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Titolo:
Metabolic effects of low-energy diet on Steller sea lions, Eumetopias jubatus
Autore:
Rosen, DAS; Trites, AW;
Indirizzi:
Univ British Columbia, Marine Mammal Res Unit, Fisheries Ctr, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada
Titolo Testata:
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
fascicolo: 6, volume: 72, anno: 1999,
pagine: 723 - 731
SICI:
1522-2152(199911/12)72:6<723:MEOLDO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
DYNAMIC ACTION SDA; NORTHERN ELEPHANT SEAL; PHOCA-VITULINA; HARBOR SEALS; HEAT INCREMENT; HARP SEALS; ASSIMILATION EFFICIENCY; MIROUNGA-ANGUSTIROSTRIS; DIGESTIVE EFFICIENCY; FOOD-DEPRIVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
73
Recensione:
Indirizzi per estratti:
Indirizzo: Rosen, DAS Univ British Columbia, Marine Mammal Res Unit, Fisheries Ctr, 6248 Biol Sci Rd, Vancouver, BC V6T 1Z4, Canada Univ British Columbia 6248 Biol Sci Rd Vancouver BC Canada V6T 1Z4
Citazione:
D.A.S. Rosen e A.W. Trites, "Metabolic effects of low-energy diet on Steller sea lions, Eumetopias jubatus", PHYSIOL B Z, 72(6), 1999, pp. 723-731

Abstract

Diets of six Steller sea lions (Eumetopias jubatus) were switched between a high (herring) and a low (squid) energy density food for 14 d to determine the effects on ingested prey mass, body mass, resting metabolic rate, andthe heat increment of feeding. Body mass was measured daily, and resting metabolism was measured weekly by gas respirometry. Ingested food mass did not differ significantly between the squid diet and the control or the recovery herring diet periods. As a result of differences in energy density, gross energy intake was significantly lower during the squid diet phase than during either the control or recovery periods. As a result, sea lions lost an average of 1.1 kg/d, totaling 12.2% of their initial body mass by the endof the experimental period. The heat increment of feeding for a 4-kg squidmeal was significantly lower than for a similarly sized meal of herring. Decreases in both absolute (24.0 to 18.0 MJ/d, -24%) and mass-corrected (903to 697 kJ/d/ kg(0.67), -20%) metabolism were observed by the end of the squid feedings. This study suggests that sea lions can depress their resting metabolism in response to decreases in energy intake or body mass, regardless of satiation level.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 05:36:06