Physiology of hibernation under the ice by turtles and frogs.

Successful overwintering under ice by an air-breathing vertebrate requires either effective aquatic respiration if dissolved O(2) is available or the capacity for prolonged anaerobic metabolism if O(2) supplies are limiting. Frogs can remain aerobic for many weeks when submerged at low temperature, even at water PO(2) as low as 30 mmHg, but are unable to… (More)
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