Effects of a submarine eruption on the performance of two brown seaweeds

Ocean acidification

Highlights

  • The Fv/Fm of both seaweeds did not change at the locations affected by the eruption
  • P. pavonica suffered a decalcification at the location near to submarine eruption
  • Both seaweeds lost phenolic compounds and antioxidant activity at locations affected

Abstract
World oceans are becoming more acid as a consequence of CO2 anthropogenic emissions, with multiple physiological and ecological implications. So far, our understanding is mainly limited to some species through in vitro experimentation. In this study, we took advantage of a recent submarine eruption (from October 2011 to March 2012) at ~ 1 nautical mile offshore El Hierro Island (Canary Islands, central east Atlantic) to determine whether altered physical-chemical conditions, mainly sudden natural ocean acidification, affected the morphology, photosynthesis (in situ Chl-a fluorescence) and physiological performance (photo-protective mechanisms and oxidative stress) of the conspicuous brown seaweeds Padina pavonica – a species with carbonate deposition – and

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