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Effect of Rising Temperature and Carbon Dioxide on the Growth, Photophysiology, and Elemental Ratios of Marine Synechococcus : A Multistressor Approach

Author

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  • Samarpita Basu

    (Earth System Science, University of California Irvine, Irvine, CA 92697, USA)

  • Katherine R. M. Mackey

    (Earth System Science, University of California Irvine, Irvine, CA 92697, USA
    Ecology and Evolutionary Biology, University of California Irvine, Irvine, CA 92697, USA)

Abstract

Marine picocyanobacteria belonging to the genus Synechococcus are one of the most abundant photosynthetic organisms on Earth. They are often exposed to large fluctuations in temperature and CO 2 concentrations in the ocean, which are expected to further change in the coming decades due to ocean acidification and warming resulting from rising atmospheric CO 2 levels. To decipher the effect of changing temperature and CO 2 levels on Synechococcus , six Synechococcus strains previously isolated from various coastal and open ocean sites were exposed to a matrix of three different temperatures (22 °C, 24 °C and 26 °C) and CO 2 levels (400 ppm, 600 ppm and 800 ppm). Thereafter, the specific growth rates, photophysiological parameters ( σ PSII and F v /F m ), C/N (mol/mol) ratios and the nitrogen stable isotopic composition (δ 15 N (‰)) of the strains were measured. Temperature was found to be a stronger driver of the changes in specific growth rates and photophysiology in the Synechococcus strains. Carbon-concentrating mechanisms (CCM) operational in these strains that shield the photosynthetic machinery from directly sensing ambient changes in CO 2 possibly played a major role in causing minimal changes in the specific growth rates under the varying CO 2 levels.

Suggested Citation

  • Samarpita Basu & Katherine R. M. Mackey, 2022. "Effect of Rising Temperature and Carbon Dioxide on the Growth, Photophysiology, and Elemental Ratios of Marine Synechococcus : A Multistressor Approach," Sustainability, MDPI, vol. 14(15), pages 1-21, August.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9508-:d:879102
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    References listed on IDEAS

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    1. Samarpita Basu & Katherine R. M. Mackey, 2018. "Phytoplankton as Key Mediators of the Biological Carbon Pump: Their Responses to a Changing Climate," Sustainability, MDPI, vol. 10(3), pages 1-18, March.
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