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Freeze Avoidance in a Mammal: Body Temperatures Below 0°C in an Arctic Hibernator
Abstract
Hibernating arctic ground squirrels, Spermophilus parryii , were able to adopt and spontaneously arouse from core body temperatures as low as -2.9°C without freezing. Abdominal body temperatures of ground squirrels hibernating in outdoor burrows were recorded with temperature-sensitive radiotransmitter implants. Body temperatures and soil temperatures at hibernaculum depth reached average minima during February of -1.9° and -6°C, respectively. Laboratory-housed ground squirrels hibernating in ambient temperatures of -4.3°C maintained above 0°C thoracic temperatures but decreased colonic temperatures to as low as -1.3°C. Plasma sampled from animals with below 0°C body temperatures had normal solute concentrations and showed no evidence of containing antifreeze molecules.
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Citations
Cited by
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Body temperature and metabolic rate during natural hypothermia in endotherms
Heldmaier, G., & Ruf, T. (1992) · Journal of Comparative Physiology B · doi:10.1007/bf00301619 · Cited by 350
Coping with Thermal Challenges: Physiological Adaptations to Environmental Temperatures
Tattersall, G. J., Sinclair, B. J., Withers, P. C., Fields, P. A., Seebacher, F., Cooper, C. E., & Maloney, S. K. (2012) · Comprehensive Physiology · doi:10.1002/cphy.c110055 · Cited by 340
Physiology of temperature regulation: Comparative aspects
Bicego, K. C., Barros, R. C. H., & Branco, L. G. S. (2007) · Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology · doi:10.1016/j.cbpa.2006.06.032 · Cited by 276
Metadata
- Authors
- Barnes, B. M.
- Venue
- Science
- Published
- 1989-06-30
- Volume
- 244
- Issue
- 4912
- Pages
- 1593-1595
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1977161523
- Cited by
- 456
- References
- 0
- FWCI
- 8.77
- Type
- journal article
- Language
- en
- Open access
- closed
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- Barnes, B. M. (1989). Freeze Avoidance in a Mammal: Body Temperatures Below 0°C in an Arctic Hibernator. Science. https://doi.org/10.1126/science.2740905
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
