036c8ecc-535d-40fc-90e0-c30e2988fb72 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-23T08:48:42 creation ISO 19115 2016 Krill Ocean Acidification Lipid Data 036c8ecc-535d-40fc-90e0-c30e2988fb72 Antarctic krill (Euphausia superba) are a keystone species in the Southern Ocean, but little is known about how they will respond to climate change. Ocean acidification, caused by sequestration of carbon dioxide into ocean surface waters (pCO2), is known to alter 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 that mimicked near-future ocean acidification (1000, 1500 and 2000 μatm) and an extreme pCO2 level (4000 μatm). The laboratory light regime mimicked the seasonal Southern Ocean photoperiod and krill received a constant food supply. Total lipid mass (mg g -1 DM) of adult krill was unaffected by near-future levels of seawater 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 omega-6 fatty acids (up to 1.2% increase in 18:2n-6, up to 0.8% increase in 20:4n-6 and 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. {"type": "Polygon", "coordinates": [[[147.226905274, -43.0195692357], [147.347293543, -43.0195692357], [147.347293543, -42.9534198619], [147.226905274, -42.9534198619], [147.226905274, -43.0195692357]]]} 147.226905274 147.347293543 -43.0195692357 -42.9534198619 Ocean acidification Southern Ocean DATA ACCESS - Krill Ocean Acidification Lipid [direct download] documentDigital XLSX ORCID ID documentDigital HTML ORCID ID documentDigital HTML ORCID ID documentDigital HTML ORCID ID documentDigital HTML Unnamed resource documentDigital HTML Unnamed resource documentDigital License Graphic PNG Unnamed resource documentDigital HTML