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Antarctic krill lipid and fatty acid content variability is associated to satellite derived chlorophyll a and sea surface temperatures

Citation

Hellessey, N and Johnson, R and Ericson, JA and Nichols, PD and Kawaguchi, S and Nicol, S and Hoem, N and Virtue, P, Antarctic krill lipid and fatty acid content variability is associated to satellite derived chlorophyll a and sea surface temperatures, Scientific Reports, 10, (1) Article 6060. ISSN 2045-2322 (2020) [Refereed Article]


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Copyright Statement

Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41598-020-62800-7

Abstract

Antarctic krill (Euphausia superba) are a key component of the Antarctic food web with considerable lipid reserves that are vital for their health and higher predator survival. Krill lipids are primarily derived from their diet of plankton, in particular diatoms and flagellates. Few attempts have been made to link the spatial and temporal variations in krill lipids to those in their food supply. Remotely-sensed environmental parameters provide large-scale information on the potential availability of krill food, although relating this to physiological and biochemical differences has only been performed on small scales and with limited samples. Our study utilised remotely-sensed data (chlorophyll a and sea surface temperature) coupled with krill lipid data obtained from 3 years of fishery-derived samples. We examined within and between year variation of trends in both the environment and krill biochemistry data. Chlorophyll a levels were positively related to krill lipid levels, particularly triacylglycerol. Plankton fatty acid biomarkers analysed in krill (such as n-3 polyunsaturated fatty acids) increased with decreasing sea surface temperature and increasing chlorophyll a levels. Our study demonstrates the utility of combining remote-sensing and biochemical data in examining biological and physiological relationships between Antarctic krill and the Southern Ocean environment.

Item Details

Item Type:Refereed Article
Keywords:Antarctic krill, fatty acids, chlorophyll a, sea surface temperatures, Southern Ocean
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Assessment and management of Antarctic and Southern Ocean ecosystems
UTAS Author:Hellessey, N (Miss Nicole Hellessey)
UTAS Author:Johnson, R (Dr Robert Johnson)
UTAS Author:Ericson, JA (Ms Jessica Ericson)
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:141984
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Ecology and Biodiversity
Deposited On:2020-12-07
Last Modified:2021-03-10
Downloads:4 View Download Statistics

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