Abstract
Metabolic expenditure of Cnemidophorus murinus (Sauria: Teiidae) was measured in animals walking on a motor-driven treadmill and compared to measurements of resting and maximal oxygen consumption. At normal field-foraging velocity (0.14 km/h), metabolic rate is approximately 4 times resting values: 0.89 vs. 0.23 cc O2/(g h). Maximal levels of oxygen consumption [1.6 cc O2/(g h)] are attained at 0.3 km/h, the greatest speed which can be sustained for over 30 min. Animals exhaust rapidly at 0.5 km/h. The ability of this lizard to sustain aerobic activity is limited, but foraging activity is restricted within these aerobically supportable limits. Foraging is energetically expensive and constitutes approximately 87% of the metabolic expenditure during diurnal activity and 71% of the total daily expenditure for this animal.
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