Spatial ecology of the Texas Alligator Lizard (Gerrhonotus infernalis) in Blanco County, Texas

Authors: Corey M. Fielder, Wade A. Ryberg, Danielle K. Walkup, Jared M. Holmes, Toby J. Hibbitts

Texas Alligator Lizards (Gerrhonotus infernalis) range from Central Texas into adjacent northeastern Mexico, and published ecological studies on their terrestrial and arboreal movement patterns are lacking. We used radiotelemetry to assess movements, annual home range, and arboreal activity of G. infernalis at Bamberger Ranch Preserve, Blanco County, Texas, to provide baseline ecological data for populations occurring in the northernmost extent of the species’ range. Movement patterns were influenced by temporal (e.g., seasonal) and behavioral cues (e.g., breeding period), but generally no differences were observed between sexes. Annual home range varied, but males averaged larger 95% MCP (minimum convex polygon) annual home ranges, while females averaged larger 50% MCP core use areas, although we were unable to test for differences due to low sample sizes. Males and females exhibited similar arboreal trends, but arboreal activity did vary by season and diurnal period. Most arboreal activity occurred during the summer and late spring, with less during the fall and winter months. Gerrhonotus infernalis, on average, inhabited higher perch sites during the evening and morning diurnal periods and lower perch sites during the afternoon periods. These findings provide novel insights into the ecology of G. infernalis in Central Texas and will aid in future management activities.

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