Meeting Abstract
The historical range of the Texas Horned Lizard (THL, Phrynosoma cornutum) spans across most of Texas, all of Oklahoma, parts of Kansas and New Mexico, and most of northern and central Mexico. However, the species has experienced range contraction and population declines throughout much of the range. There is no substantial evidence to indicate any one cause, so it is likely that the decline has been triggered by multiple factors. Possible threats include Red Imported Fire Ants (Solenopsis invicta), herbicides and pesticides, habitat destruction and disturbance, and collection. Further investigation is needed to fully understand the threats these iconic lizards face, and state natural resource agencies such as the Texas Parks and Wildlife Department are studying reintroduction techniques to reestablish extirpated populations. In addition, the habitat description given by many is vague, such as that from Burrow et al. (2001): “a mosaic of bare ground, herbaceous vegetation, and woody vegetation in close proximity.” Research using radio transmitters to track individuals can provide more accurate data and thorough knowledge of habitat use. The purpose of this study is to investigate the factors influencing THL dispersal, survival, and habitat selection following reintroduction. As part of an ongoing project at Mason Mountain Wildlife Management Area, near Mason, Texas, a total of 1,351 points were collected from 22 reintroduced lizards using radiotelemetry from May to August 2016. Data was collected on habitat variables of these points and randomly located points. Harvester Ant (Pogonomyrmex or Ephebomyrmex) locations were recorded within the study area. Future analysis of the data will provide insight on proper techniques to successfully reestablish extirpated populations of THL across Texas.
