Biogeosciences
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Articles | Volume 15, issue 10
Articles | Volume 15, issue 10
https://doi.org/10.5194/bg-15-3107-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/bg-15-3107-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 15, issue 10
Research article
 | 
22 May 2018
Research article |  | 22 May 2018

Aphotic N2 fixation along an oligotrophic to ultraoligotrophic transect in the western tropical South Pacific Ocean

Mar Benavides, Katyanne M. Shoemaker, Pia H. Moisander, Jutta Niggemann, Thorsten Dittmar, Solange Duhamel, Olivier Grosso, Mireille Pujo-Pay, Sandra Hélias-Nunige, Alain Fumenia, and Sophie Bonnet

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ED: Publish subject to minor revisions (review by editor) (28 Mar 2018) by Douglas G. Capone
AR by Mar Benavides on behalf of the Authors (29 Mar 2018)  Author's response    Manuscript
ED: Publish as is (09 Apr 2018) by Douglas G. Capone
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Short summary
We measured N2 fixation rates and identified diazotrophic phylotypes in the mesopelagic layer along a transect spanning from New Caledonia to French Polynesia. N2 fixation rates were low but consistently detected across all depths and stations. A distinct diazotrophic phylotype dominated at 650 dbar, coinciding with the oxygenated Subantarctic Mode Water (SAMW) and suggesting that the distribution of aphotic diazotroph communities is to some extent controlled by water mass structure.
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