Biogeosciences
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Articles | Volume 22, issue 3
Articles | Volume 22, issue 3
https://doi.org/10.5194/bg-22-625-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-625-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 3
Research article
 | 
04 Feb 2025
Research article |  | 04 Feb 2025

Grazing mortality as a controlling factor in the uncultured non-cyanobacterial diazotroph (Gamma A) around the Kuroshio region

Takuya Sato, Tamaha Yamaguchi, Kiyotaka Hidaka, Sayaka Sogawa, Takashi Setou, Taketoshi Kodama, Takuhei Shiozaki, and Kazutaka Takahashi

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Latest update: 27 Oct 2025
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Short summary
Gamma A is a widespread non-cyanobacterial diazotroph that plays a crucial role in marine ecosystems, but its controlling factors are still largely unknown. This study, for the  first time, quantified microzooplankton grazing on Gamma A and revealed the significance of grazing pressure on Gamma A distribution around the Kuroshio region. It highlights the importance of top-down controls on Gamma A abundance and the associated nitrogen cycle.
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