Phrynosoma systematics, comparative reproductive ecology, and conservation of a Texas native

by Hodges, Wendy Lea.

A survey to assess the status of the Texas horned lizard (Phrynosoma cornutum) in Texas was conducted in 1992. Museum specimen records were compiled to assess historical distribution and abundance, and 100 sites across the state with adequate historical records were selected to be surveyed for current presence and abundance of the species. Interviews were conducted with local residents concerning potential correlative factors to horned lizard occurrence, and an extensive database compiled from two sighting surveys distributed statewide was also used for the same purpose. Horned lizards, or evidence of their occurrence, were detected at 48 of the survey sites. These results are discussed in relation to current and historic land-use, pesticide use, and the invasion of the Red Imported Fire Ant (Solenopsis invicta). The future of the Texas horned lizard as a component of the natural heritage of the state is discussed. Phrynosoma cornutum serves as an excellent indicator of the general environmental health of terrestrial ecosystems in Texas. Key words: horned lizards; Phrynosoma cornutum; conservatio*n; fire ants; surveys; Texas. *Portions of this chapter were published Donaldson, W.L., A. H. Price, and J. Morse. The Current Status and Future Prospects of the Texas Horned Lizard (Phrynosoma cornutum) in Texas. Texas Journal of Science, May 1994, Vol. 46(2): 97-113. 102