Evolutionary temperature compensation of carbon fixation in marine phytoplankton

Samuel Barton (Lead / Corresponding author), James Jenkins, Angus Buckling, C.-Elisa Schaum, Nicholas Smirnoff, John A. Raven, Gabriel Yvon-Durocher (Lead / Corresponding author)

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    Abstract

    The efficiency of carbon sequestration by the biological pump could decline in the coming decades because respiration tends to increase more with temperature than photosynthesis. Despite these differences in the short-term temperature sensitivities of photosynthesis and respiration, it remains unknown whether the long-term impacts of global warming on metabolic rates of phytoplankton can be modulated by evolutionary adaptation. We found that respiration was consistently more temperature dependent than photosynthesis across 18 diverse marine phytoplankton, resulting in universal declines in the rate of carbon fixation with short-term increases in temperature. Long-term experimental evolution under high temperature reversed the short-term stimulation of metabolic rates, resulting in increased rates of carbon fixation. Our findings suggest that thermal adaptation may therefore have an ameliorating impact on the efficiency of phytoplankton as primary mediators of the biological carbon pump.

    Original languageEnglish
    Pages (from-to)722-733
    Number of pages12
    JournalEcology letters
    Volume23
    Issue number4
    Early online date14 Feb 2020
    DOIs
    Publication statusPublished - Apr 2020

    Keywords

    • climate change
    • evolutionary ecology
    • metabolism
    • phytoplankton physiology
    • thermal performance curves

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  • Cite this

    Barton, S., Jenkins, J., Buckling, A., Schaum, C. -E., Smirnoff, N., Raven, J. A., & Yvon-Durocher, G. (2020). Evolutionary temperature compensation of carbon fixation in marine phytoplankton. Ecology letters, 23(4), 722-733. https://doi.org/10.1111/ele.13469