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Near-future ocean acidification does not alter the lipid content and fatty acid composition of adult Antarctic krill

Citation

Ericson, JA and Hellessey, N and Kawaguchi, S and Nichols, PD and Nicol, S and Hoem, N and Virtue, P, Near-future ocean acidification does not alter the lipid content and fatty acid composition of adult Antarctic krill, Scientific Reports, 9 Article 12375. ISSN 2045-2322 (2019) [Refereed Article]


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Copyright Statement

The Author(s) 2019. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41598-019-48665-5

Abstract

Euphausia superba (Antarctic krill) is a keystone species in the Southern Ocean, but little is known about how it will respond to climate change. Ocean acidification, caused by sequestration of carbon dioxide into ocean surface waters (pCO2), alters the lipid biochemistry of some organisms. This can have cascading effects up the food chain. In a year-long laboratory experiment adult krill were exposed to ambient seawater pCO2 levels (400 μatm), elevated pCO2 levels mimicking near-future ocean acidification (1000, 1500 and 2000 μatm) and an extreme pCO2 level (4000 μatm). Total lipid mass (mg g−1 DM) of krill was unaffected by near-future pCO2. Fatty acid composition (%) and fatty acid ratios associated with immune responses and cell membrane fluidity were also unaffected by near-future pCO2, apart from an increase in 18:3n-3/18:2n-6 ratios in krill in 1500 μatm pCO2 in winter and spring. Extreme pCO2 had no effect on krill lipid biochemistry during summer. During winter and spring, krill in extreme pCO2 had elevated levels of 18:2n-6 (up to 1.2% increase), 20:4n-6 (up to 0.8% increase), lower 18:3n-3/18:2n-6 and 20:5n-3/20:4n-6 ratios, and showed evidence of increased membrane fluidity (up to three-fold increase in phospholipid/sterol ratios). These results indicate that the lipid biochemistry of adult krill is robust to near-future ocean acidification.

Item Details

Item Type:Refereed Article
Keywords:lipids. fatty acids, Antarctic krill
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecological Physiology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
UTAS Author:Ericson, JA (Ms Jessica Ericson)
UTAS Author:Hellessey, N (Miss Nicole Hellessey)
UTAS Author:Kawaguchi, S (Dr So Kawaguchi)
UTAS Author:Nichols, PD (Dr Peter Nichols)
UTAS Author:Nicol, S (Dr Stephen Nicol)
UTAS Author:Virtue, P (Associate Professor Patti Virtue)
ID Code:134669
Year Published:2019
Funding Support:Australian Research Council (LP140100412)
Deposited By:Ecology and Biodiversity
Deposited On:2019-08-27
Last Modified:2019-09-06
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