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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/bg-2019-445
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-445
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Jan 2020

13 Jan 2020

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A revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Diversity and distribution of Nitrogen Fixation Genes in the Oxygen Minimum Zones of the World Oceans

Amal Jayakumar and Bess B. Ward Amal Jayakumar and Bess B. Ward
  • Department of Geosciences, Princeton University, Princeton, NJ 08544, USA

Abstract. Diversity and community composition of nitrogen fixing microbes in the three main oxygen minimum zones (OMZs) of the world ocean were investigated using operational taxonomic unit (OTU) analysis of nifH clone libraries. Representatives of the all four main clusters of nifH genes were detected. Cluster I sequences were most diverse in the surface waters and the most abundant OTUs were affiliated with Alpha- and Gammaproteobacteria. Cluster II, III, IV assemblages were most diverse at oxygen depleted depths and none of the sequences were closely related to sequences from cultivated organisms. The OTUs were biogeographically distinct for the most part – there was little overlap among regions, between depths or between cDNA and DNA. Only a few cyanobacterial sequences were detected. The prevalence and diversity of microbes that harbour nifH genes in the OMZ regions, where low rates of N fixation are reported, remains an enigma.

Amal Jayakumar and Bess B. Ward

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Status: closed
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Amal Jayakumar and Bess B. Ward

Amal Jayakumar and Bess B. Ward

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