Regulated hypothermia in the desert shrew

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Desert shrews (Notiosorex crawfordi; 4 g) enter into daily bouts of very shallow torpor, when restricted in their food intake. These bouts, though interrupted and uneven, last throughout that portion of the day the animals' cages are lighted. Body temperature is apparently regulated by fine adjustments of metabolic heat production in hypothermic as well as euthermic desert shrews. Thus, these animals seem to have two temperature thresholds for thermoregulation or body temperature rheostat settings. One is near 38 °C while the other, near 28 °C is likely used exclusively when energy supplies are low. The coefficient of heat transfer is the same at both body temperatures. Power saved by hypothermic animals at air temperatures between 20 and 25 °C amounts to about 96 mW. This is half of the metabolic power output of euthermic shrews at 20 °C and 80% at 25 °C. These results suggest a compromise between the energy savings of a deep torpor and the unimpaired functioning of euthermia.

Original languageEnglish (US)
Pages (from-to)173-176
Number of pages4
JournalJournal of Comparative Physiology B
Volume137
Issue number2
DOIs
StatePublished - Jun 1980
Externally publishedYes

Fingerprint

Hypothermia
Shrews
hypothermia
shrews
body temperature
Body Temperature
Torpor
torpor
deserts
resting periods
desert
animal
Animals
animals
Temperature
thermoregulation
heat transfer coefficient
heat production
Thermogenesis
Body Temperature Regulation

ASJC Scopus subject areas

  • Physiology (medical)
  • Environmental Science(all)
  • Physiology
  • Animal Science and Zoology

Cite this

Regulated hypothermia in the desert shrew. / Lindstedt, Stan L.

In: Journal of Comparative Physiology B, Vol. 137, No. 2, 06.1980, p. 173-176.

Research output: Contribution to journalArticle

@article{1350e96dac514986969405d059f26315,
title = "Regulated hypothermia in the desert shrew",
abstract = "Desert shrews (Notiosorex crawfordi; 4 g) enter into daily bouts of very shallow torpor, when restricted in their food intake. These bouts, though interrupted and uneven, last throughout that portion of the day the animals' cages are lighted. Body temperature is apparently regulated by fine adjustments of metabolic heat production in hypothermic as well as euthermic desert shrews. Thus, these animals seem to have two temperature thresholds for thermoregulation or body temperature rheostat settings. One is near 38 °C while the other, near 28 °C is likely used exclusively when energy supplies are low. The coefficient of heat transfer is the same at both body temperatures. Power saved by hypothermic animals at air temperatures between 20 and 25 °C amounts to about 96 mW. This is half of the metabolic power output of euthermic shrews at 20 °C and 80{\%} at 25 °C. These results suggest a compromise between the energy savings of a deep torpor and the unimpaired functioning of euthermia.",
author = "Lindstedt, {Stan L}",
year = "1980",
month = "6",
doi = "10.1007/BF00689217",
language = "English (US)",
volume = "137",
pages = "173--176",
journal = "Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology",
issn = "0174-1578",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - Regulated hypothermia in the desert shrew

AU - Lindstedt, Stan L

PY - 1980/6

Y1 - 1980/6

N2 - Desert shrews (Notiosorex crawfordi; 4 g) enter into daily bouts of very shallow torpor, when restricted in their food intake. These bouts, though interrupted and uneven, last throughout that portion of the day the animals' cages are lighted. Body temperature is apparently regulated by fine adjustments of metabolic heat production in hypothermic as well as euthermic desert shrews. Thus, these animals seem to have two temperature thresholds for thermoregulation or body temperature rheostat settings. One is near 38 °C while the other, near 28 °C is likely used exclusively when energy supplies are low. The coefficient of heat transfer is the same at both body temperatures. Power saved by hypothermic animals at air temperatures between 20 and 25 °C amounts to about 96 mW. This is half of the metabolic power output of euthermic shrews at 20 °C and 80% at 25 °C. These results suggest a compromise between the energy savings of a deep torpor and the unimpaired functioning of euthermia.

AB - Desert shrews (Notiosorex crawfordi; 4 g) enter into daily bouts of very shallow torpor, when restricted in their food intake. These bouts, though interrupted and uneven, last throughout that portion of the day the animals' cages are lighted. Body temperature is apparently regulated by fine adjustments of metabolic heat production in hypothermic as well as euthermic desert shrews. Thus, these animals seem to have two temperature thresholds for thermoregulation or body temperature rheostat settings. One is near 38 °C while the other, near 28 °C is likely used exclusively when energy supplies are low. The coefficient of heat transfer is the same at both body temperatures. Power saved by hypothermic animals at air temperatures between 20 and 25 °C amounts to about 96 mW. This is half of the metabolic power output of euthermic shrews at 20 °C and 80% at 25 °C. These results suggest a compromise between the energy savings of a deep torpor and the unimpaired functioning of euthermia.

UR - http://www.scopus.com/inward/record.url?scp=0003432571&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0003432571&partnerID=8YFLogxK

U2 - 10.1007/BF00689217

DO - 10.1007/BF00689217

M3 - Article

VL - 137

SP - 173

EP - 176

JO - Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology

JF - Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology

SN - 0174-1578

IS - 2

ER -