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Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem : A Mesocosm Study

Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem : A Mesocosm Study

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SPISLA, Carsten, Jan TAUCHER, Lennart T. BACH, Mathias HAUNOST, Tim BOXHAMMER, Andrew L. KING, Bettany D. JENKINS, Joselynn R. WALLACE, Andrea LUDWIG, Kai T. LOHBECK, 2021. Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem : A Mesocosm Study. In: Frontiers in Marine Science. Frontiers. 7, 611157. eISSN 2296-7745. Available under: doi: 10.3389/fmars.2020.611157

@article{Spisla2021-01-25Extre-52871, title={Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem : A Mesocosm Study}, year={2021}, doi={10.3389/fmars.2020.611157}, volume={7}, journal={Frontiers in Marine Science}, author={Spisla, Carsten and Taucher, Jan and Bach, Lennart T. and Haunost, Mathias and Boxhammer, Tim and King, Andrew L. and Jenkins, Bettany D. and Wallace, Joselynn R. and Ludwig, Andrea and Lohbeck, Kai T.}, note={Article Number: 611157} }

Ludwig, Andrea Spisla, Carsten Taucher, Jan Bach, Lennart T. 2021-01-25 2021-02-17T10:26:17Z Taucher, Jan Boxhammer, Tim Jenkins, Bettany D. Haunost, Mathias Jenkins, Bettany D. eng Extreme Levels of Ocean Acidification Restructure the Plankton Community and Biogeochemistry of a Temperate Coastal Ecosystem : A Mesocosm Study Ludwig, Andrea Boxhammer, Tim Lohbeck, Kai T. King, Andrew L. 2021-02-17T10:26:17Z King, Andrew L. Wallace, Joselynn R. Attribution 4.0 International Spisla, Carsten Bach, Lennart T. Lohbeck, Kai T. Wallace, Joselynn R. Haunost, Mathias The oceans’ uptake of anthropogenic carbon dioxide (CO<sub>2</sub>) decreases seawater pH and alters the inorganic carbon speciation – summarized in the term ocean acidification (OA). Already today, coastal regions experience episodic pH events during which surface layer pH drops below values projected for the surface ocean at the end of the century. Future OA is expected to further enhance the intensity of these coastal extreme pH events. To evaluate the influence of such episodic OA events in coastal regions, we deployed eight pelagic mesocosms for 53 days in Raunefjord, Norway, and enclosed 56–61 m<sup>3</sup> of local seawater containing a natural plankton community under nutrient limited post-bloom conditions. Four mesocosms were enriched with CO<sub>2</sub> to simulate extreme pCO<sub>2</sub> levels of 1978 – 2069 μatm while the other four served as untreated controls. Here, we present results from multivariate analyses on OA-induced changes in the phyto-, micro-, and mesozooplankton community structure. Pronounced differences in the plankton community emerged early in the experiment, and were amplified by enhanced top-down control throughout the study period. The plankton groups responding most profoundly to high CO<sub>2</sub> conditions were cyanobacteria (negative), chlorophyceae (negative), auto- and heterotrophic microzooplankton (negative), and a variety of mesozooplanktonic taxa, including copepoda (mixed), appendicularia (positive), hydrozoa (positive), fish larvae (positive), and gastropoda (negative). The restructuring of the community coincided with significant changes in the concentration and elemental stoichiometry of particulate organic matter. Results imply that extreme CO<sub>2</sub> events can lead to a substantial reorganization of the planktonic food web, affecting multiple trophic levels from phytoplankton to primary and secondary consumers.

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