Energetics of the Rusty Lizard Sceloporus Olivaceus
1975
Dutton, Ronald H. | Fitzpatrick, Lloyd C. | Hughes, John L.
Rates and energy equivalents of consumption (C), egestion + excretion (FU), assimilation (A), respiration (R) and production (P) were measured in two groups of Sceloporus olivaceus: (1) a laboratory group acclimated at five seasonally encountered temperatures (15°, 20°, 25°, 30° and 35°C); and (2) four acclimatization groups collected at different seasons when ambient temperatures corresponded to 15°, 20°, 25°, and 30°. Weight—specific rates and energy equivalents of C, FU, A, R and P were significantly influenced by temperature, and in general, showed inverse exponential relationships with body weight. Although there were no significant differences in R between ♂ ♂ and nongravid ♀ ♀, gravid ♀ ♀ had rates that were 17.4% higher. Weight—specific rates of C, FU, A, R, and P were adjusted for patterns of metabolic compensation to seasonally encountered ambient temperatures, body temperatures, weather conditions, and number of hours lizards were active during the year, and were used to calculate the annual energy budget of a typical 16.49—g, 1—yr—old lizard; C = 262.3 kcal (1,098 kJ), FU = 43.3 kcal (181.2 kJ), A = 218.0 kcal (912.5 kJ), R = 98.5 kcal (412.3 kJ), and P = 119.5 kcal (500.2 kJ). The annual apportionment of A between R and P was also calculated by assuming that rates of active lizards are 2, 2.5 and 3 x their laboratory metabolic rates.
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