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Journal of Experimental Biology, Vol 183, Issue 1 341-346, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Muscle temperature and swim velocity profiles during diving in a Weddell seal, Leptonychotes weddellii

PJ Ponganis, GL Kooyman, MA Castellini, EP Ponganis and KV Ponganis
Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla.

Locomotory muscle temperature and swim velocity profiles of an adult Weddell seal were recorded over a 21 h period. The highest temperatures occurred during a prolonged surface period (mean 37.3 degrees C, S.D. 0.16 degrees C). Muscle temperature averaged 36.8 and 36.6 degrees C (S.D. 0.25 degrees C, 0.19 degrees C) during two dive bouts and showed no consistent fluctuations between dive and interdive surface intervals. Swim velocities were also constant, near 1.3 m s-1. These data indicate that past records of low aortic temperatures (35 degrees C) during and after prolonged dives are not indicative of whole-body temperature changes, and that muscle temperature, even during dives as long as 45 min, remains near 37 degrees C.


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© The Company of Biologists Ltd 1993