Oxygen consumption and torpor in the fat-tailed dwarf lemur (Cheirogaleus medius): Rethinking prosimian metabolism

Resting energy metabolism of Goeldi's monkey (Callimico goeldii) is similar to that of Other callitrichids

“…300 g) is similar in body size to many callitrichids, and has an inactive-phase RMR (daytime) of 81% of the mammalian expected. During the active phase, metabolic rate increased substantially, but the animals were active and had access to food, so true active-phase RMR could not be determined [McCormick, 1981]. These data, combined with the callitrichid data, support the hypothesis that RMR is substantially reduced in small-bodied primates during the inactive phase.…”

Resting energy metabolism of Goeldi's monkey (Callimico goeldii) is similar to that of Other callitrichids

“…300 g) is similar in body size to many callitrichids, and has an inactive-phase RMR (daytime) of 81% of the mammalian expected. During the active phase, metabolic rate increased substantially, but the animals were active and had access to food, so true active-phase RMR could not be determined [McCormick, 1981]. These data, combined with the callitrichid data, support the hypothesis that RMR is substantially reduced in small-bodied primates during the inactive phase.…”

Oxygen Consumption in Lemur fulvus: Deviation from the Ideal Model

“…The energetics of the slow loris Nycticebus coucang, has been investigated (Miiller, 1975;Palacio, 1977;Whittow et al, 1977). Derived data on basal rate have been reported for only one lemuriform primate, Cheirogaieus mediUS (McCormick, 1981).…”

“…The rate of metabolism reported for Cheirogaleus medtus was "almost certainly out of the species' thermoneutral range" (McCormick, 1981:608), also as noted by McCormick, these data may not accurately reflect basal metabolism due to activity and feeding during experiments. Basal rates were derived from these values and from values taken during sleep, then "corrected" for reduced body temperature and for the presence of sleep itself (McCormick, 1981). The metabolic rate of Arctocebus calabarensis was determined at Ta = 28-3O"C, which may not be within thermoneutrality (Hildwein, 1972); values for Nycticebus coucang reported by Miiller (1979) were computed only after a 2-h acclimation period and then mean values of minimal V 0, over a period of 30 min or more were reported; basal values for L. fulvus (present study) were minimal values repeated at least once during experiments of 2~4-h duration.…”

Ecological significance of hypometabolism in nonhuman primates: Allometry, adaptation, and deviant diets

“…In some species hypometabolism may reflect a n overall efficiency in metabolic processes, whereas in other species transient hypometabolism may only save energy during periods of inactivity. For example, several prosimians lower their MR during rest periods by lowering body temperature (e.g., Muller, 1979;McCormick, 1981;Muller and Jaksche, 1980). In other species a reduced muscle mass may be the mechanism for hypometabolism (McNab, 1978ab).…”

Resting energy metabolism of Goeldi's monkey (Callimico goeldii) is similar to that of Other callitrichids

“…300 g) is similar in body size to many callitrichids, and has an inactive-phase RMR (daytime) of 81% of the mammalian expected. During the active phase, metabolic rate increased substantially, but the animals were active and had access to food, so true active-phase RMR could not be determined [McCormick, 1981]. These data, combined with the callitrichid data, support the hypothesis that RMR is substantially reduced in small-bodied primates during the inactive phase.…”

Oxygen Consumption in Lemur fulvus: Deviation from the Ideal Model

“…The energetics of the slow loris Nycticebus coucang, has been investigated (Miiller, 1975;Palacio, 1977;Whittow et al, 1977). Derived data on basal rate have been reported for only one lemuriform primate, Cheirogaieus mediUS (McCormick, 1981).…”

“…The rate of metabolism reported for Cheirogaleus medtus was "almost certainly out of the species' thermoneutral range" (McCormick, 1981:608), also as noted by McCormick, these data may not accurately reflect basal metabolism due to activity and feeding during experiments. Basal rates were derived from these values and from values taken during sleep, then "corrected" for reduced body temperature and for the presence of sleep itself (McCormick, 1981). The metabolic rate of Arctocebus calabarensis was determined at Ta = 28-3O"C, which may not be within thermoneutrality (Hildwein, 1972); values for Nycticebus coucang reported by Miiller (1979) were computed only after a 2-h acclimation period and then mean values of minimal V 0, over a period of 30 min or more were reported; basal values for L. fulvus (present study) were minimal values repeated at least once during experiments of 2~4-h duration.…”

Ecological significance of hypometabolism in nonhuman primates: Allometry, adaptation, and deviant diets

“…In some species hypometabolism may reflect a n overall efficiency in metabolic processes, whereas in other species transient hypometabolism may only save energy during periods of inactivity. For example, several prosimians lower their MR during rest periods by lowering body temperature (e.g., Muller, 1979;McCormick, 1981;Muller and Jaksche, 1980). In other species a reduced muscle mass may be the mechanism for hypometabolism (McNab, 1978ab).…”

Resting energy metabolism of Goeldi's monkey (Callimico goeldii) is similar to that of Other callitrichids

“…300 g) is similar in body size to many callitrichids, and has an inactive-phase RMR (daytime) of 81% of the mammalian expected. During the active phase, metabolic rate increased substantially, but the animals were active and had access to food, so true active-phase RMR could not be determined [McCormick, 1981]. These data, combined with the callitrichid data, support the hypothesis that RMR is substantially reduced in small-bodied primates during the inactive phase.…”

Oxygen Consumption in Lemur fulvus: Deviation from the Ideal Model

“…The energetics of the slow loris Nycticebus coucang, has been investigated (Miiller, 1975;Palacio, 1977;Whittow et al, 1977). Derived data on basal rate have been reported for only one lemuriform primate, Cheirogaieus mediUS (McCormick, 1981).…”

“…The rate of metabolism reported for Cheirogaleus medtus was "almost certainly out of the species' thermoneutral range" (McCormick, 1981:608), also as noted by McCormick, these data may not accurately reflect basal metabolism due to activity and feeding during experiments. Basal rates were derived from these values and from values taken during sleep, then "corrected" for reduced body temperature and for the presence of sleep itself (McCormick, 1981). The metabolic rate of Arctocebus calabarensis was determined at Ta = 28-3O"C, which may not be within thermoneutrality (Hildwein, 1972); values for Nycticebus coucang reported by Miiller (1979) were computed only after a 2-h acclimation period and then mean values of minimal V 0, over a period of 30 min or more were reported; basal values for L. fulvus (present study) were minimal values repeated at least once during experiments of 2~4-h duration.…”

Ecological significance of hypometabolism in nonhuman primates: Allometry, adaptation, and deviant diets

“…In some species hypometabolism may reflect a n overall efficiency in metabolic processes, whereas in other species transient hypometabolism may only save energy during periods of inactivity. For example, several prosimians lower their MR during rest periods by lowering body temperature (e.g., Muller, 1979;McCormick, 1981;Muller and Jaksche, 1980). In other species a reduced muscle mass may be the mechanism for hypometabolism (McNab, 1978ab).…”