Response mechanism of microbial community to seasonal hypoxia in marine ranching

The Science of The Total Environment, Год журнала: 2021, Номер 811, С. 152387 - 152387

Опубликована: Дек. 13, 2021

Язык: Английский

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Biogeochemistry of Marine Oxygen Minimum Zones with Special Emphasis on the Northern Indian Ocean

Опубликована: Апрель 1, 2022

Oxygen minimum zones (OMZs) enclose O 2 depleted subsurface water masses in the global ocean extending approximately 150 to 1200 m below sea level. The most pronounced OMZs occur Eastern Tropical North Pacific off Mexico and California (ETNP), South Peru Chile (ETSP), Arabian Sea (AS) defined by secondary nitrite maxima attributed intense denitrification column. These sites are critical for biogeochemical processes that control biodiversity primary productivity of ocean. preservation organic carbon is efficient within sediments underlying oxygen-depleted waters as a result incomplete decomposition it sinks through column diminished bioturbation activity. partially degraded (reactive) matter fuels microbe-mediated anoxic marine where sulfate reduction significant remineralization pathway. exert strong influence on abundance, diversity, composition microbial communities. Recent geochemical environmental genomic studies identified prevalence C, N, S cycles OMZs. Here, we review progress current understanding C–S–N cycle OMZ with regard its biogeochemistry ecology, present brief account mechanism formation northern Indian Ocean.

Язык: Английский

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Extremely oligotrophic and complex-carbon-degrading microaerobic bacteria from Arabian Sea oxygen minimum zone sediments

Archives of Microbiology, Год журнала: 2024, Номер 206(4)

Опубликована: Март 18, 2024

Язык: Английский

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Bacterial Dynamics in the Northern Indian Ocean Region: Understanding from the Pre-genomics to Present-Day OMICS Era

Geomicrobiology Journal, Год журнала: 2024, Номер unknown, С. 1 - 12

Опубликована: Дек. 13, 2024

The Northern Indian Ocean (NIO) is one of the most characteristic regions world oceans with diverse oceanographic features. Understanding microbial community structure in these unique habitats has rapidly increased last decade, especially advent molecular tools and application NGS technologies. Studies on marine ecology NIO regions, from pre-genomics era relied culture techniques, microscopic observations, qualitative plate assays biochemical tests. Molecular techniques 16S rRNA gene sequencing introduced after late 1990s significantly enhanced understanding bacterial diversity. These revealed presence phyla provided insights into their functional characteristics. Recent, NGS-based metagenomic studies further expanded structures, oxygen minimum zones deep-sea sediments. have identified taxa in-depth, revealing existence numerous Candidatus known only by genomic makeup. Despite advancements, a large part diversity remains unexplored, many unanswered questions related to carbon pump. Further transcriptome based can greatly improve processes NIO, which dynamic, habitat.

Язык: Английский

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Short-term sedimentary evidence for increasing diatoms in Arctic fjords in a warming world

The Science of The Total Environment, Год журнала: 2024, Номер 951, С. 175757 - 175757

Опубликована: Авг. 28, 2024

Язык: Английский

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Benthic methane fluxes and oxidation over the Western Indian Shelf: No evidence of pelagic methanotrophic denitrification

Marine Environmental Research, Год журнала: 2024, Номер 205, С. 106922 - 106922

Опубликована: Дек. 25, 2024

Язык: Английский

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Deep Subsurface Microbiomes of the Marine Realm

Опубликована: Апрель 1, 2022

The oceans cover ~71% of the Earth's surface, so their sediments constitute one largest biomes planet. Moreover, marine deep subsurface is not only a colossal microbial habitat but also most enigmatic and difficult to explore microbiomes on Earth. Albeit cell density in manifold lower than surficial ecosystems, sheer vastness dark extremities biosphere makes them reservoir organic carbon. progressively carbon impoverished energy-limited poses unique set physicochemical challenges (including high temperature mechanical pressure) metabolism, notwithstanding which replete with life activity, often up several hundreds meters below seafloor. last few decades have witnessed quantum leaps our understanding microbiology realm, tune that aspects pertaining physiology, adaptation, evolution, astrobiology been reviewed extensively. Here, we compile all information available for situ processes geochemical manifestations typical geological features such as gas hydrate deposits, mud volcanoes carbonate mounds) aim visualize comprehensive biogeochemical picture ecosystem functioning subsurface.

Язык: Английский

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Sedimentary Structures of Tidal Flats in Recent Chandipur East Coast of Odisha, India

Springer eBooks, Год журнала: 2023, Номер unknown, С. 275 - 291

Опубликована: Янв. 1, 2023

Язык: Английский

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Spatio-temporal variation of bacterial community structure in two intertidal sediment types of Jiaozhou Bay

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Май 24, 2023

Abstract The intertidal sediment environment is dynamic and the biofilm bacterial community within it must constantly adjust, but an understanding of differences in sediments different types still relatively limited. In this study, structure Jiaozhou Bay biofilms are described using high-throughput 16S rRNA gene sequencing effects temporal change discussed. Shannon index was significantly higher sandy samples than muddy samples. co-occurrence network tighter more species were involved building principal coordinates analysis identified a significant separation between stations (LiCun estuary, LC ZhanQiao Pier, ZQ). Proteobacteria, which had relative abundance approximately 50% at all phylum levels, abundant ZQ, while Campilobacterota Firmicutes LC. abundances Bacteroidetes, Campilobacterota, Firmicutes, Chloroflexi samples, Actinobacteria Proteobacteria There phylum-level biomarkers stations. also patterns functional enrichment biogeochemical cycles with former having families that differed significantly, highlighting their greater role determining function. RDA results, where each month’s concentrated individually, showed reduced variation months when amplicon sequence variant replaced by KEGG orthologs, presumably impact on shaping community, although less clear family level. Random forest prediction yielded combination 43 family-level features responded well to change, reflecting influence bacteria. Highlights Sandy have building. Different substrates from own biomarkers. Substrates Temporal changes power bacteria families. Graphic abstract

Язык: Английский

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Extremely oligotrophic and complex carbon degrading microaerobic bacteria from Arabian Sea oxygen minimum zone sediments

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Ноя. 1, 2023

ABSTRACT Sediments underlying marine hypoxic zones are huge sinks of unreacted complex organic matter, where despite acute O 2 -limitation obligately aerobic bacteria thrive, and steady depletion carbon takes place within a few meters below the seafloor. However, little knowledge exists about sustenance degradation potentials chemoorganotrophs in these sulfidic ecosystems. We isolated characterized number bacterial chemoorganoheterotrophs from across ∼3 m sediment horizon perennial zone eastern Arabian Sea. High levels sequence correspondence between isolates’ genomes habitat’s metagenomes metatranscriptomes illustrated that strains were widespread active sediment-cores explored. The isolates catabolized several compounds terrestrial origins presence high or low, but not zero, . Some them could also grow anaerobically on yeast extract acetate by reducing nitrate and/or nitrite. Fermentation did support growth, enabled all to maintain fraction their cell populations over prolonged anoxia. Under extreme oligotrophy, limited growth followed protracted stationary phase was observed for at low density, amid concentration. While population control maintenance be particularly useful strains’ survival critically carbon-depleted layers explored sediment-depths (core-bottom carbon: 0.5-1.0 % w/w), metagenomic data suggested situ anoxia surmounted via potential supplies cryptic previously-reported sources such as Nitrosopumilus species.

Язык: Английский

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