Spatial Ecology of Rock Rattlesnakes (Crotalus lepidus) in Far West Texas

Little is known about the ecology and behavior of Rock Rattlesnakes (Crotalus lepidus) despite the species' wide geographic distribution throughout the southwestern United States and central Mexico. The goal of this study was to quantify space use, movement patterns, and habitat use by C. lepidus in the Chihuahuan Desert of extreme west Texas. We used radiotelemetry to monitor subjects during at least one activity season from 2007 to 2010. Mean (±1 SE) home range size for all individuals was 13.69 ± 3.06 ha, and mean daily movement rate was 8.46 ± 1.45 m/d. Although monthly movement rates were similar, movement was greatest in September, corresponding with the peak of the mating season for C. lepidus at our study site. We used multinomial logit models to analyze habitat use patterns among telemetered snakes while controlling for subject, estimated habitat availability, and season. Our subjects were most often observed using small arroyos, despite these habitats being relatively limited spatially ...