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Preprints
https://doi.org/10.5194/bg-2019-330
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-330
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Aug 2019

29 Aug 2019

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This preprint was under review for the journal BG but the revision was not accepted.

High-throughput screening of sediment bacterial communities from Oxygen Minimum Zones of the northern Indian Ocean

Jovitha Lincy1,2 and Cathrine Manohar1,2 Jovitha Lincy and Cathrine Manohar
  • 1Biological Oceanography Division, CSIR-National Institute of Oceanography (NIO), Goa-403004, India
  • 2Academy of Scientific and Innovative Research (AcSIR), CSIR-NIO Campus, Goa, India

Abstract. The Northern Indian Ocean host two recognized Oxygen Minimum Zones (OMZ): one in the Arabian Sea and the other in the Bay of Bengal region. The next-generation sequencing technique was used to understand the total bacterial diversity from the surface sediment of off Goa within the OMZ of Arabian Sea, and from off Paradip within the OMZ of Bay of Bengal. The dominant phyla identified include Firmicutes (33.06 %) and Proteobacteria (32.44 %) from the Arabian Sea, and Proteobacteria (52.51 %) and Planctomycetes (8.63 %) from the Bay of Bengal. Statistical analysis indicates that bacterial diversity from sediments of the Bay of Bengal OMZ is ~ 48 % higher than the Arabian Sea OMZ. Diverse candidate bacterial clades were also detected, whose function is unknown, but many of these were reported from other OMZs as well, suggesting their putative role in sediment biogeochemistry. Bacterial diversity from the present study reveals that the off Paradip site of Bay of Bengal OMZ is highly diverse and unexplored in comparison to the off Goa site of the Arabian Sea OMZ. Functional diversity analysis indicates that the relative percentage distribution of genes involved in methane, nitrogen, sulfur and many unclassified energy metabolisms is almost the same in both sites, reflecting a similar ecological role, irrespective of the differences in phylotypic diversity.

Jovitha Lincy and Cathrine Manohar

Jovitha Lincy and Cathrine Manohar

Jovitha Lincy and Cathrine Manohar

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Short summary
The study compares the sediment bacterial community structure within the oxygen minimum zone (OMZ) of the Arabian Sea and the Bay of Bengal. Bacterial diversity analysis reveals that the off Paradip site of Bay of Bengal OMZ is highly diverse and unexplored in comparison to the off Goa site of the Arabian Sea OMZ. It is also interesting to note that even though the phylogenetic diversity was different, the relative contribution of functional genes was almost the same.
The study compares the sediment bacterial community structure within the oxygen minimum zone...
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