Allometry of respiratory and haematological parameters of arctic mammal

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

Research output: Contribution to journalArticle

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Abstract

1. 1. The allometric relationships for minimum oxygen consumption and resting minute volume of summer acclimatized Arctic mammals were: V ̇o2 = 0.18 M0.62, V ̇min = 1.93 M0.77, and the exponents of these relationships decreased with decreasing ambient temperature. 2. 2. Oxygen extraction of small mammals in thermoneutrality was 4-5% and decreased at low Ta. Oxygen extraction of large mammals was lowest at high Ta. 3. 3. Expired air temperatures decreased with decreasing air temperatures and differed substantially for different species. 4. 4. Calculated evaporative heat loss in thermoneutrality varied from about 5-16% in different species due to differences in oxygen extraction and expired air temperature. 5. 5. Blood of Arctic mammals has high red cell count, high haemoglobin concentration and low red cell volume compared to temperature zone mammals suggesting hemoconcentration as a mechanism of cold adaptation. © 1979.
Original languageEnglish
Pages (from-to)343-350
Number of pages8
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Volume64
Issue number3
DOIs
Publication statusPublished - 1979

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allometry
Arctic region
mammals
air temperature
oxygen
small mammals
oxygen consumption
hemoglobin
ambient temperature
cells
heat
summer
blood
temperature

Cite this

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title = "Allometry of respiratory and haematological parameters of arctic mammal",
abstract = "1. 1. The allometric relationships for minimum oxygen consumption and resting minute volume of summer acclimatized Arctic mammals were: V ̇o2 = 0.18 M0.62, V ̇min = 1.93 M0.77, and the exponents of these relationships decreased with decreasing ambient temperature. 2. 2. Oxygen extraction of small mammals in thermoneutrality was 4-5{\%} and decreased at low Ta. Oxygen extraction of large mammals was lowest at high Ta. 3. 3. Expired air temperatures decreased with decreasing air temperatures and differed substantially for different species. 4. 4. Calculated evaporative heat loss in thermoneutrality varied from about 5-16{\%} in different species due to differences in oxygen extraction and expired air temperature. 5. 5. Blood of Arctic mammals has high red cell count, high haemoglobin concentration and low red cell volume compared to temperature zone mammals suggesting hemoconcentration as a mechanism of cold adaptation. {\circledC} 1979.",
author = "Withers, {P. C.} and T.M. Casey and K.K. Casey",
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Allometry of respiratory and haematological parameters of arctic mammal. / Withers, P. C.; Casey, T.M.; Casey, K.K.

In: Comparative Biochemistry and Physiology -- Part A: Physiology, Vol. 64, No. 3, 1979, p. 343-350.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Allometry of respiratory and haematological parameters of arctic mammal

AU - Withers, P. C.

AU - Casey, T.M.

AU - Casey, K.K.

PY - 1979

Y1 - 1979

N2 - 1. 1. The allometric relationships for minimum oxygen consumption and resting minute volume of summer acclimatized Arctic mammals were: V ̇o2 = 0.18 M0.62, V ̇min = 1.93 M0.77, and the exponents of these relationships decreased with decreasing ambient temperature. 2. 2. Oxygen extraction of small mammals in thermoneutrality was 4-5% and decreased at low Ta. Oxygen extraction of large mammals was lowest at high Ta. 3. 3. Expired air temperatures decreased with decreasing air temperatures and differed substantially for different species. 4. 4. Calculated evaporative heat loss in thermoneutrality varied from about 5-16% in different species due to differences in oxygen extraction and expired air temperature. 5. 5. Blood of Arctic mammals has high red cell count, high haemoglobin concentration and low red cell volume compared to temperature zone mammals suggesting hemoconcentration as a mechanism of cold adaptation. © 1979.

AB - 1. 1. The allometric relationships for minimum oxygen consumption and resting minute volume of summer acclimatized Arctic mammals were: V ̇o2 = 0.18 M0.62, V ̇min = 1.93 M0.77, and the exponents of these relationships decreased with decreasing ambient temperature. 2. 2. Oxygen extraction of small mammals in thermoneutrality was 4-5% and decreased at low Ta. Oxygen extraction of large mammals was lowest at high Ta. 3. 3. Expired air temperatures decreased with decreasing air temperatures and differed substantially for different species. 4. 4. Calculated evaporative heat loss in thermoneutrality varied from about 5-16% in different species due to differences in oxygen extraction and expired air temperature. 5. 5. Blood of Arctic mammals has high red cell count, high haemoglobin concentration and low red cell volume compared to temperature zone mammals suggesting hemoconcentration as a mechanism of cold adaptation. © 1979.

U2 - 10.1016/0300-9629(79)90453-5

DO - 10.1016/0300-9629(79)90453-5

M3 - Article

VL - 64

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JO - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology

JF - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology

SN - 1095-6433

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ER -