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Articles | Volume 23, issue 15
Articles | Volume 23, issue 15
https://doi.org/10.5194/bg-23-5515-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/bg-23-5515-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 15
Research article
 | 
11 Aug 2026
Research article |  | 11 Aug 2026

Exploring silicon isotope fractionation by silicoflagellates: results from a KOSMOS experiment off Peru

Patricia Grasse, Kristin Doering, Allanah Joy Paul, Avy Bernales, Sonia Sanchez Ramirez, Elisabeth von der Esch, Michelle Graco, Tim Boxhammer, Lennart Thomas Bach, Ulf Riebesell, and Martin Frank

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Short summary
Mesocosm experiments in the Peruvian Upwelling during a coastal El Niño examined silicon cycling and isotope dynamics under changing nutrient conditions. The addition of nitrate-depleted deep water shifted the phytoplankton community from diatoms to silicoflagellates, altering Si isotope signatures. We provide the first field-based estimate of the Si isotope fractionation factor for silicoflagellates, showing their potential importance for interpreting modern and past marine silicon cycling.
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Ecological and biogeochemical functioning of the coastal upwelling...
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