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About the Cover
Cover: Time series (approximately every 2 min) of infrared thermograms showing the change in surface temperatures of the golden-mantled ground squirrel (centre inset) during 21% O2 (air), 60 min at 7% O2 (hypoxia) and 60 min of recovery at 21% O2 (air). The feet, ears and nose warm up during early exposure to hypoxia, and the squirrel adopts a heat-loss posture, suggesting an active dumping of heat from the body core to the periphery to aid in the regulated reduction in body temperature. No changes in surface temperatures are seen during air recovery, despite the high heat production and shivering, suggesting a retention of body heat during the period when body temperature comes back to normal. Thus, changes in surface temperatures in hypoxia are consistent with the idea that small mammals regulate their body temperature at a lower level in hypoxia (see article by Tattersall and Milsom, pp. 33-42). The calibration bar represents temperatures from 22°C (blue) to 32°C (red).
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