Diversity of culturable nitrate-reducing bacteria from the Arabian Sea oxygen minimum zone

Mulla, Amara Begum; Fernandes, Genevieve L; Menezes, Larissa D.; Meena, Ramavatar; Naik, Hema; Gauns, Mangesh; Damare, Samir

doi:10.1016/j.dsr2.2017.12.014

Cited by 26 publications

(25 citation statements)

References 38 publications

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“…The DO concentration among the three sampled locations is consistent with results previously described in the Indian Ocean OMZs (Bristow et al, 2017;Mulla et al, 2017;Bandekar et al, 2018), where ASTS exhibited intense oxygen minima conditions at mid-depths than the Bay of Bengal (BoBTS), and II2 having oxygen values above the defined threshold (<20 µM). Salinity at BoBTS was lower in surface in comparison to ASTS and II2.…”

Section: Variation In Physicochemical Parameterssupporting

confidence: 89%

“…The relatively abundant genera indicated to be present at low DO and play a role in the nitrogen cycle. For example; Bacillus and Nitrospina are actively involved in nitrate reduction and nitrite oxidation respectively at low DO in the OMZs (Mulla et al, 2017;Bertagnolli and Stewart, 2018) while even genera such as Kordiimonas found to be involved in degradation of polycyclic hydrocarbons, aromatic and halogenated compounds making them inhabit these oligotrophic BoB waters. At II2 the depths 110, 160, and 201 m were negatively correlated with DO, inhabiting groups of bacteria involved in nitrate oxidation (LS-NOB, Nitrospina) and nitrate reduction processes (SUP05 clade, Pelagibacteraceae bacterium ETNP-OMZ-SAG-A7, Pelagibacteraceae bacterium ETNP-OMZ-SAG-E5).…”

Section: Physicochemical Drivers Of Prokaryotic Community Distributionmentioning

confidence: 99%

“…Other taxa at class-level including the Betaproteobacteria, Deltaproteobacteria, Actinobacteria, Nitrospinia, Planctomycetacia, and SAR406 clade were also well-reported however varied along the depths and sites sampled in the Indian Ocean OMZs (Fuchs et al, 2005;Bandekar et al, 2018;Fernandes et al, 2019). Pelagic nitrogen and sulfur cycling in the OMZs of the Indian Ocean have recently revealed presence of nitrate-reducing and sulfur-oxidizing bacteria based on biochemical of culture-dependent studies (Mulla et al, 2017;Menezes et al, 2018;Fernandes et al, 2019). Metagenomic analysis in the AS OMZ have revealed presence of denitrifiers and annamox bacteria (Bandekar et al, 2018).…”

Section: Introductionmentioning

confidence: 96%

“…The pelagic microbial communities distributed in the Indian Ocean have been reported recurrently with the occurrence of Proteobacteria as the most dominant phyla. Culture-dependent and independent analysis of the AS and BoB OMZ and non-OMZ waters have shown a high representation of δ-Proteobacteria and γ-Proteobacteria affiliated to Proteobacteria (Riemann et al, 1999;Fuchs et al, 2005;Divya et al, 2011;Jain et al, 2014;Wang et al, 2016;Bristow et al, 2017;Mulla et al, 2017;Bandekar et al, 2018;Qian et al, 2018;Rajpathak et al, 2018;Fernandes et al, 2019;Paingankar et al, 2019). Other taxa at class-level including the Betaproteobacteria, Deltaproteobacteria, Actinobacteria, Nitrospinia, Planctomycetacia, and SAR406 clade were also well-reported however varied along the depths and sites sampled in the Indian Ocean OMZs (Fuchs et al, 2005;Bandekar et al, 2018;Fernandes et al, 2019).…”

Section: Introductionmentioning

confidence: 97%

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Diversity of Bacterial Community in the Oxygen Minimum Zones of Arabian Sea and Bay of Bengal as Deduced by Illumina Sequencing

2020

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The Indian Ocean harbors oxygen minimum zones (OMZs) in the Arabian Sea and Bay of Bengal, with dissolved oxygen < 20 µM, located at the mid-depths of the water column. Till date, high-throughput sequence-data on depth-wise distribution of prokaryotic communities have rarely been reported from these OMZs. The present study aimed to characterize the prokaryotic diversity inhabiting Arabian Sea Time Series (ASTS) and India's Idea 2 (II2) in the Arabian Sea, and Bay of Bengal Time Series (BoBTS) in the Bay of Bengal OMZs based on amplicon sequencing of 16S rRNA gene regions, along six sampled depths in the water column. High prokaryotic richness was observed in the Arabian Sea and Bay of Bengal samples. Operational taxonomic units (OTUs) in the range of 1249-3298 were identified, wherein, less prokaryotic diversity was observed at surface and within oxygen minimum depths. At phylum level, most OTUs were affiliated to Bacteroidetes, Chloroflexi, Cyanobacteria, Marinimicrobia, Planctomycetes, and Proteobacteria. Prokaryotic community differed between ASTS, II2 and BoBTS locations along varying physicochemical conditions. Predictive functional profiling of the bacterial communities suggested the involvement of abundant microbes in nitrogen and sulfur metabolism pathways. Bacterial isolates belonging to genera from the clades, δ-Proteobacteria and γ-Proteobacteria, described previously for their participation in biogeochemical cycling of N-and-S in the OMZs were reported from deoxygenated waters of both the basins. Bacteria involved in anammox such as Candidatus Scalindua were found to be relatively high at ASTS and II2 locations in the Arabian Sea. Further studies are required to ascertain the role of abundant bacteria along the dynamic oceanographic processes in the OMZs.

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Section: Variation In Physicochemical Parameterssupporting

confidence: 89%

Section: Physicochemical Drivers Of Prokaryotic Community Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

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Diversity of Bacterial Community in the Oxygen Minimum Zones of Arabian Sea and Bay of Bengal as Deduced by Illumina Sequencing

2020

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“…Efforts to culture bacteria from the deep ocean (>200 m) have focused mostly on isolates from hydrothermal vents [23][24][25], whale carcasses [26], trenches [27], and deep-sea sediments [22,[28][29][30][31]. Thus, very few studies have analyzed the diversity of isolates from mesopelagic (in particular the oxygen minimum zone (OMZ) [32][33][34]), the bathypelagic and abyssopelagic waters [20,[35][36][37], and those available were mainly done at a local or regional scale. Thus, a study of the culturable microorganisms covering vertical gradients including underexplored areas such as the OMZ and the bathypelagic areas is missing.…”

Section: Introductionmentioning

confidence: 99%

Diversity patterns of marine heterotrophic culturable bacteria along vertical and latitudinal gradients

Sanz-Sáez

Salazar

Lara

et al. 2019

Preprint

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Nowadays, there is a significant gap in the knowledge of the diversity and patterns for marine heterotrophic culturable microorganisms. In addition, most of the bacterial isolation efforts have focused on the photic ocean leaving the deep ocean less explored.We have isolated 1561 bacterial strains covering both photic (817) and aphotic layers (744) including isolates from the oxygen minimum zone (362) and the bathypelagic (382) from a variety of oceanographic regions including the North Western Mediterranean Sea, the North and South Atlantic Oceans, the Indian, the Pacific, and the Arctic Oceans. The partial sequencing of the 16S rRNA gene of all isolates revealed that they mainly affiliate with the classes Alphaproteobacteria (35.9%) and Gammaproteobacteria (38.6%), as well as, phylum Bacteroidetes (16.5%). The genera Alteromonas and Erythrobacter were the most widespread heterotrophic bacteria in the ocean able to grow on solid agar media. When comparing the sequences of all isolates, 37% of them were 100% identical.In fact, we found that 59% of the total aphotic isolates were 100% identical to photic isolates, indicating the ubiquity of some bacterial isolates along the water column.Unweighted UniFrac distances did not show significant differences among stations regardless of their geographic distance or depth, reflecting the wide dispersion of the culturable bacterial assemblage. This isolates collection provides an overview of the distribution patterns of cosmopolitan marine culturable heterotrophic bacteria.

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Biogeochemistry of Nitrogen in the Marine System with Special Emphasis on the Arabian Sea and Bay of Bengal

Sivan

Mazumdar

Peketi

et al. 2022

Systems Biogeochemistry of Major Marine Biomes

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Diversity of culturable nitrate-reducing bacteria from the Arabian Sea oxygen minimum zone

Cited by 26 publications

References 38 publications

Diversity of Bacterial Community in the Oxygen Minimum Zones of Arabian Sea and Bay of Bengal as Deduced by Illumina Sequencing

Diversity of Bacterial Community in the Oxygen Minimum Zones of Arabian Sea and Bay of Bengal as Deduced by Illumina Sequencing

Diversity patterns of marine heterotrophic culturable bacteria along vertical and latitudinal gradients

Biogeochemistry of Nitrogen in the Marine System with Special Emphasis on the Arabian Sea and Bay of Bengal

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