Diazotrophy in the Indian Ocean: Current understanding and future perspectives
Type | Article | ||||||||||||
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Date | 2023-10 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Chowdhury Subhadeep1, 2, Raes Eric3, Hörstmann Cora1, 2, Ahmed Ayaz4, Ridame Céline5, Metzl Nicolas5, Bhavya P S6, Sato Takuya7, Shiozaki Takuhei8, Bonnet Sophie1, Löscher Carolin R.9, Singh Arvind10, Benavides Mar1, 2 | ||||||||||||
Affiliation(s) | 1 : Aix Marseille Univ, Université de Toulon, CNRS, IRD, MIO UM 110 Marseille ,France 2 : Turing Center for Living Systems Aix‐Marseille University Marseille, France 3 : Flourishing Oceans, Minderoo Foundation Nedlands Western Australia, Australia 4 : Kuwait Institute for Scientific Research Salmiya, Kuwait 5 : Laboratoire LOCEAN/IPSL Sorbonne Université‐CNRS‐IRD‐MNHN Paris, France 6 : Department of Biological Oceanography Leibniz Institute for Baltic Sea Research, Warnemuende Rostock Germany 7 : Graduate School of Agricultural and Life Sciences The University of Tokyo Bunkyo‐ku Tokyo, Japan 8 : Atmosphere and Ocean Research Institute The University of Tokyo Chiba, Japan 9 : Nordcee, Department of Biology University of Southern Denmark Odense ,Denmark 10 : Physical Research Laboratory Ahmedabad, India |
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Source | Limnology And Oceanography Letters (2378-2242) (Wiley), 2023-10 , Vol. 8 , N. 5 , P. 707-722 | ||||||||||||
DOI | 10.1002/lol2.10343 | ||||||||||||
Abstract | Dinitrogen (N2) fixation provides the major source of reactive nitrogen in the open ocean, sustaining biological productivity. The Indian Ocean (IO) covers 22% of the ocean surface, while it only represents 1% of the global diazotroph database. Hence, constraining the sources of nitrogen in the IO is crucial. Here, we compile three decades of N2 fixation and diazotroph DNA data in the IO. Our analysis reveals basin‐scale yearly rates between ~ 7 and 13 Tg N yr−1. These rates are in the range of previous modeling‐based estimates but may represent a lower bound estimate due to the lack of data in this basin. Diazotroph variability among sub‐basins may suggest endemicity but needs to be taken with caution due to biased sampling toward certain seasons and uneven spatial coverage. We provide recommendations for a more accurate representation of the IO in the global nitrogen budget and our knowledge of diazotroph biogeography. |
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