Body mass and composition responses to short-term low energy intake are seasonally dependent in Steller sea lions (Eumetopias jubatus).

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Saeko KumagaiA W Trites

Abstract

Steller sea lions (Eumetopias jubatus) were fed restricted iso-caloric amounts of Pacific herring (Clupea pallasi) or walleye pollock (Theragra chalcogramma) for 8-9 days, four times over the course of a year to investigate effects of season and prey composition on sea lion physiology. At these levels, the sea lions lost body mass at a significantly higher rate during winter (1.6 +/- 0.14 kg day(-1)), and at a lower rate during summer (1.2 +/- 0.32 kg day(-1)). Decreases in body fat mass and standard metabolic rates during the trials were similar throughout the seasons and for both diet types. The majority of the body mass that was lost when eating pollock derived from decreases in lipid mass, while a greater proportion of the mass lost when eating herring derived from decreases in lean tissue, except in the summer when the pattern was reversed. Metabolic depression was not observed during all trials despite the constant loss of body mass. Our study supports the hypothesis that restricted energy intake may be more critical to Steller sea lions in the winter months, and that the type of prey consumed (e.g., herring or pollock) may have seasonally specific effects on body mass and composition.

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Citations

Jan 23, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·David A S Rosen, Saeko Kumagai
May 3, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·David A S RosenLisa A Hoopes
Nov 19, 2013·Physiological and Biochemical Zoology : PBZ·Paulina A SzafrańskaMarek Konarzewski
Oct 6, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Heli RouttiGeir Wing Gabrielsen
Jan 17, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Tiphaine Jeanniard du DotAndrew W Trites
Jan 20, 2010·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Julie P RichmondSteven A Zinn

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