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Ocean warming and freshening effects on lipid metabolism in coastal Antarctic phytoplankton assemblages dominated by sub-Antarctic species
Antacli, J.C.; Hernando, M.P.; De Troch, M.; Malanga, G.; Mendiolar, M.; Hernández, D.R.; Varela, D.E.; Antoni, J.; Sahade, R.J.; Schloss, I.R. (2021). Ocean warming and freshening effects on lipid metabolism in coastal Antarctic phytoplankton assemblages dominated by sub-Antarctic species. Sci. Total Environ. 790: 147879. https://hdl.handle.net/10.1016/j.scitotenv.2021.147879
In: Science of the Total Environment. Elsevier: Amsterdam. ISSN 0048-9697; e-ISSN 1879-1026
Peer reviewed article  

Available in  Authors 
    Vlaams Instituut voor de Zee: Non-open access 362359 [ request ]

Keyword
    Marine
Author keywords
    Coastal Antarctica; Fatty acids; Lipid damage; Phytoplankton; Salinity decrease; Temperature increase

Authors  Top 
  • Antacli, J.C.
  • Hernando, M.P.
  • De Troch, M.
  • Malanga, G.
  • Mendiolar, M.
  • Hernández, D.R.
  • Varela, D.E.
  • Antoni, J.
  • Sahade, R.J.
  • Schloss, I.R.

Abstract
    Marine phytoplankton can utilize different strategies to cope with ocean warming and freshening from glacial melting in polar regions, which are disproportionally impacted by global warming. In the present study, we investigated the individual and combined effects of a 4 °C increase in seawater temperature (T+) and a 4 psu decrease in salinity (S−) from ambient values on biomass, nutrient use, fatty acid composition and lipid damage biochemistry of natural phytoplankton assemblages from Potter Cove (25 de Mayo/King George Island, Antarctica). Experiments were conducted by exposing the assemblages to four treatments during a 7-day incubation period using microcosm located along shore from January 23 to 31, 2016. The N:P ratio decreased in all treatments from day 4 onwards, but especially under high temperature (T+). Lipid damage was mainly detected under S0T+ and S−T+ conditions, and it decreased when the production of the antioxidant α-tocopherol increased. This antioxidant protection resulted in a build-up of phytoplankton biomass, especially at T+. Under the combined effect of both stressors (S−T+), the concentration of ω3 fatty acids increased, potentially leading to higher-quality FA composition. These results, which were related to the dominance of sub-Antarctic species in phytoplankton assemblages, contribute to the understanding of the potential consequences of ocean warming and increase seawater freshening on the trophic webs of the Southern Ocean.

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