Temperature regulation of the little brown bat, Myotis lucifugus after acclimation at various ambient temperatures

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Department of Biological Sciences


1. 1. The effect of temperature acclimation on the thermoregulatorymetabolic adjustments of the little brown bat (Myotis lucifugus) was investigated. 2. 2. Regardless of the season of capture, bats acclimated at 10°, 20°, or 30°C showed three significantly different (P < 0·05 level) metabolic rate patterns when exposed to cold. An increased metabolic rate and ability to maintain a body temperature of 30°C or above was inversely related to the temperature at which bats were acclimated. Thermoregulation was apparently incomplete inasmuch as Newton's Law of Cooling was not applicable to these data. 3. 3. Earlier reports suggest that the thermoregulatory pattern for summer-and winter-captured bats resembles that for the warm and cold-temperature acclimated bats in this study. 4. 4. The thermoregulatory-metabolic patterns for each of the three groups of acclimated bats, including such homeothermic-like features as thermal neutrality, standard metabolic rate, maximum metabolic rate, and body temperature were described, and found to be in general agreement with information reported for other similar-sized acclimated mammals.

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Comparative Biochemistry and Physiology -- Part A: Physiology