期刊
WATER
卷 6, 期 6, 页码 1840-1859出版社
MDPI
DOI: 10.3390/w6061840
关键词
Antarctic phytoplankton; biochemical changes; polyunsaturated fatty acids; nutritional quality; ocean acidification
资金
- Endeavour International Postgraduate Research scholarship at UTAS
- CSIRO Wealth from Oceans top-up scholarship
- Holsworth Wildlife Research Endowment [V0018333]
- Australian Antarctic Science Program [4037, 4026]
Increased seawater pCO(2) has the potential to alter phytoplankton biochemistry, which in turn may negatively affect the nutritional quality of phytoplankton as food for grazers. Our aim was to identify how Antarctic phytoplankton, Pyramimonas gelidicola, Phaeocystis antarctica, and Gymnodinium sp., respond to increased pCO(2). Cultures were maintained in a continuous culture setup to ensure stable CO2 concentrations. Cells were subjected to a range of pCO(2) from ambient to 993 mu atm. We measured phytoplankton response in terms of cell size, cellular carbohydrate content, and elemental, pigment and fatty acid composition and content. We observed few changes in phytoplankton biochemistry with increasing CO2 concentration which were species-specific and predominantly included differences in the fatty acid composition. The C:N ratio was unaffected by CO2 concentration in the three species, while carbohydrate content decreased in Pyramimonas gelidicola, but increased in Phaeocystis antarctica. We found a significant reduction in the content of nutritionally important polyunsaturated fatty acids in Pyramimonas gelidicola cultures under high CO2 treatment, while cellular levels of the polyunsaturated fatty acid 20: 5 omega 3, EPA, in Gymnodinium sp. increased. These changes in fatty acid profile could affect the nutritional quality of phytoplankton as food for grazers, however, further research is needed to identify the mechanisms for the observed species-specific changes and to improve our ability to extrapolate laboratory-based experiments on individual species to natural communities.
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