Note a — Front matter

Meas is measured basal metabolism (mL O2·g-1·h-1). Hbr is the ratio of measured to predicted basal metabolism where the predicted value is calculated from Ḣb = 3.42·m-.25 (Kleiber, 1932, 1961:206) and m is body mass in grams. [b] Meas is measured minimum thermal conductance (mL O2·g-1·h-1·°C-1). Cmwr is the ratio of measured to predicted minimum thermal conductance where the predicted value is calculated from Cm = 1.0·m-0.5 (McNab and Morrison, 1963; Herreid and Kessel, 1967), and m is body mass in grams. [c] Tb is body temperature during the active (α) and rest (ρ) phases of the daily cycle (°C). [d] Tn is the thermoneutral zone as defined by the lower (Tlc) and upper (Tuc) critical temperatures (°C). [e] Conductance calculated as the slope of the line describing oxygen consumption at temperatures below the lower critical temperature. [f] Conductance calculated from Cmw = Ḣr/(Tb - Ta), where Ḣr is resting metabolic rate at temperatures below Tlc, and other symbols are as described elsewhere. [g] Inactive-phase thermal conductance: estimated from Scholander et al. (1950b), assuming that active-phase thermal conductance is 52% higher than values determined during the inactive phase (Aschoff, 1981).