. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Table 1.—Energetics of arboreal folivores. Thermal Weight Basal rate conductance Mb/C % Species (kg) (cc02/g-hr) (ccO 2/g-hrc C) Observed Expectedf Expected Tb* Ti References Trichosurus vulpecula - - - - Dawson and Hulbert, 1970 Dendrohyrax dorsalis - - - - - Hildwein, 1972 Capromys pilorides 49 24 This study Co
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Table 1.—Energetics of arboreal folivores. Thermal Weight Basal rate conductance Mb/C % Species (kg) (cc02/g-hr) (ccO 2/g-hrc C) Observed Expectedf Expected Tb* Ti References Trichosurus vulpecula - - - - Dawson and Hulbert, 1970 Dendrohyrax dorsalis - - - - - Hildwein, 1972 Capromys pilorides 49 24 This study Coendou prehensilis 58 26 This study Bradypus griseus 57 18 This study Choloepus hoffmanni 37 24 This study Phalanger maculatus 45 21 Dawson and Degabriele, 1973 tExpected. M6/C = 3Aw + 02i * Tb at lower limit of thermoneutrality, T;. in degrees centigrade mainly because Choloepus lacks the dense undercoat found in the three-toed sloth. Morrison (1945) has re- ported that pregnancy in the three-toed sloth improves temperature regulation, but that was not found to be the case in a two-toed sloth in this study (Figure 2). Data on the energetics of thermoregulation in the prehensile-tailed porcupine, Coendou prehensilis, are presented in Figure 3. This species has a basal rate equal to about 63 percent of the value expected from body weight; it has a minimal thermal conductance equal to about 109 percent of that expected from temperate mammals, which is surprisingly low con- sidering that its insulation is mainly derived from a coat of spines having no undercoat of fur over most of its body. The lower limit of thermoneutrality in this porcupine is not defined by the minimal conduct- ance, but rather by a conductance 155 percent of that expected. The shift from one conductance to the Figure 2. Body temperature and rate of oxygen consumption in 3 two-toed s
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