Biogeosciences
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Articles | Volume 23, issue 8
Articles | Volume 23, issue 8
https://doi.org/10.5194/bg-23-2687-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2687-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 8
Research article
 | 
21 Apr 2026
Research article |  | 21 Apr 2026

Dynamics of island mass effect – Part 2: Phytoplankton physiological responses

Guillaume Bourdin, Lee Karp-Boss, Fabien Lombard, Gabriel Gorsky, and Emmanuel Boss

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Short summary
Island mass effect (IME) refers to elevated chlorophyll a concentrations around islands, often extending hundreds of kilometers into oligotrophic waters. Using satellite-derived nutrient and iron stress indices and in situ bio-optical data from the Tara Pacific expedition, we show that IMEs are associated with recurring iron and macronutrient enrichments, and changes in phytoplankton community composition relative to the regional background ocean.
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