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The average daily metabolic rate (ADM'R), resting metabolic rate (RMR), rhythm and sum of daily activity, as well as consumption and food utilization were investigated in the snow vole, Microtus nivalis (N=46), captured in Tatra Mountains (1400 to 1480 m above sea level). The ADMR of M. nivalis at 15°C amounts to 3.82. and at 20°C to 3.56 cc 0,/g. hr. The relationship between ADMR and body weight is described by the equations: for 15°C ADMR cc O 0 /g hr=8.58 W-°-237 , and at 20°C ADMR cc 0,/g h=8.75 W-°- 284 The thermoneutral zone for snow vole is around 20°C. At this temperature RMR is equal to 6.33 kcal/kg°-75 hr, and increases by 113.9% at -10°C. The efficiency of thermoregulation in this range amounts to 3.8°/o/°C. The temperature of vole's body depends to some extend on ambient temperature: in the range of 10 to 20°C it is constant and equal to 38.1°C but falls to 32.7 at -5°C. The sum of daily activity amounts to 8.9 hours. The rhythm of activity shows a biphasic 29.25 kcal in the form of dried fruits of Vaccinium myrtillus; consumption of leaved stems is higher by 22.7%>. The daily energy budget (DEB) calculated for summer and winter is almost identical and amounts to: DEB (kcal/g day) = 1.25 W-°- 264 . During a day the vole weighing 33 g dissipates 16.4 kcal, or 0.497 kcal/g, on the average.

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