Thermal Biology of the Northern Alligator Lizard (Elgaria coerulea): A Laboratory Study
Document Type
Oral Presentation
Campus where you would like to present
SURC 140
Start Date
17-5-2012
End Date
17-5-2012
Abstract
Many reptiles are known to regulate body temperature, but little is known about the thermal biology of the Northern Alligator lizard E. coerulea, which inhabits the Pacific Northwest. I used a thermal gradient to explore the following questions: 1) when given a diversity of temperature options, do Northern Alligator lizards show a specific temperature preference? If so, what is their “preferred” body temperature? 2) Does their body temperature preference change after feeding? And 3) does any tendency to either avoid other lizards, or group-up with other individuals, influence body temperatures of Alligator lizards in a thermal gradient. To address these hypotheses, I divided an ectothermatron (large cage, set up as a temperature gradient) into different temperature regions: one end at 15o C, the middle 25o C, and the other end 35o C. I placed six hideboxs in these regions and observed where lizards spent the most time. I conducted trials on 10 lizards over 4 months. For the “feeding treatment,” data were recorded up to 2 days after eating (meal size ~20 crickets); and 7 days post feeding for the “unfed treatment.” Lizards seemed to prefer intermediate temperatures (mean for all lizards Tb =25.2 ±2.91) but showed no differences in body temperatures before feeding (Tb =25.6±2.93) than after feeding (Tb=24.8±2.87). After feeding, however, lizards seemed to allow less variation in environmental temperature. Preliminary results suggest that lizards chose hide boxes independently of the presence of other lizards.
Recommended Citation
Butterfield, Taggert and Beck, Daniel, "Thermal Biology of the Northern Alligator Lizard (Elgaria coerulea): A Laboratory Study" (2012). Symposium Of University Research and Creative Expression (SOURCE). 135.
https://digitalcommons.cwu.edu/source/2012/oralpresentations/135
Additional Mentoring Department
Biological Sciences
Thermal Biology of the Northern Alligator Lizard (Elgaria coerulea): A Laboratory Study
SURC 140
Many reptiles are known to regulate body temperature, but little is known about the thermal biology of the Northern Alligator lizard E. coerulea, which inhabits the Pacific Northwest. I used a thermal gradient to explore the following questions: 1) when given a diversity of temperature options, do Northern Alligator lizards show a specific temperature preference? If so, what is their “preferred” body temperature? 2) Does their body temperature preference change after feeding? And 3) does any tendency to either avoid other lizards, or group-up with other individuals, influence body temperatures of Alligator lizards in a thermal gradient. To address these hypotheses, I divided an ectothermatron (large cage, set up as a temperature gradient) into different temperature regions: one end at 15o C, the middle 25o C, and the other end 35o C. I placed six hideboxs in these regions and observed where lizards spent the most time. I conducted trials on 10 lizards over 4 months. For the “feeding treatment,” data were recorded up to 2 days after eating (meal size ~20 crickets); and 7 days post feeding for the “unfed treatment.” Lizards seemed to prefer intermediate temperatures (mean for all lizards Tb =25.2 ±2.91) but showed no differences in body temperatures before feeding (Tb =25.6±2.93) than after feeding (Tb=24.8±2.87). After feeding, however, lizards seemed to allow less variation in environmental temperature. Preliminary results suggest that lizards chose hide boxes independently of the presence of other lizards.
Faculty Mentor(s)
Daniel Beck