping-stone patches to connect SBKR populations to restored habitat using surface scraping, sediment addition, and herbicide treatments. We continuously monitored wildlife activity using infrared cameras over more than a year. We compared predator and prey detections, diel activity patterns, and spatial overlap of SBKR and their predators across corridor and control areas. Our findings reveal how predators and prey partition space and time within restored landscapes, informing design principles that balance connectivity benefits with predation risk in recovery planning for SBKR and other small mammals.

Ecology and Conservation of Small Mammals 
Thursday 8:45 AM