Metabolic and respiratory responses of arctic mammals to ambient temprature during the summer

T.M. Casey, P. C. Withers, K.K. Casey

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Abstract

1. 1. Respiratory frequency (f), tidal volume (Vt) and minute volume ( V ̇min) of eight species and oxygen consumption ( V ̇o2) of six species of summer acclimatized Arctic mammals were similar to that of temperate zone mammals. 2. 2. In small mammals, V ̇o2 increases at low Ta resulted in augmented V ̇min through increased f and Vt, while in large mammals f was relatively constant at low Ta. 3. 3. Except in weasels, basal metabolism was similar in winter and summer. 4. 4. Mass-specific conductance exhibits similar slope on body mass in winter and summer acclimatized animals with a greater intercept for summer animals. 5. 5. Critical gradient (Tb-Tc) exhibits similar slopes on body mass for winter and summer animals with a greater intercept for winter animals. 6. 6. Both large and small Arctic mammals can operate at similar metabolic levels in winter and summer as a result of seasonal pelage changes. © 1979.
Original languageEnglish
Pages (from-to)331-341
Number of pages11
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Volume64
Issue number3
DOIs
Publication statusPublished - 1979

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Arctic region
mammals
summer
winter
animals
basal metabolism
Mustela
tidal volume
respiratory rate
temperate zones
small mammals
oxygen consumption

Cite this

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title = "Metabolic and respiratory responses of arctic mammals to ambient temprature during the summer",
abstract = "1. 1. Respiratory frequency (f), tidal volume (Vt) and minute volume ( V ̇min) of eight species and oxygen consumption ( V ̇o2) of six species of summer acclimatized Arctic mammals were similar to that of temperate zone mammals. 2. 2. In small mammals, V ̇o2 increases at low Ta resulted in augmented V ̇min through increased f and Vt, while in large mammals f was relatively constant at low Ta. 3. 3. Except in weasels, basal metabolism was similar in winter and summer. 4. 4. Mass-specific conductance exhibits similar slope on body mass in winter and summer acclimatized animals with a greater intercept for summer animals. 5. 5. Critical gradient (Tb-Tc) exhibits similar slopes on body mass for winter and summer animals with a greater intercept for winter animals. 6. 6. Both large and small Arctic mammals can operate at similar metabolic levels in winter and summer as a result of seasonal pelage changes. {\circledC} 1979.",
author = "T.M. Casey and Withers, {P. C.} and K.K. Casey",
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Metabolic and respiratory responses of arctic mammals to ambient temprature during the summer. / Casey, T.M.; Withers, P. C.; Casey, K.K.

In: Comparative Biochemistry and Physiology -- Part A: Physiology, Vol. 64, No. 3, 1979, p. 331-341.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Casey, T.M.

AU - Withers, P. C.

AU - Casey, K.K.

PY - 1979

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N2 - 1. 1. Respiratory frequency (f), tidal volume (Vt) and minute volume ( V ̇min) of eight species and oxygen consumption ( V ̇o2) of six species of summer acclimatized Arctic mammals were similar to that of temperate zone mammals. 2. 2. In small mammals, V ̇o2 increases at low Ta resulted in augmented V ̇min through increased f and Vt, while in large mammals f was relatively constant at low Ta. 3. 3. Except in weasels, basal metabolism was similar in winter and summer. 4. 4. Mass-specific conductance exhibits similar slope on body mass in winter and summer acclimatized animals with a greater intercept for summer animals. 5. 5. Critical gradient (Tb-Tc) exhibits similar slopes on body mass for winter and summer animals with a greater intercept for winter animals. 6. 6. Both large and small Arctic mammals can operate at similar metabolic levels in winter and summer as a result of seasonal pelage changes. © 1979.

AB - 1. 1. Respiratory frequency (f), tidal volume (Vt) and minute volume ( V ̇min) of eight species and oxygen consumption ( V ̇o2) of six species of summer acclimatized Arctic mammals were similar to that of temperate zone mammals. 2. 2. In small mammals, V ̇o2 increases at low Ta resulted in augmented V ̇min through increased f and Vt, while in large mammals f was relatively constant at low Ta. 3. 3. Except in weasels, basal metabolism was similar in winter and summer. 4. 4. Mass-specific conductance exhibits similar slope on body mass in winter and summer acclimatized animals with a greater intercept for summer animals. 5. 5. Critical gradient (Tb-Tc) exhibits similar slopes on body mass for winter and summer animals with a greater intercept for winter animals. 6. 6. Both large and small Arctic mammals can operate at similar metabolic levels in winter and summer as a result of seasonal pelage changes. © 1979.

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