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Article Dans Une Revue Limnology and Oceanography Letters Année : 2023

Diazotrophy in the Indian Ocean: Current understanding and future perspectives

Subhadeep Chowdhury
Eric Raes
  • Fonction : Auteur
Cora Hörstmann
  • Fonction : Auteur
Ayaz Ahmed
  • Fonction : Auteur
P Bhavya
  • Fonction : Auteur
Takuya Sato
Takuhei Shiozaki
Sophie Bonnet
Carolin Löscher
Arvind Singh
Mar Benavides

Résumé

Abstract Dinitrogen (N 2 ) 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 N 2 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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hal-04239722 , version 1 (13-10-2023)

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Subhadeep Chowdhury, Eric Raes, Cora Hörstmann, Ayaz Ahmed, Céline Ridame, et al.. Diazotrophy in the Indian Ocean: Current understanding and future perspectives. Limnology and Oceanography Letters, 2023, 8 (5), pp.707-722. ⟨10.1002/lol2.10343⟩. ⟨hal-04239722⟩
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