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Titolo:
Standard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus)
Autore:
Hurley, JA; Costa, DP;
Indirizzi:
Univ Calif Santa Cruz, Dept Biol, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 l, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 i, Santa Cruz, CA 95064 USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 19, volume: 204, anno: 2001,
pagine: 3273 - 3281
SICI:
0022-0949(200110)204:19<3273:SMRATS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIVING WEDDELL SEALS; OTTER ENHYDRA-LUTRIS; HEART-RATE; OXYGEN-CONSUMPTION; ENERGETICS; THERMOREGULATION; LIMITS; FLOW;
Keywords:
hypometabolism; diving metabolic rate; standard metabolic rate; aerobic dive limit; California sea lion; Zalophus californianus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Hurley, JA Moss Landing Marine Labs, 8272 Moss Landing Rd, Moss Landing, CA 95039 USA Moss Landing Marine Labs 8272 Moss Landing Rd Moss Landing CA USA 95039
Citazione:
J.A. Hurley e D.P. Costa, "Standard metabolic rate at the surface and during trained submersions in adult California sea lions (Zalophus californianus)", J EXP BIOL, 204(19), 2001, pp. 3273-3281

Abstract

The 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 3times 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 hypometabolicresponse 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 arecapable 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.

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Documento generato il 30/05/20 alle ore 13:56:20