Abstract
Thermal selection by collared lizards (Crotaphytus collaris) and chuckawallas (Sauromalus obesus) was studied in continuously operating laboratory thermal gradients in a 12L∶12D photoperiod in spring-summer. In both species, selected temperatures above the median were higher during the day than at night. Below the median selected temperature, however, nighttime temperature significantly exceeded daytime temperature in chuckawallas but not in collared lizards. Pinealectomized collared lizards selected significantly lower temperatures than sham-operated or intact controls. This effect was most pronounced at night. Pinealectomy had no effect on the temperatures selected by chuckawallas. The significance of these results is discussed in relation to the seasonal life-history strategy of these two species.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
