A coastal coccolithophore maintains pH homeostasis and switches carbon sources in response to ocean acidification

Nature Communications
Yi-Wei LiuJustin B Ries

Abstract

Ocean acidification will potentially inhibit calcification by marine organisms; however, the response of the most prolific ocean calcifiers, coccolithophores, to this perturbation remains under characterized. Here we report novel chemical constraints on the response of the widespread coccolithophore species Ochrosphaera neapolitana (O. neapolitana) to changing-CO2 conditions. We cultured this algae under three pCO2-controlled seawater pH conditions (8.05, 8.22, and 8.33). Boron isotopes within the algae's extracellular calcite plates show that this species maintains a constant pH at the calcification site, regardless of CO2-induced changes in pH of the surrounding seawater. Carbon and oxygen isotopes in the algae's calcite plates and carbon isotopes in the algae's organic matter suggest that O. neapolitana utilize carbon from a single internal dissolved inorganic carbon (DIC) pool for both calcification and photosynthesis, and that a greater proportion of dissolved CO2 relative to HCO3- enters the internal DIC pool under acidified conditions. These two observations may explain how O. neapolitana continues calcifying and photosynthesizing at a constant rate under different atmospheric-pCO2 conditions.

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Citations

Oct 23, 2019·Proceedings of the National Academy of Sciences of the United States of America·Michael J HenehanPincelli M Hull
Aug 9, 2020·Acta Biomaterialia·Colin BrownleeGlen L Wheeler
Nov 14, 2021·Proceedings of the National Academy of Sciences of the United States of America·Yuval KadanAssaf Gal

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Methods Mentioned

BETA
scanning electron microscopy

Software Mentioned

CO2SYS
ChemCorrect

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