. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAMMALIAN M1BKRNATIOX 81 0 = K W*/J (9) That is. because of the decreasing- surface to weight ratio and the increasing pelt thickness, larger animals cool less rapidly than smaller ones. If we now combine ('((nations (.'{), (8) and (9), M C = AT =m kW1/4 (10) and the temperature difference will vary directly with weight. However, the use of this equation for animals in hibernation at any given TA presumes a common temperature coefficient. If, as Kayser (1960) suggests, the metabolic-weight function during hiberna
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1960 MAMMALIAN M1BKRNATIOX 81 0 = K W*/J (9) That is. because of the decreasing- surface to weight ratio and the increasing pelt thickness, larger animals cool less rapidly than smaller ones. If we now combine ('((nations (.'{), (8) and (9), M C = AT =m kW1/4 (10) and the temperature difference will vary directly with weight. However, the use of this equation for animals in hibernation at any given TA presumes a common temperature coefficient. If, as Kayser (1960) suggests, the metabolic-weight function during hibernation has an exponent near , then the temperature difference may be even more weight dependent: AT=kW!/2 ' (11). 2400 TIME IN HOURS Fig. 5. Body temperatures in hibernating thirteen-lined ground squir- rels (after Ryser, 1952). Equation (10) may also be applied to non-hibernating animals to define the critical temperature differences (Tc) and the associated critical temperatures (TA<0 which mark the lower limit of thermal neutrality and the beginning of chemical regu- ;' MB/C = Tb-TAc = ATc = 4 Wi/4 (12) It has, moreover, a possible relation to hibernation, since an ani- mal in the ordinary hibernating posture which allows minimum heat dissipation cannot reduce its body temperature in the zone of 5 By coincidence, this equation (12) is identical to equation (6). That is to say, the critical temperature differential in °c is equal to the fasting period (f/m = 14) in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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