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Elevated temperature and decreased salinity both affect the biochemical composition of the Antarctic sea-ice diatom Nitzschia lecointei, but not increased pCO2
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0002-8283-656X
2019 (English)In: Polar Biology, ISSN 0722-4060, E-ISSN 1432-2056, p. 2149-2164Article in journal (Other academic) Published
Abstract [en]

Areas in western Antarctica are experiencing rapid climate change, where ocean warming results in more sea ice melt simultaneously as oceanic CO2 levels are increasing. In this study, we have tested how increased temperature (from −1.8 to 3 °C) and decreased salinity (from 35 to 20 and 10) synergistically affect the growth, photophysiology and biochemical composition of the Antarctic sea-ice diatom Nitzschia lecointei. In a separate experiment, we also addressed how ocean acidification (from 400 to 1000 µatm partial pressure of CO2) affects these key physiological parameters. Both positive and negative changes in specific growth rate, particulate organic carbon to particulate organic nitrogen ratio, chl a fluorescence kinetics, lipid peroxidation, carbohydrate content, protein content, fatty acid content and composition were observed when cells were exposed to warming and desalination. However, when cells were subjected to increased pCO2, only Fv/Fm, non-photochemical quenching and lipid peroxidation increased (by 3, 16 and 14%, respectively), and no other of the abovementioned biochemical properties were affected. These results suggest that changes in temperature and salinity may have more effects on the biochemical composition of N. lecointei than ocean acidification. Sea-ice algae are important component of polar food webs, and their nutritional quality may be affected as a result of altered environmental conditions due to climate change and sea ice melt.

Place, publisher, year, edition, pages
2019. p. 2149-2164
Keywords [en]
Fatty acids, PUFA, Salinity, TBARS, Temperature, pCO2
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-401774DOI: 10.1007/s00300-019-02589-yOAI: oai:DiVA.org:uu-401774DiVA, id: diva2:1383875
Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-08

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Torstensson, Anders

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