Movement and Home Range of the Coahuila Box Turtle (Terrapene coahuila) in the Cuatro Ciénegas Valley, Mexico

Turtle movement patterns are influenced by foraging, searching for mates, shelter, and thermoregulating. Movements can be influenced by intrinsic characteristics of the organisms, such as sex and age, but also by extrinsic factors such as seasonal changes, availability of food, and the need to find microhabitats for long inactive periods such as estivation and brumation. Terrapene coahuila (Coahuila Box Turtle) is the only aquatic species of Terrapene and inhabits the wetlands of Cuatro Ciénegas, Coahuila, in northern Mexico. This study describes the movement patterns and the home range of adult Coahuila Box Turtles, and the influence of pronounced seasonality in the wetland system of the Cuatro Ciénegas Valley on the species' behavioral ecology. The average daily linear distances traveled by adults during the wet–warm, wet–cold, and dry–warm seasons were 36.76, 21.38, and 32.18 m, respectively. The daily distance travelled was not statistically different between males and females or among seasons. The average number of movements was affected by seasonal conditions, with a marked reduction in the wet–cold season. The average home ranges for wet–warm, wet–cold, and dry–warm seasons were 0.91, 0.60, and 0.25 ha, respectively, using the fixed kernel method (FK), and 4.68, 1.48, and 5.09 ha, respectively, using the minimum convex polygon method (MCP). There were no significant differences in home-range size between sexes or among seasons using FK but there were using MCP (the latter being smaller during the wet–cold season). Seasonal differences in movement patterns may reflect seasonal changes in the habitat as well as other landscape attributes that might be involved in the spatial ecology of the species.