An exploration of microbial and associated functional diversity in the OMZ and non-OMZ areas in the Bay of Bengal

Rajpathak, Shriram N.; Banerjee, Roumik; Mishra, Pawan; Khedkar, Asmita M.; Patil, Yugandhara M; Joshi, Suraj R; Deobagkar, Deepti D.

doi:10.1007/s12038-018-9781-2

Cited by 33 publications

(25 citation statements)

References 60 publications

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“…PICRUST analysis results obtained in the current study indicated presence of microorganisms harboring genes such as alkB, AlmA, CYP153A and AlkB are enriched in the OMZ in Arabian sea similar to the reports from Atlantic Ocean and Bay of Bengal 51–53 . Presence of hydrocarbon degrading organisms points to presence of alkanes and hydrocarbon.…”

Section: Discussionsupporting

confidence: 87%

Microbial diversity of the Arabian Sea in the Oxygen minimum zones by metagenomics approach

Paingankar

Ahire

Mishra

et al. 2019

Preprint

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23Large oxygen depleted areas known as oxygen minimum zones (OMZ) have been 24 observed in the Arabian Sea and recent reports indicate that these areas are expanding at an 25 alarming rate. In marine waters, oxygen depletion may also be related to global warming 26 and the temperature rise, acidification and deoxygenation can lead to major consequences 27 wherein the plants, fish and other biota will struggle to survive in the ecosystem. 28The current study has identified the microbial community structure using NGS 29 based metagenomics analysis in the water samples collected at different depth from the 30 oxygen depleted and non-OMZ areas of Arabian Sea. Environmental variables such as 31 depth, site of collection and oxygen concentration appeared to influence the species 32 richness and evenness among microbial communities in these locations. Our observations 33 clearly indicate that population dynamics of microbes consisting of nitrate reducers 34 accompanied by sulphate reducers and sulphur oxidizers participate in the interconnected 35 geochemical cycles of the OMZ areas. In addition to providing baseline data related to the 36 diversity and microbial community dynamics in oxygen-depleted water in the OMZ; such 37 analysis can provide insight into processes regulating productivity and ecological 38 community structure of the ocean. 39Keywords: Arabian Sea, bacterial diversity, oxygen minimum zones, metagenomics, 40 sulphur and nitrogen metabolism, Goa, Mangalore, Calicut. 41 42

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Section: Discussionsupporting

confidence: 87%

Microbial diversity of the Arabian Sea in the Oxygen minimum zones by metagenomics approach

Paingankar

Ahire

Mishra

et al. 2019

Preprint

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“…Also, our study has revealed the distinct bacterial diversity of Bay of Bengal when compared to OMZ regions of Peru and Chile. This work also reports the presence of bacteria involved in nitrogen metabolism [62]. Therefore, current analysis with support from the previous studies confirms the presences of nitrate reducing cultivable bacteria in BOB and Arabian Sea areas.…”

Section: Enzyme Assayssupporting

confidence: 89%

Isolation, identification and functional characterization of cultivable bacteria from Arabian Sea and Bay of Bengal water samples reveals high diversity

Rajpathak

Patil

Banerjee

et al. 2020

Preprint

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The oxygen minimum zone of the Arabian Sea (AS) and Bay of Bengal (BOB) is rich in organic matter and is an unusual niche. Bacteria present in the oceanic water play an important role in ecology since they are responsible for decomposing, mineralizing of organic matter and in elemental cycling like nitrogen, sulfur, phosphate. This study focuses on culturing bacteria from oxygen minimum zones (OMZ) and non-OMZ regions and their phylogenetic as well as the functional characterization. Genotypic characterization of the isolates using amplified rDNA based 16SrRNA sequencing grouped them into various phylogenetic groups such as alpha-proteobacteria, gamma-proteobacteria and unaffiliated bacteria. The cultivable bacterial assemblages encountered belonged to the genus Halomonas, Marinobacter, Idiomarina, Pshyctobacter and Pseudoalteromonas. Among the enzymatic activities, carbohydrate utilization activity was most predominant (100%) and microorganisms possessed amylase, cellulase, xylanase and chitinase. A large proportion of these bacteria (60%) were observed to be hydrocarbon consuming and many were resistant to ampicillin, chloramphenicol, kanamycin and streptomycin. The high diversity and high percentage of extracellular hydrolytic enzyme activities along with hydrocarbon degradation activity of the culturable bacteria reflects their important ecological role in oceanic biogeochemical cycling. Further assessment confirmed the presence of nitrogen reduction capability in these cultivable bacteria which highlights their importance in oceanic geochemical cycling.

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“…Large amounts of particulate and dissolved organic matter are characteristic of the watercourses flowing into the Bay of Bengal. Gammaproteobacteria and Alphaproteobacteria dominated the bacterial community composition of the waters of the Bay of Bengal (Ghosh and Bhadury, 2018;Rajpathak et al, 2018;Fernandes et al, 2019;Dhal et al, 2020) and these classes together with Deltaproteobacteria were detected abundantly in sediments of the Sundarbans (Basak et al, 2015). In this study, Deltaproteobacteria were mainly represented by Geobacter at K8 with relevance for the arsenic cycle (Gnanaprakasam et al, 2017).…”

Section: Bacterial Community Composition and Potential Roles Across Tmentioning

confidence: 48%

Vibrio and Bacterial Communities Across a Pollution Gradient in the Bay of Bengal: Unraveling Their Biogeochemical Drivers

et al. 2020

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The highly populated coasts of the Bay of Bengal are particularly vulnerable to water-borne diseases, pollution and climatic extremes. The environmental factors behind bacterial community composition and Vibrio distribution were investigated in an estuarine system of a cholera-endemic region in the coastline of Bangladesh. Higher temperatures and sewage pollution were important drivers of the abundance of toxigenic Vibrio cholerae. A closer relation between non-culturable Vibrio and particulate organic matter (POM) was inferred during the post-monsoon. The distribution of operational taxonomic units (OTUs) of Vibrio genus was likely driven by salinity and temperature. The resuspension of sediments increased Vibrio abundance and organic nutrient concentrations. The δ 13 C dynamic in POM followed an increasing gradient from freshwater to marine stations; nevertheless, it was not a marker of sewage pollution. Bacteroidales and culturable coliforms were reliable indicators of untreated wastewater during pre and post-monsoon seasons. The presumptive incorporation of depletedammonium derived from ammonification processes under the hypoxic conditions, by some microorganisms such as Cloacibacterium and particularly by Arcobacter nearby the sewage discharge, contributed to the drastic 15 N depletion in the POM. The likely capacity of extracellular polymeric substances production of these taxa may facilitate the colonization of POM from anthropogenic origin and may signify important properties for wastewater bioremediation. Genera of potential pathogens other than Vibrio associated with sewage pollution were Acinetobacter, Aeromonas, Arcobacter, and Bergeyella.

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An exploration of microbial and associated functional diversity in the OMZ and non-OMZ areas in the Bay of Bengal

Cited by 33 publications

References 60 publications

Microbial diversity of the Arabian Sea in the Oxygen minimum zones by metagenomics approach

Microbial diversity of the Arabian Sea in the Oxygen minimum zones by metagenomics approach

Isolation, identification and functional characterization of cultivable bacteria from Arabian Sea and Bay of Bengal water samples reveals high diversity

Vibrio and Bacterial Communities Across a Pollution Gradient in the Bay of Bengal: Unraveling Their Biogeochemical Drivers

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