Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 18
Articles | Volume 22, issue 18
https://doi.org/10.5194/bg-22-4865-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4865-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 18
Research article
 | 
23 Sep 2025
Research article |  | 23 Sep 2025

Relative enrichment of ammonium and its impacts on open-ocean phytoplankton community composition under a high-emissions scenario

Pearse J. Buchanan, Juan J. Pierella Karlusich, Robyn E. Tuerena, Roxana Shafiee, E. Malcolm S. Woodward, Chris Bowler, and Alessandro Tagliabue

Supplement

https://doi.org/10.5194/bg-22-4865-2025-supplement

Data sets

Supplementary datasets1-4 Pearse J. Buchanan https://doi.org/10.5281/zenodo.14194938

Total V9 rDNA information organized at the OTU level for the Tara Oceans Expedition (2009-2013), including the Tara Polar Circle Expedition (2013) N. Henry et al. https://doi.org/10.5281/zenodo.3768510

Analysis scripts Pearse J. Buchanan https://doi.org/10.5281/zenodo.7630283

Model code and software

PISCESv2 code Pearse J. Buchanan https://doi.org/10.5281/zenodo.15612548

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Short summary
Ammonium is a form of nitrogen that may become more important for growth of marine primary producers (i.e., phytoplankton) in the future. Because some phytoplankton taxa have a greater affinity for ammonium than others, the relative increase in ammonium could cause shifts in community composition. We quantify ammonium enrichment, identify its drivers and isolate the possible effect on phytoplankton community composition under a high-emissions scenario.
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