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Nasal heat and water exchange in gray seals

Nasal heat and water exchange in gray seals Studies of and water mare homeotherms are few and those existg were performed over narrow ranges of ambient temperatures (4, 7, 17). most cases, all parameters necessary for calculatg respiratory and water loss were not recorded the same dividuals under controlled experimental conditions. Moreover, the only study hitherto performed on pnipeds was carried out on a species from the temperate zone (7). The purpose of the present vestigation, therefore, was to elucidate the importance of for and water balance over a wide range of ambient temperatures the subarctic gray seal (Halichoerus grypus), which was subjected to controlled laboratory conditions. MATERIALS AND METHODS Pnipedia; balance Halichoerus grypus; thermoregulation; body water MARE MAMMALS AT HIGH LATITUDES spend most of their lives cold water that has a conductivity -25 times greater than that of air. The temperature gradient between the animal and the water is usually ~30°C and thus imposes a substantial and constant negative thermaoad on the animal. Protection agast excessive loss over the body surfaces is usually provided by a thick layer of subcutaneous blubber, and where this is not present (i.e., flippers), conservation can be achieved by use of counter-current circulation (21, 23). However, considerable amounts of may http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

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Publisher
The American Physiological Society
Copyright
Copyright © 1987 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
Publisher site
See Article on Publisher Site

Abstract

Studies of and water mare homeotherms are few and those existg were performed over narrow ranges of ambient temperatures (4, 7, 17). most cases, all parameters necessary for calculatg respiratory and water loss were not recorded the same dividuals under controlled experimental conditions. Moreover, the only study hitherto performed on pnipeds was carried out on a species from the temperate zone (7). The purpose of the present vestigation, therefore, was to elucidate the importance of for and water balance over a wide range of ambient temperatures the subarctic gray seal (Halichoerus grypus), which was subjected to controlled laboratory conditions. MATERIALS AND METHODS Pnipedia; balance Halichoerus grypus; thermoregulation; body water MARE MAMMALS AT HIGH LATITUDES spend most of their lives cold water that has a conductivity -25 times greater than that of air. The temperature gradient between the animal and the water is usually ~30°C and thus imposes a substantial and constant negative thermaoad on the animal. Protection agast excessive loss over the body surfaces is usually provided by a thick layer of subcutaneous blubber, and where this is not present (i.e., flippers), conservation can be achieved by use of counter-current circulation (21, 23). However, considerable amounts of may

Journal

AJP - Regulatory, Integrative and Comparative PhysiologyThe American Physiological Society

Published: Dec 1, 1987

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