Circadian Rhythm of Metabolic Rate in Pocket Mice

Chew, Robert M.; Lindberg, R. G.; Hayden, Page

doi:10.2307/1377637

Cited by 48 publications

(14 citation statements)

References 12 publications

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“…Perognathus formosus is known to become torpid, even when there is plentiful food (Bartholomew andCade 1957, Chew, Lindberg, andHayden 1965), and hence do not always follow the laboratory-determined regression of oxygen consumption on temperature. Perognathus formosus is known to become torpid, even when there is plentiful food (Bartholomew andCade 1957, Chew, Lindberg, andHayden 1965), and hence do not always follow the laboratory-determined regression of oxygen consumption on temperature.…”

Section: Comparison Of Direct and Indirect Methodsmentioning

confidence: 99%

Estimating the Energy Metabolism of Free-Living Perognathus Formosus: A Comparison of Direct and Indirect Methods

Mullen¹,

Chew²

1973

Ecology

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The results of an energy metabolism study of free-living Perognathus formosus, performed with the D 2 18 0 method, are compared with data derived from metabolism chamber studies of the same species. Adding an activity correction factor to the metabolism chamber data results in oxygen consumption values essentially no different from those obtained from free-living P. formosus. This agreement was not unexpected, since the two methods share a large common component, i.e., the energy expended for thermoregulation. The agreement was partly fortuitous, however, in that P. formosus happens to behave similarly in nature and in the laboratory. Other species do not so behave. Thus, if prior knowledge is Jacking concerning the metabolic behavior of a species in its natural environment, any indirect method of estimating that behavior would have to be validated by a direct method.

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Section: Comparison Of Direct and Indirect Methodsmentioning

confidence: 99%

Estimating the Energy Metabolism of Free-Living Perognathus Formosus: A Comparison of Direct and Indirect Methods

Mullen¹,

Chew²

1973

Ecology

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“…Most birds and mammals display depressed metabolic rates and T b s during the rest phase of the daily cycle and/or elevated rates during the active phase (Chew, Lindberg & Hayden, 1965;Aschoff, 1970Aschoff, , 1983Kleinknecht, Erkert & Nelson, 1985;Re®netti & Menaker, 1992). Most birds and mammals display depressed metabolic rates and T b s during the rest phase of the daily cycle and/or elevated rates during the active phase (Chew, Lindberg & Hayden, 1965;Aschoff, 1970Aschoff, , 1983Kleinknecht, Erkert & Nelson, 1985;Re®netti & Menaker, 1992).…”

Section: Introductionmentioning

confidence: 99%

“…A less obvious energy-saving adaptation is that asso-ciated with endogenous, circadian rhythms of metabolism. Most birds and mammals display depressed metabolic rates and T b s during the rest phase of the daily cycle and/or elevated rates during the active phase (Chew, Lindberg & Hayden, 1965;Aschoff, 1970Aschoff, , 1983Kleinknecht, Erkert & Nelson, 1985;Re®netti & Menaker, 1992). The amplitude of these daily rhythms is dependent upon body mass in birds and mammals ± smaller species display the greatest amplitudes (Aschoff, 1982;Prinzinger, Pressmar & Schleucher, 1991).…”

Section: Introductionmentioning

confidence: 99%

Circadian metabolic and thermoregulatory patterns of red‐billed woodhoopoes (Phoeniculus purpureus): the influence of huddling

Boix-Hinzen

Lovegrove

1998

Journal of Zoology

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Circadian rhythms of metabolic rate and body temperature were measured in groups of huddling and solitary red-billed woodhoopoes (Phoeniculus purpureus) as a function of ambient temperature. Basal metabolic rates were 30±60% lower than those of similar-sized birds of other species. As a consequence, circadian amplitudes of T b and VO 2¯u ctuation between the rest and activity phases of non-huddling birds were also larger than expected. Circadian rhythms of metabolism save huddling and non-huddling woodhoopoes 19±34% of their potential daily energy expenditure. Birds huddling in groups conserved 12± 29% of the daily energy expenditure of non-huddling birds at ambient temperatures of 20 8C and below. However, at 30 8C huddling birds used c. 12% more energy than non-huddling birds. The various avenues of energy conservation employed by woodhoopoes are suggested to be bene®cial in: a) augmenting the proximate bene®ts of cooperative breeding; and b) optimizing ®tness in the drought-prone sub-Saharan savannahs which are heavily in¯uenced by the El Nin Ä o Southern Oscillations.

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“…Under the experimental procedures employed, a persistent circadian rhythm of arousal of the sort found by Chew, Lindberg and Hayden (1965) in several species of Perognathus would not be apparent. However, the mice tended to arouse shortly before the onset of darkness regardless of how long they had been torpid.…”

Section: Discussionmentioning

confidence: 87%

Periodicity and Energetics of Torpor in the Kangaroo Mouse, Microdipodops Pallidus

Brown¹,

Bartholomew²

1969

Ecology

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The effects of three environmental temperatures and four food rations on the duration and periodicity of torpor were examined, the oxygen consumption of torpid and normothermic kangaroo mice was measured, and temperature profiles in their habitat were obtained during all seasons. Because of their fossorial and nocturnal habits, kangaroo mice need not face environmental temperature above 30°C or much below 0°C although temperatures in their Great Basin habitat normally fluctuate far outside this range. Torpidity affords a reduction in energy expenditure which increases as temperature decreases. At 5°C the oxygen consumption of torpid mice was less than one—sixtieth that of normothermic mice. When the animals were given seeds in excess each day, none became torpid at either 17° or 6°C, but when the daily ration was reduced to 1.5 g all individuals become torpid. The per cent time torpid and the duration of torpor cycles varied inversely with temperature. At 6°C the time in torpor increased when he daily food ration was reduced from 1.5 to 0.5 g but decreased slightly when food in excess was made available at longer intervals. Periods of torpor varied from a few hours to several days. The time in torpor was related to environmental temperature and food supply in such a way that the mice maintained body weight and accumulated food stores under all conditions tested. This suggests that in nature Microdipodops can regulate periods of torpor so as to conserve its stored seeds during both chronic and acute shortages of food.

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Circadian Rhythm of Metabolic Rate in Pocket Mice

Cited by 48 publications

References 12 publications

Estimating the Energy Metabolism of Free-Living Perognathus Formosus: A Comparison of Direct and Indirect Methods

Estimating the Energy Metabolism of Free-Living Perognathus Formosus: A Comparison of Direct and Indirect Methods

Circadian metabolic and thermoregulatory patterns of red‐billed woodhoopoes (Phoeniculus purpureus): the influence of huddling

Periodicity and Energetics of Torpor in the Kangaroo Mouse, Microdipodops Pallidus

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