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Ocean acidification may threaten a unique seaweed community and associated industry in the Baltic Sea


Wild harvest of seaweed supports small-scale, high-value industries in a number of regions in the world. Information is lacking on how increasing carbon dioxide (CO2) concentrations in seawater could impact seaweeds in wild harvest situations. This study focuses on a mixed unattached loose-lying red algal community of Furcellaria lumbricalis in close association with Coccotylus truncatus that is found in the West Estonian Archipelago Sea, NE Baltic Sea. In Estonian coastal waters, the wild harvest of F. lumbricalis started in 1960s and it has since been used as raw material for furcellaran production. The aim of this study was to determine how ocean acidification may impact the balance of these two red algal species in the community. Mechanistic assessment of the carbon physiology of F. lumbricalis and C. truncatus was used to predict productivity and competitive interactions between these species in a high-CO2 world. Carbon use strategies in macroalgae were determined by analysing the natural abundances of carbon isotopes (δ13C), pH drift experiments and photosynthesis vs. dissolved inorganic carbon (DIC) curves. Photosynthesis of F. lumbricalis (operating with a CO2 concentrating mechanism or CCM) performed worse along the broader range of DIC concentrations compared to C. truncatus (non-CCM), especially those characterized under future climate conditions. Therefore, changing seawater carbon chemistry through ocean acidification has the potential to influence the balance of F. lumbricalis and C. truncatus in the community and the efficiency of the wild harvest of this community and the quality of product provided.

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This study was carried out during the training workshop ‘Diversity of carbon use strategies in a different macrophyte communities in the NE Baltic Sea’, held in the Kõiguste field station of the Estonian Marine Institute, University of Tartu on Saaremaa Island in July 2018. JK was funded by the European Union’s Seventh Framework Programme for research, technological development and demonstration though BONUS MARES project, the joint Baltic Sea research and development programme (Art 185). We would also like to thank Holar Sepp for help with determine the natural carbon isotope values from the Department of Geology, University of Tartu.

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Correspondence to Liina Pajusalu.

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Pajusalu, L., Albert, G., Fachon, E. et al. Ocean acidification may threaten a unique seaweed community and associated industry in the Baltic Sea. J Appl Phycol (2019).

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  • Brackish water
  • Carbon dioxide
  • Carbon physiology
  • Coccotylus truncatus
  • Furcellaria lumbricalis
  • Ocean acidification
  • Rhodophyta