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Science 26 December 1969:
Vol. 166. no. 3913, pp. 1651 - 1654
DOI: 10.1126/science.166.3913.1651
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Articles

Respiration and Deep Diving in the Bottlenose Porpoise

Sam H. Ridgway 1, B. L. Scronce 1, and John Kanwisher 2

1 Naval Undersea Research and Development Center, San Diego, California 92132
2 Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543

A bottlenose porpoise was trained to dive untethered in the open ocean and to exhale into an underwater collecting funnel before surfacing from prescribed depths down to 300 meters. The animal was also taught to hold its breath for periods up to 4 minutes at the surface and then blow in the funnel. Alveolar collapse is probably complete at around 100 meters, and little pulmonary respiratory exchange occurs below that depth. Thoracic collapse was observ visually at 10 to 50 meters and by underwater television to 300 meters.


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