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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 ( p CO 2 ), 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  p CO 2  levels (400 μatm), elevated  p CO 2  levels mimicking near-future ocean acidification (1000, 1500 and 2000 μatm) and an extreme  p CO 2  level (4000 μatm). Total lipid mass (mg g −1  DM) of krill was unaffected by near-future  p CO 2 . Fatty acid composition (%) and fatty acid ratios associated with immune responses and cell membrane fluidity were also unaffected by near-future  p CO 2 , apart from an increase in 18:3n-3/18:2n-6 ratios in krill in 1500 μatm  p CO 2  in winter and spring .  Extreme  p CO 2  had no effect on krill lipid biochemistry during summer. During winter and spring, krill in extreme  p CO 2  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.

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