Abstract
Abstract o 1. One limb was exposed to room temperature (22±2°C) while the contralateral limb was cooled to 0±1°C. 2. Noncontrol individuals were acclimated at 5±1°C for periods up to 28 days. 3. Control animals responded to the cooling regimen (25-0°C at 0.5C/min) in a “poikilothermic” manner indicating local cold induced vasoconstriction (CIVC) was released when toepad temperatures reached 28.5±1.9°C. 4. At this point, a transient cold induced vasodilation (CIVD) occurred. 5. After 28 days at 5°C, limb exposure to 0°C resulted in a more gradual decline in toepad temperature. 6. This was indicative of an increased resistence to peripheral heterothermy as mediated by CIVD and initiated at 31.1±1.3°C. 7. Animals maintained outdoors at 2±2°C with ample nest material exhibited responses intermediate to the experimental extremes. 8. CIVC were initiated at 29.8±0.7°C while toepad temperatures declined at a rate intermediate to non-acclimated controls and the 28-day acclimation group. 9. This data suggests the essential adaptative characteristics of peripheral heterothermy in this species.
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