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

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  • Yi-Wei Liu

    (University of Michigan
    Université de Brest, UBO, CNRS, IRD, Ifremer, Institut Universitaire Européen de la Mer, LEMAR
    Institute of Earth Sciences, Academia Sinica)

  • Robert A. Eagle

    (Université de Brest, UBO, CNRS, IRD, Ifremer, Institut Universitaire Européen de la Mer, LEMAR
    University of California – Los Angeles
    University of California – Los Angeles)

  • Sarah M. Aciego

    (University of Michigan
    University of Wyoming)

  • Rosaleen E. Gilmore

    (University of California – Los Angeles)

  • Justin B. Ries

    (Marine Science Center, Northeastern University)

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.

Suggested Citation

  • Yi-Wei Liu & Robert A. Eagle & Sarah M. Aciego & Rosaleen E. Gilmore & Justin B. Ries, 2018. "A coastal coccolithophore maintains pH homeostasis and switches carbon sources in response to ocean acidification," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04463-7
    DOI: 10.1038/s41467-018-04463-7
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    Cited by:

    1. Hongrui Zhang & Ismael Torres-Romero & Heather M. Stoll, 2022. "Re-examining extreme carbon isotope fractionation in the coccolithophore Ochrosphaera neapolitana," Nature Communications, Nature, vol. 13(1), pages 1-4, December.
    2. Yi-Wei Liu & Robert A. Eagle & Sarah M. Aciego & Rosaleen E. Gilmore & Justin B. Ries, 2022. "Reply to: Re-examining extreme carbon isotope fractionation in the coccolithophore Ochrosphaera neapolitana," Nature Communications, Nature, vol. 13(1), pages 1-3, December.

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