Metabolism and body temperature in a small hibernator, the meadow jumping mouse, <i>Zapus hudsonius</i>

Morrison, Peter; Ryser, Fred A.

doi:10.1002/jcp.1030600206

Cited by 31 publications

(17 citation statements)

References 13 publications

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“…Unlike the hibernators Perognathus longimembris (Bartholomew and Cade 1957), P. californicus (Tucker 1%2), and Sicista betulina (Johansen and Krog 1959), woodland jumping mice did not show labile body temperatures or sporadic or daily torpidity between T A 5 and 33.5 o C. In the field, however, we have found torpid jumping mice trapped on cold, summer nights. Zapus also shows a constant T B down to 10° C, but then T B becomes more variable (Morrison and Ryser 1962a).…”

Section: Evaporative Water Lossmentioning

confidence: 94%

“…N apaeozapus averaged 4.4 cc 02/g hr. Three meadow jumping mice at the same T A had a metabolic rate of 3.5 to 4.0 cc 0 2/gm hr (Morrison and Ryser 1962a), but these animals were fat. Zapus, unlike N apaeozapus and Sicista, kept increasing its metabolism with declining temperatures from 15 to 3 o C. The latter two showed a lowering of metabolism at or below 10°C.…”

Section: Evaporative Water Lossmentioning

confidence: 97%

“…M. Pearson 1962), C. rufocanns (A. M. Pearson 1962, Microtus pennsylvanicus (Wiegert 1961), and M. arvalis (Jansky 1959). Morrison (1948), who also found high metabolic rates in voles, felt that these high values result from short resting periods interspersed with activity; however, A. M. Pearson (1962) used short measuring periods of 4 minutes to eliminate activity. P. Pearson (1947) also noted high minimum metabolism in the vole Pitymys pinetorum.…”

Section: Metabolism and Thermoregulationmentioning

confidence: 99%

“…Species of the genus Perognathus (family Heteromyidae) seem generally to be characterized by a low basal metabolism, labile body temperatures, sporadic torpidity and tolerance for high ambient temperatures (Bartholomew and Cade 1957; Morrison and Ryser 1962b;Tucker 1962;Cade 1964;Brower and Cade, unpublished). Species of the genus Perognathus (family Heteromyidae) seem generally to be characterized by a low basal metabolism, labile body temperatures, sporadic torpidity and tolerance for high ambient temperatures (Bartholomew and Cade 1957; Morrison and Ryser 1962b;Tucker 1962;Cade 1964;Brower and Cade, unpublished).…”

Section: Metabolism and Thermoregulationmentioning

confidence: 99%

“…P. Pearson ( 1947) also noted high minimum metabolism in the vole Pitymys pinetorum. Morrison (1948), who also found high metabolic rates in voles, felt that these high values result from short resting periods interspersed with activity; however, A. M. Pearson ( 1962) used short measuring periods of 4 minutes to eliminate activity. Microtines also have a limited tolerance for heat (Wiegert 1961;Hart and Heroux 1955; and personal observation) and for hypothermia (Neumann 1962;Cade, unpublished).…”

Section: Physiology and Climatic Adaptationmentioning

confidence: 99%

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Ecology and Physiology of Napaeozapus Insignis (Miller) and Other Woodland Mice

Brower¹,

Cade²

1966

Ecology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.Wiley is collaborating with JSTOR to digitize, preserve and extend access to Ecology -11bstract. The distribution and ecology of the woodland jumping mouse, Napacoz-aplus uisuipliis, were studied in the light of its behavior in the field, its physiology in the laboratory, and by comparison with other species of small rodents. Data from 36 traplines show that jumping mice have no preference for habitats near water. Shrubby ground cover appears to be the most important factor affecting their local abundance. Napaeozaputs has probably been associated so often with streams because these areas favor growth of good ground cover.Woodlan(1 jumping mice were found in nonwooded areas where shrubby ground cover was found. In one nonwooded area it replaced the meadow jumping mouse, Zapus hudsomins. Removal of the population of woodland jumping mice in the fall was followed by the establishment of the meadow species the next spring.Woodland jumping mice and redback voles seldom occurred together in abundant numbers. This separation was partly the result of distinct habitat differences, but in some areas of mixed woods having ground cover, the presence of voles was accompanied by an absence of jumping mice. When jumping mice were present, redback voles were few or absent. This pattern of distribution could not be explained by differences in habitat selection or by competition. Some form of interference could be involved.Woodland jumping mice show a tendency to be more active on colder nights. This behavior contrasts with o1)servations on deer mice by other workers who state that these mice are more active onI warm, cloudy nights.The high population densities of Napavozaputs found in this study were in an area of New York State having boreal elements. The lower densities reported for western and southern areas of the northeastern United States indicate that its overall distribution is affected by the presence of horeal vegetation.Ad libitiml. water consumption shows that redback voles drink more than twice as much as their predicted weight-relative value. Woodland jumping mice drank normal weight-relative amounts, but deer mice drank less. The rate of evaporation in Napaeozapus was considerably lower than that found in sympatric Peromyscus inaniculatus. Its rate of evaporation was closer to values found for some populations of mice from drier climates. These results suggest that moisture is not a critical limiting factor in the distribution of woodland jumping mice. The low rate of evaporation in Napaeozapus could be an adaptation against desiccation during hibernation.The spreading of saliva by the deer mice is an important cooling device. At 37?C deer mice lost 72% of their heat production thro...

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Section: Evaporative Water Lossmentioning

confidence: 94%

Section: Evaporative Water Lossmentioning

confidence: 97%

Section: Metabolism and Thermoregulationmentioning

confidence: 99%

Section: Metabolism and Thermoregulationmentioning

confidence: 99%

Section: Physiology and Climatic Adaptationmentioning

confidence: 99%

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Ecology and Physiology of Napaeozapus Insignis (Miller) and Other Woodland Mice

Brower¹,

Cade²

1966

Ecology

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Reduction of metabolic rate and thermoregulation during daily torpor

1995

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Physiological mechanisms causing reduction of metabolic rate during torpor in heterothermic endotherms are controversial. The original view that metabolic rate is reduced below the basal metabolic rate because the lowered body temperature reduces tissue metabolism has been challenged by a recent hypothesis which claims that metabolic rate during torpor is actively downregulated and is a function of the differential between body temperature and ambient temperature, rather than body temperature per se. In the present study, both the steady-state metabolic rate and body temperature of torpid stripe-faced dunnarts, Sminthopsis macroura (Dasyuridae: Marsupialia), showed two clearly different phases in response to change of air temperature. At air temperatures between 14 and 30 degrees C, metabolic rate and body temperature decreased with air temperature, and metabolic rate showed an exponential relationship with body temperature (r2 = 0.74). The Q10 for metabolic rate was between 2 and 3 over the body temperature range of 16 to 32 degrees C. The difference between body temperature and air temperature over this temperature range did not change significantly, and the metabolic rate was not related to the difference between body temperature and air temperature (P = 0.35). However, the apparent conductance decreased with air temperature. At air temperatures below 14 degrees C, metabolic rate increased linearly with the decrease of air temperature (r2 = 0.58) and body temperature was maintained above 16 degrees C, largely independent of air temperature. Over this air temperature range, metabolic rate was positively correlated with the difference between body temperature and air temperature (r2 = 0.61). Nevertheless, the Q10 for metabolic rate between normothermic and torpid thermoregulating animals at the same air temperature was also in the range of 2-3.(ABSTRACT TRUNCATED AT 250 WORDS)

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Relationships between body temperature, thermal conductance,Q 10 and energy metabolism during daily torpor and hibernation in rodents

Snyder

Nestler

1990

J Comp Physiol B

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In the present paper we examine the ability of rodents to maintain body temperature (TB) following the marked reductions in metabolic heat production associated with torpor. Previously published values for metabolic rate (M), TB and ambient temperature (TA) were used to calculate thermal conductances (C') during normothermy and torpor in rodents capable of daily torpor (11 species) and hibernation (18 species). Values of C' for torpid animals are uniformly lower than C' in normothermic animals. In addition, C' of normothermic and torpid rodents decreases with increasing body mass (BM). However, the slope of the relationship between C' and BM is almost 4-fold greater for normothermic than for torpid animals. Thus, the ability of torpid rodents to conserve body heat by reducing C' decreases with increasing mass. Rodents that use daily torpor tend to be small and they tend to maintain TB well above TA during torpor. Hibernators tend to be larger and regulate TB relatively close to TA. Thus, the reductions in C' appear to be closely correlated with the level of TB regulation during torpor. We suggest that the changes in C' represent a suite of physiological adaptations that have played a central role in the evolution of torpor, enabling rodents to regulate TB above TA during periods of very low heat production. Based on the approach used here we address the controversy of whether reductions in M during torpor are due entirely to temperature effects or whether metabolic inhibition in addition to temperature effects may be important. We suggest that the controversy has been confused by using Q10 to evaluate the relationship of M and TB in endotherms.(ABSTRACT TRUNCATED AT 250 WORDS)

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Metabolism and body temperature in a small hibernator, the meadow jumping mouse, Zapus hudsonius

Cited by 31 publications

References 13 publications

Ecology and Physiology of Napaeozapus Insignis (Miller) and Other Woodland Mice

Ecology and Physiology of Napaeozapus Insignis (Miller) and Other Woodland Mice

Reduction of metabolic rate and thermoregulation during daily torpor

Relationships between body temperature, thermal conductance,Q 10 and energy metabolism during daily torpor and hibernation in rodents

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