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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Communications biology
2025
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/39987204/ |
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Table of Contents:
- Unveiling the contribution of particle-associated non-cyanobacterial diazotrophs to N fixation in the upper mesopelagic North Pacific Gyre. Reeder, Christian F Filella, Alba Voznyuk, Anna Coët, Arthur James, Reece C Rohrer, Tully White, Angelicque E Berline, Léo Grosso, Olivier van Dijken, Gert Arrigo, Kevin R Mills, Matthew M Turk-Kubo, Kendra A Benavides, Mar Nitrogen Fixation Pacific Ocean Cyanobacteria Seawater Gammaproteobacteria Dinitrogen (N) fixation supports marine life through the supply of reactive nitrogen. Recent studies suggest that particle-associated non-cyanobacterial diazotrophs (NCDs) could contribute significantly to N fixation contrary to the paradigm of diazotrophy as primarily driven by cyanobacterial genera. We examine the community composition of NCDs associated with suspended, slow, and fast-sinking particles in the North Pacific Subtropical Gyre. Suspended and slow-sinking particles showed a higher abundance of cyanobacterial diazotrophs than fast-sinking particles, while fast-sinking particles showed a higher diversity of NCDs including Marinobacter, Oceanobacter and Pseudomonas. Using single-cell mass spectrometry we find that Gammaproteobacteria N fixation rates were higher on suspended and slow-sinking particles (up to 67 ± 48.54 fmol N cell⁻¹ d⁻¹), while putative NCDs' rates were highest on fast-sinking particles (121 ± 22.02 fmol N cell⁻¹ d⁻¹). These rates are comparable to previous diazotrophic cyanobacteria observations, suggesting that particle-associated NCDs may be important contributors to pelagic N fixation.