Abstract
1. 1. Heart rates of adult aquatic red-spotted newts can be conveniently recorded using an impedance pneumograph. 2. 2. Heart rates decrease linearly with decreasing temperature. 3. 3. Submergence in normoxic and hypoxic water at 10°, 15°, and 20°C results in bradycardia which is more pronounced in hypoxic water. 4. 4. At 5°C one newt exhibited the above pattern, but bradycardia was not exhibited by the other newt during normoxic submergence. 5. 5. Diminishing heart rates are probably due to oxygen deficiency, not immersion alone. 6. 6. Recovery from bradycardia in air is rapid and not linked with resumption of aerial breathing.
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