AbstractWe used radio telemetry to track the daily movements of Cambarus chasmodactylus (New River Crayfish) in Anthony Creek, West Virginia, to help us better understand the daily activity and habitat preferences of cambarid crayfish. We fitted ten 0.8-g transmitters to the chelae of C. chasmodactylus (6 form I males/3 form II males/1 female) and released them at their initial point of capture. We tracked animals for 5 consecutive days, after which we initiated a 20-d noninteraction period followed by 6 more days of tracking. After locating an individual, we noted water depth, current velocity, and substrate type at the individual’s position and recorded distance traveled over the previous 24 h. The ephemeral home range concept applied to most movement patterns, a result indicating that individual C. chasmodactylus have multiple home ranges over the course of their lives. Beginning in July, form I males maintained more permanent territories under slab boulders, a behavior theorized to be mediated by repr...