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\begin{document}

\title{Diazotroph community and activity in the Southern Indian Ocean}



\author[1]{SUBHADEEP CHOWDHURY}%
\author[2]{Hugo Berthelot}%
\author[2]{Stéphane L'Helguen}%
\author[2]{Jean-François Maguer}%
\author[3]{Carolin Löscher}%
\author[4]{Arvind Singh}%
\author[5]{Nicolas Cassar}%
\author[1]{Sophie Bonnet}%
\author[1]{Mar Benavides}%
\affil[1]{Aix Marseille Université, CNRS, Université de Toulon, IRD, OSU Pythéas, Mediterranean Institute of Oceanography (MIO), UM 110, 13288, Marseille, France}%
\affil[2]{Laboratoire des sciences de l’environnement marin, IUEM, Université de Brest-UMR 6539 CNRS/UBO/IRD,Technopole Brest-Iroise,29280 Plouzane, France}%
\affil[3]{Nordcee, Department of Biology, University of Southern Denmark, Odense 5230, Denmark}%
\affil[4]{Geosciences Division, Physical Research Laboratory, Ahmedabad 380009, India}%
\affil[5]{Division of Earth and Climate Sciences, Nicholas School of the Environment, Duke University, Durham, NC 27708, USA}%


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  \date{May 25, 2024}


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\begin{abstract}
Dinitrogen (N2) fixers (diazotrophs) fuel primary productivity by
providing reactive nitrogen into the ocean ecosystem and promoting CO2
sequestration. N2 fixation has been extensively studied in the low
latitudes of the Atlantic and Pacific Oceans. By comparison, the Indian
Ocean remains the least explored and most enigmatic ocean basin. This is
particularly the case for the Southern Indian Ocean (SIO). Here we
explore N2 fixation activity and diazotroph community composition,
diversity, and abundance from 20 to 60\selectlanguage{ngerman}ºS in the SIO. While this region
plays a key biogeochemical role serving as a link between the Atlantic
and South Pacific Ocean waters, its N2 fixation potential remains
unknown. Our results provide new insights into diazotrophy in a poorly
studied region and expand the range of biomes where diazotrophy may be
observed.%
\end{abstract}\selectlanguage{ngerman}%



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