Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast

Dawn P. Noren; Suzanne M. Budge; Sara J. Iverson; Michael E. Goebel; Daniel P. Costa; Terrie M. Williams

doi:10.1007/s00360-013-0773-0

Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast

Dawn P. Noren, Suzanne M. Budge, Sara J. Iverson, Michael E. Goebel, Daniel P. Costa, Terrie M. Williams

Medicine

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

10 Citas (Scopus)

Resumen

Phocids routinely fast for extended periods. During these fasts, energetic requirements are met primarily through the catabolism of blubber lipid. To assess whether fatty acid (FA) composition changes during the postweaning fast in northern elephant seals, blubber biopsies were acquired longitudinally from 43 pups at 2.3 ± 1.5 and 55.2 ± 3.7 days postweaning in 1999 and 2000. At weaning, short-chain monounsaturated FA (SC-MUFA, ≤18 carbons) dominated the blubber while saturated FA (SFA) were found in the next highest proportion. The major FA (all ≥1 % by mass) comprised approximately 91 % of total blubber FA. In both years, 18:1n-9 and 16:0 were the most prevalent FA. Major FA mobilized during the fast consisted of polyunsaturated FA (PUFA), SFA, and SC-MUFA. Long-chain MUFA (>18 carbons) tended to be conserved. The fractional mobilization value of 20:5n-3 was the highest, resulting in significant reductions of this PUFA. Although concentrations of some blubber FA changed significantly during the postweaning fast, the general FA signature of blubber was similar at weaning and near the end of the fast. Changes in some FA differed across years. For example, the concentration of 20:4n-6, a minor PUFA, was significantly reduced in 1999 but not in 2000. FA mobilization patterns in northern elephant seal pups are somewhat similar to those reported previously for other fasting phocids and terrestrial mammals, though there are some notable differences. Differences in FA mobilization patterns across mammalian species may be related to differences in diets, geographical distribution, environmental factors, physiological adaptations, and life history stage.

Idioma original	English
Páginas (desde-hasta)	1065-1074
Número de páginas	10
Publicación	Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Volumen	183
N.º	8
DOI	https://doi.org/10.1007/s00360-013-0773-0
Estado	Published - dic. 2013

Nota bibliográfica

Funding Information:
Acknowledgments D. Crocker, P. Webb, S. Hayes, J. Burns, and many graduate and undergraduate students provided assistance in the field. The rangers and staff at Año Nuevo State Reserve, California State Park were invaluable to the completion of the project. J. Pett-inger and A. Banks provided assistance in the laboratory at the University of California, Santa Cruz; and S. Lang, C. Beck and others provided assistance in the laboratory at Dalhousie University, Halifax, Nova Scotia. This project was supported by grants to D.P. Noren from the American Museum of Natural History (Lerner-Gray Fund for Marine Research), Friends of Long Marine Laboratory, and University of California Natural Reserve System (Mildred E. Mathias Graduate Student Research Grant). Further support was provided by National Science Foundation grants to T.M. Williams (OPP-9909862) and to D.P. Costa and M.E. Goebel (OPP-9500072). Grants to S.J. Iverson through the Natural Sciences and Engineering Research council (NSERC) of Canada provided additional support. D.P. Noren was supported in part by NSF grant 9730462 to H. Kibak and D.P. Costa and by a Graduate Assistance in Areas of National Need Fellowship, Dept. of Ecology and Evolutionary Biology, University of California, Santa Cruz (UCSC). A portion of this work was performed while D.P. Noren was a National Research Council Postdoctoral Research Associate at the National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, Washington. All procedures comply with the current laws of the United States of America. Research was approved by the Chancellor’s Animal Research Committee (UCSC) and conducted under U.S. National Marine Fisheries Service permit 836. Two anonymous reviewers provided constructive comments on the manuscript.

ASJC Scopus Subject Areas

Ecology, Evolution, Behavior and Systematics
Biochemistry
Physiology
Animal Science and Zoology
Endocrinology

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10.1007/s00360-013-0773-0

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Noren, D. P., Budge, S. M., Iverson, S. J., Goebel, M. E., Costa, D. P., & Williams, T. M. (2013). Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 183(8), 1065-1074. https://doi.org/10.1007/s00360-013-0773-0

Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast. / Noren, Dawn P.; Budge, Suzanne M.; Iverson, Sara J. et al.
En: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, Vol. 183, N.º 8, 12.2013, p. 1065-1074.

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

Noren, DP, Budge, SM, Iverson, SJ, Goebel, ME, Costa, DP & Williams, TM 2013, 'Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast', Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, vol. 183, n.º 8, pp. 1065-1074. https://doi.org/10.1007/s00360-013-0773-0

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abstract = "Phocids routinely fast for extended periods. During these fasts, energetic requirements are met primarily through the catabolism of blubber lipid. To assess whether fatty acid (FA) composition changes during the postweaning fast in northern elephant seals, blubber biopsies were acquired longitudinally from 43 pups at 2.3 ± 1.5 and 55.2 ± 3.7 days postweaning in 1999 and 2000. At weaning, short-chain monounsaturated FA (SC-MUFA, ≤18 carbons) dominated the blubber while saturated FA (SFA) were found in the next highest proportion. The major FA (all ≥1 % by mass) comprised approximately 91 % of total blubber FA. In both years, 18:1n-9 and 16:0 were the most prevalent FA. Major FA mobilized during the fast consisted of polyunsaturated FA (PUFA), SFA, and SC-MUFA. Long-chain MUFA (>18 carbons) tended to be conserved. The fractional mobilization value of 20:5n-3 was the highest, resulting in significant reductions of this PUFA. Although concentrations of some blubber FA changed significantly during the postweaning fast, the general FA signature of blubber was similar at weaning and near the end of the fast. Changes in some FA differed across years. For example, the concentration of 20:4n-6, a minor PUFA, was significantly reduced in 1999 but not in 2000. FA mobilization patterns in northern elephant seal pups are somewhat similar to those reported previously for other fasting phocids and terrestrial mammals, though there are some notable differences. Differences in FA mobilization patterns across mammalian species may be related to differences in diets, geographical distribution, environmental factors, physiological adaptations, and life history stage.",

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note = "Funding Information: Acknowledgments D. Crocker, P. Webb, S. Hayes, J. Burns, and many graduate and undergraduate students provided assistance in the field. The rangers and staff at A{\~n}o Nuevo State Reserve, California State Park were invaluable to the completion of the project. J. Pett-inger and A. Banks provided assistance in the laboratory at the University of California, Santa Cruz; and S. Lang, C. Beck and others provided assistance in the laboratory at Dalhousie University, Halifax, Nova Scotia. This project was supported by grants to D.P. Noren from the American Museum of Natural History (Lerner-Gray Fund for Marine Research), Friends of Long Marine Laboratory, and University of California Natural Reserve System (Mildred E. Mathias Graduate Student Research Grant). Further support was provided by National Science Foundation grants to T.M. Williams (OPP-9909862) and to D.P. Costa and M.E. Goebel (OPP-9500072). Grants to S.J. Iverson through the Natural Sciences and Engineering Research council (NSERC) of Canada provided additional support. D.P. Noren was supported in part by NSF grant 9730462 to H. Kibak and D.P. Costa and by a Graduate Assistance in Areas of National Need Fellowship, Dept. of Ecology and Evolutionary Biology, University of California, Santa Cruz (UCSC). A portion of this work was performed while D.P. Noren was a National Research Council Postdoctoral Research Associate at the National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, Washington. All procedures comply with the current laws of the United States of America. Research was approved by the Chancellor{\textquoteright}s Animal Research Committee (UCSC) and conducted under U.S. National Marine Fisheries Service permit 836. Two anonymous reviewers provided constructive comments on the manuscript.",

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Characterization of blubber fatty acid signatures in northern elephant seals (Mirounga angustirostris) over the postweaning fast

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