Anthropogenic and Environmental Constraints on the Microbial Methane Cycle in Coastal Sediments

Frontiers in Microbiology, Journal Year: 2021, Volume and Issue: 12

Published: Feb. 18, 2021

Large amounts of methane, a potent greenhouse gas, are produced in anoxic sediments by methanogenic archaea. Nonetheless, over 90% the methane is oxidized via sulfate-dependent anaerobic oxidation (S-AOM) sulfate-methane transition zone (SMTZ) consortia methane-oxidizing archaea (ANME) and sulfate-reducing bacteria (SRB). Coastal systems account for majority total marine emissions typically have lower sulfate concentrations, hence S-AOM less significant. However, alternative electron acceptors such as metal oxides or nitrate could be used AOM instead sulfate. The availability determined redox zonation sediment, which may vary due to changes oxygen type rate organic matter inputs. Additionally, eutrophication climate change can affect microbiome, biogeochemical zonation, cycling coastal sediments. This review summarizes current knowledge on processes microorganisms involved factors influencing from these systems. In eutrophic areas, inputs key driver bottom water hypoxia. Global warming reduce solubility surface waters, enhancing column stratification, increasing primary production, favoring methanogenesis. ANME notoriously slow growers not able effectively oxidize upon rapid sedimentation shoaling SMTZ. settings, ANME-2d ( Methanoperedenaceae ) ANME-2a couple iron- and/or manganese reduction AOM, while NC10 Methylomirabilota nitrite reduction. Ultimately, aerobic methanotrophs upper millimeters sediment column. role mitigating sediments, including exact pathways involved, still underexplored, controlling unclear. Further studies needed order understand driving methane-cycling identify responsible microorganisms. Integration microbial geochemical expected lead more accurate predictions zones future.

Language: Английский

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Roles of Thermokarst Lakes in a Warming World

Trends in Microbiology, Journal Year: 2020, Volume and Issue: 28(9), P. 769 - 779

Published: April 30, 2020

Thermokarst lakes form as a result of permafrost thaw in predominantly ice-rich yedoma deposits and are therefore an ecosystem that is rapidly expanding with the onset climate change.Thermokarst net greenhouse gas sources century-old carbon become bioavailable mineralized to CO2 CH4.CH4 more potent than CO2. Changed dynamics will disproportionately affect global warming.Methane emissions methane production by methanogenesis oxidation aerobic bacteria or anaerobic archaea, high levels heterogeneity intricate interactions.Future change have disproportionate effects on Arctic, which implies potentially strong consequences for future fluxes progression. Permafrost covers quarter northern hemisphere land surface contains twice amount currently present atmosphere. Future expected reduce its near-surface cover over 90% end 21st century, leading thermokarst lake formation. point dioxide release long-term stocks into atmosphere, thereby initiating positive feedback contributing up 0.39°C rise air temperatures 2300. This review describes potential role warming world microbial mechanisms underlie their contributions budget. [1.Gruber S. Derivation analysis high-resolution estimate zonation.Cryosphere. 2012; 6: 221-233Crossref Scopus (171) Google Scholar,2.Camill P. accelerates boreal peatlands during late-20th century warming.Clim. Change. 2005; 68: 135-152Crossref (131) Scholar]. 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Language: Английский

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Subduction hides high-pressure sources of energy that may feed the deep subsurface biosphere

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 5, 2020

Abstract Geological sources of H 2 and abiotic CH 4 have had a critical role in the evolution our planet development life sustainability deep subsurface biosphere. Yet origins these are largely unconstrained. Hydration mantle rocks, or serpentinization, is widely recognized to produce favour genesis shallow settings. However, deeper missing from current models, which mainly invoke more oxidized fluids at convergent margins. Here we combine data exhumed subduction zone high-pressure rocks thermodynamic modelling show that serpentinization (40–80 km) generates significant amounts , as well S NH 3 . Our results suggest subduction, worldwide, hosts large potentially providing energy overlying biosphere forearc regions

Language: Английский

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Roles and opportunities for microbial anaerobic oxidation of methane in natural and engineered systems

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(9), P. 4803 - 4830

Published: Jan. 1, 2021

Anaerobic oxidation of methane (AOM) is a crucial bioprocess in global mitigation. Adoption AOM an engineered system provides opportunity for the development methane-based biotechnologies.

Language: Английский

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Verrucomicrobial methanotrophs: ecophysiology of metabolically versatile acidophiles

FEMS Microbiology Reviews, Journal Year: 2021, Volume and Issue: 45(5)

Published: Jan. 15, 2021

Methanotrophs are an important group of microorganisms that counteract methane emissions to the atmosphere. Methane-oxidising bacteria Alpha- and Gammaproteobacteria have been studied for over a century, while methanotrophs phylum Verrucomicrobia more recent discovery. Verrucomicrobial extremophiles live in very acidic geothermal ecosystems. Currently, than dozen strains isolated, belonging genera Methylacidiphilum Methylacidimicrobium. Initially, these were thought be metabolically confined. However, genomic analyses physiological biochemical experiments past years revealed verrucomicrobial methanotrophs, as well proteobacterial much versatile previously assumed. Several inorganic gases other molecules present ecosystems can utilised, such methane, hydrogen gas, carbon dioxide, ammonium, nitrogen gas perhaps also sulfide. could therefore represent key players multiple volcanic nutrient cycles mitigation greenhouse from Here, we summarise current knowledge on with respect their metabolic versatility discuss factors determine diversity natural environment. In addition, metabolic, morphological ecological characteristics reviewed.

Language: Английский

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The anaerobic oxidation of methane in paddy soil by ferric iron and nitrate, and the microbial communities involved

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 788, P. 147773 - 147773

Published: May 15, 2021

Language: Английский

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Sulfur Biogeochemical Cycle of Marine Sediments

Geochemical Perspectives, Journal Year: 2021, Volume and Issue: unknown, P. 145 - 307

Published: Oct. 1, 2021

Complex interactions between microbial communities and geochemical processes drive the major element cycles control function of marine sediments as a dynamic reservoir organic matter. Sulfate reduction is globally dominant pathway anaerobic mineralisation main source sulfide. The effective re-oxidation this sulfide at direct or indirect expense oxygen prerequisite for aerobic life on our planet. Although largely hidden beneath oxic sediment surface, sulfur cycle therefore critical Earth’s redox state. This Geochemical Perspectives begins with brief primer description my own scientific journey through nearly fifty years studies geochemistry microbiology. Among objectives these were to quantify identify behind them. Radiotracers in combination chemical analyses have thereby been used extensively laboratory experiments, supported by diverse molecular microbiological methods. following sections discuss sulfate reduction, oxidation disproportionation inorganic intermediates, especially elemental thiosulfate. experimental approaches enable analysis how environmental factors such substrate concentration temperature affect process rates concurrent cryptic cycle. energy chemolithotrophic bacteria, including fascinating big bacteria cable supports their dark CO2 fixation, which produces new biomass. During burial aging sediments, predominant change cascade reactions, rate matter degradation drops continuously over many orders magnitude. pathways age turnover are discussed. In deep methanic zone, only few percent entire remains, provides small boost methane oxidation. stable isotopes provide an additional tool understand diagenetic processes, whereby isotope fractionation open system diagenesis generate differential diffusion flux isotopes. relation carbon seabed contribution methane, paper discusses global budget role different depth regions ocean – from coast sea. published estimates parameters evaluated compared. Finally, looks future perspectives respect gaps current understanding need further studies.

Language: Английский

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Anaerobic microbial manganese oxidation and reduction: A critical review

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 822, P. 153513 - 153513

Published: Jan. 29, 2022

Language: Английский

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Simultaneous nitrate and sulfate dependent anaerobic oxidation of methane linking carbon, nitrogen and sulfur cycles

Water Research, Journal Year: 2021, Volume and Issue: 194, P. 116928 - 116928

Published: Feb. 15, 2021

Language: Английский

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Antimony redox processes in the environment: A critical review of associated oxidants and reductants

Journal of Hazardous Materials, Journal Year: 2022, Volume and Issue: 431, P. 128607 - 128607

Published: March 1, 2022

Language: Английский

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