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Seasonal and interannual variations in the fatty acid composition of adult Euphausia superba Dana, 1850 (Euphausiacea) samples derived from the Scotia Sea krill fishery

Citation

Ericson, JA and Hellessey, N and Nichols, PD and Kawaguchi, S and Nicol, S and Hoem, N and Virtue, P, Seasonal and interannual variations in the fatty acid composition of adult Euphausia superba Dana, 1850 (Euphausiacea) samples derived from the Scotia Sea krill fishery, Journal of Crustacean Biology, 38, (6) pp. 662-672. ISSN 0278-0372 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 The Authors

DOI: doi:10.1093/jcbiol/ruy032

Abstract

The fatty acid content and composition of the Antarctic krill Euphausia superba Dana, 1850 were investigated using samples collected by a commercial fishing vessel. This dataset allowed comparison between seasons, years (2013–2016), and different fishing locations. Quantities of omega 3 fatty acids 20:5n-3 and 22:6n-3 (mg/g dry mass; DM) were highest in autumn and decreased through winter to reach a spring low. Quantities of the flagellate marker 18:4n-3 and diatom marker 16:1n-7c were variable and did not display the same seasonal fluctuations. In summer, krill had high percentages (% total fatty acids) of 20:5n-3 and 22:6n-3, total PUFA, and low 18:1n-9c/18:1n-7c ratios, indicating a more herbivorous diet. Krill became more omnivorous from autumn to spring, indicated by increasing ratios of 18:1n-9c/18:1n-7c and percentages of Σ 20:1 + 22:1 isomers. Bacterial fatty acids (Σ C15 + C17 + C19 isomers) were minor components year-round (0.9–1.8 %). Seasonal levels of herbivory and omnivory differed between years, and levels of specific fatty acid ratios differed between fishing locations. The fatty acid 18:4n-3 was a major driver of variability in krill fatty acid composition, with no obvious seasonal driver. This is the first study to report krill fatty acid data during all four seasons over consecutive years. This large-scale study highlights the value of using fisheries samples to examine seasonal and annual fluctuations in krill diet and condition.

Item Details

Item Type:Refereed Article
Keywords:Antarctic krill, fatty acid biomarkers, fishing, inferred diet, lipids, Southern Ocean
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
UTAS Author:Ericson, JA (Ms Jessica Ericson)
UTAS Author:Hellessey, N (Miss Nicole Hellessey)
UTAS Author:Nichols, PD (Dr Peter Nichols)
UTAS Author:Kawaguchi, S (Dr So Kawaguchi)
UTAS Author:Nicol, S (Dr Stephen Nicol)
UTAS Author:Virtue, P (Associate Professor Patti Virtue)
ID Code:127393
Year Published:2018
Funding Support:Australian Research Council (LP140100412)
Web of Science® Times Cited:1
Deposited By:Ecology and Biodiversity
Deposited On:2018-07-25
Last Modified:2018-12-11
Downloads:0

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