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Effect of environmental temperature on body temperature and metabolic heat production in a heterothermic rodent, Spermophilus tereticaudus

K. Mark Wooden^* and Glenn E. Walsberg

Department of Biology, Arizona State University, Tempe, AZ 85287-1501, USA

View larger version (19K): [in a new window]   Fig. 1. Body temperature as a function of air temperature (1 h exposure). Also shown are the body temperature range of typical rodents and a line of equality (dashed). Values are means ± S.E.M. (N=11).

View larger version (16K): [in a new window]   Fig. 2. Metabolic heat production as a function of air temperature (1 h exposure). Also shown is the estimated metabolic heat production as calculated from equation 1, setting C=0.14 W°C-1 and TB=37°C. Values are means ± S.E.M. (N=11).

View larger version (14K): [in a new window]   Fig. 3. Body temperature as a function of air temperature (8 h exposure). Also shown are the minimum and maximum body temperatures maintained within 0.2°C for at least 1 h and the average body temperature over 8 h. Values are means ± S.E.M. (N=9).

View larger version (20K): [in a new window]   Fig. 4. Metabolic heat production as a function of air temperature (8 h exposure). Minimum and maximum values are those measured 30 min into the periods in which the reported minimum and maximum body temperatures occurred. Average values are body temperatures averaged over the entire 8 h period. Also shown is the estimated metabolic heat production as calculated from equation 1, setting C=0.14 W°C-1 and TB=37°C. Values are means ± S.E.M. (N=9).