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Many lizard species use lateral compressions of the body during agonistic encounters. I investigated the signal value of the frequency at which these displays are presented and how that rate is affected by familiarity and threat. The... more
Many lizard species use lateral compressions of the body during agonistic encounters. I investigated the signal value of the frequency at which these displays are presented and how that rate is affected by familiarity and threat. The response of resident collared lizards ( Crotaphytus collaris) to tethered strangers, neighbors on the correct boundary, and neighbors displaced to the opposite boundary,
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Research Interests: Physiology, Zoology, Reproduction, Seasonality, Reptile, and 17 moreProgesterone, Testosterone, General, Female, Animals, Corticosterone, Male, Museum Collection, Seasonal variation, Crotalus, Reproductive cycle, Reproductive behavior, Veterinary Sciences, Mating Behavior, Estradiol, Dihydrotestosterone, and Radioimmunoassay
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... Our study site was located at San Angelo State Park (31?31'N, 100?33'W) in Tom Green Co., Texas and included ... associated with pecan (Carya illinoensis) dominated ripar-ian woodlands along 3 waterways, the North... more
... Our study site was located at San Angelo State Park (31?31'N, 100?33'W) in Tom Green Co., Texas and included ... associated with pecan (Carya illinoensis) dominated ripar-ian woodlands along 3 waterways, the North Concho River, Bald Eagle Creek, and Little Foot Draw (see ...
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Locomotor ability is well-documented to decrease in gravid female lizards. However, no studies have examined what proportion of maximal sprint speed capacity gravid females use in nature or how a reduction in maximal capacity translates... more
Locomotor ability is well-documented to decrease in gravid female lizards. However, no studies have examined what proportion of maximal sprint speed capacity gravid females use in nature or how a reduction in maximal capacity translates to changes in sprint speeds used in nature. Gravid females may com- pensate for reduced locomotor ability by increasing the proportion of their maximal capacity used in nature, or by changing their antipredator behaviour. I measured maximal sprint speed in the laboratory for female col- lared lizards (Crotaphytus collaris) while gravid and nongravid and then compared those to speeds used in the Weld while foraging and escaping predators, and also while gravid and nongravid. Females had signiW- cantly lower maximal sprint speed capacity while gravid, and they ran slower while foraging and escap- ing predators. However, gravid females did not increase the proportion of maximal capacity used in those contexts compared to when not gravid. Gravid females ...
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... Our study site was located at San Angelo State Park (31?31'N, 100?33'W) in Tom Green Co., Texas and included ... associated with pecan (Carya illinoensis) dominated ripar-ian woodlands along 3 waterways, the North... more
... Our study site was located at San Angelo State Park (31?31'N, 100?33'W) in Tom Green Co., Texas and included ... associated with pecan (Carya illinoensis) dominated ripar-ian woodlands along 3 waterways, the North Concho River, Bald Eagle Creek, and Little Foot Draw (see ...