Standard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus)

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Hurley, J. A., & Costa, D. P. (2001). Standard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus). Journal of Experimental Biology, 204(19), 3273-3281.
Metadata
TitleStandard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus)
AuthorsJ. Hurley, D. Costa
AbstractThe metabolic rate (MR) of four adult California sea lions (Zalophus californianus), two males and two females, was quantified during trained submersion and stationing behavior in laboratory tanks. MR was measured, at rest and for single submersions of increasing duration (1-7 min), by measuring oxygen consumption using open-circuit, indirect calorimetry. Standard MR was measured under conditions defined for basal MR and was found to be 1.9 to 3 times that predicted for terrestrial animals of similar size. Submersion MRs were calculated from the post-submersion oxygen debt and declined to as little as 47% of standard MR on the longest submersions. This hypometabolic response was proportional to the duration of submersion and was greatest for the maximum duration submersions. Short submersions produced MRs equivalent to measured standard MR. These data suggest that although California sea lions maintain an elevated metabolism under standard conditions, they are capable of reducing their metabolism in response to the needs of diving. Such metabolic flexibility enables sea lions to moderate their oxygen use during diving and to extend their aerobic diving capability.
JournalJournal of Experimental Biology
Date2001
Volume204
Issue19
Start page3273
End page3281
ISSN0022-0949
Subjectsanimal, article, basal metabolic rate, female, immersion, kinetics, male, metabolism, oxygen consumption, seal, Animals, Basal Metabolism, Sea Lions, Animalia, Otariidae, Panthera leo, Phocidae, Vertebrata, Zalophus californianus
NoteCited By (since 1996):40, Marine Mammals, Birds & Turtles, CODEN: JEBIA

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