Effects of Environmental Temperature on Oxygen Consumption in Arctic and Temperate-Zone Mammals

Sullivan, Brian; Mullen, Joseph T.

doi:10.1086/physzool.27.1.30152276

Cited by 6 publications

(4 citation statements)

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“…It may be supposed, however, that even in environments uninfluenced by man, it is advantageous for wild mice to be able to adapt themselves metabolically, for short periods, to a low temperature, even though they could not survive in a permanently cold climate. As Sullivan and Mullen [1954] have shown, increased metabolism is the principal means of defence against seasonal cold for mammals that do not hibernate. In the mice of our experiments (and in those which colonize cold stores) this metabolic versatility makes possible survival in novel environments.…”

Section: Discussionmentioning

confidence: 99%

Oxygen Consumption and Body Fat of Mice Living at −3° C

1959

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Mice of strain A2G, living and breeding in an environment at -3°C., have a resting metabolic rate about four times that of controls at 210 C. The corresponding figure for mice of strain C57BL is more than three times that of the controls. In the warm environment C57BL mice have a higher metabolic rate than A2G mice, but in the cold the A2G mice have the higher rate.Abdominal adipose tissue per unit body weight is much lower in the cold in strains A2G and A, but not in strain C57BL. Total body fat in strain A2G is much lower in the cold than in the warm, but is not significantly different in strain C57BL. Strain differences in fat content parallel differences in growth: C57BL mice are lighter than A2G and A mice in the warm but not in the cold; A2G and A mice are lighter in the cold than in the warm, while C57BL mice show no significant difference in the two temperatures.In adipose tissue and body fat, mice of strains A2G and A, but not C57BL, are more variable in the warm than in the cold. A hypothesis is advanced to account for this.

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Section: Discussionmentioning

confidence: 99%

Oxygen Consumption and Body Fat of Mice Living at −3° C

1959

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“…C. wide, with the lower limit at about 7? C. An associated difference in heat tolerance is apparent, for Sullivan and Mullen (1954) found that a condition resembling heat prostration was induced in arctic ground squirrels exposed to ambient temperatures between 25? and 30?…”

Section: That This Relation Pertains In Rodents Thus It Is Of Intermentioning

confidence: 99%

The Relation of Oxygen Consumption to Temperature in Desert Rodents

Dawson

1955

Journal of Mammalogy

111

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“…Certain basic mechanisms of heat loss, such as sweating, are also lacking (Chappell ). Exposure to temperatures above 30 °C for 55 minutes is lethal (Sullivan & Mullen ).…”

Section: Resultsmentioning

confidence: 99%

Arctic ground squirrels Urocitellus parryii as drivers and indicators of change in northern ecosystems

Wheeler

Hik

2012

Mammal Review

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Global warming and increasing human activity are altering northern ecosystems. In these strongly seasonal environments, small herbivorous mammals may have a significant role in determining the trajectory of ecosystem transitions from one state to another. Arctic ground squirrels Urocitellus parryii are a key component of northern terrestrial food webs and are considered ecosystem engineers, exerting a large impact on their habitat through bioturbation. We review and synthesize diverse information about current and past distribution and density of arctic ground squirrels, their physiology and ecological interactions with other species. Factors that appear to affect the distribution and abundance of arctic ground squirrels include increasing temperatures, changes in flooding probability, permafrost thaw, shifting phenology, habitat change, new predators and invasive diseases. Increases in the distribution and density of arctic ground squirrels in northern latitudes and high altitudes could accelerate ecosystem change through facilitation of disturbance‐tolerant species, while decreases in southern and milder climates could remove an important agent of disturbance and prey item. Despite their pervasive ecological influence throughout most of their range, arctic ground squirrels are underrepresented in ecological research, based on a comparison of the number of publications about arctic ground squirrels with the number about other species of the same genus, and about other arctic herbivores. The widespread distribution of arctic ground squirrels, along with their potential to exacerbate and alter trajectories of ecosystem change under global warming, makes them a valuable indicator of ecosystem change and therefore a candidate for increased monitoring.

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Effects of Environmental Temperature on Oxygen Consumption in Arctic and Temperate-Zone Mammals

Cited by 6 publications

References 0 publications

Oxygen Consumption and Body Fat of Mice Living at −3° C

Oxygen Consumption and Body Fat of Mice Living at −3° C

The Relation of Oxygen Consumption to Temperature in Desert Rodents

Arctic ground squirrels Urocitellus parryii as drivers and indicators of change in northern ecosystems

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