Sediment oxygen consumption: Role in the global marine carbon cycle

Earth-Science Reviews, Journal Year: 2022, Volume and Issue: 228, P. 103987 - 103987

Published: March 12, 2022

The seabed plays a key role in the marine carbon cycle as a) terminal location of aerobic oxidation organic matter, b) greatest anaerobic bioreactor, and c) repository for reactive on Earth. We compiled data oxygen uptake sediments with objective to understand constraints mineralization rates deposited matter their relation environmental parameters. database includes nearly 4000 O2 is available supplementary material. It also information bottom water concentration, penetration depth, geographic position, full sources. present different situ ex approaches measure total (TOU) diffusive (DOU) discuss robustness towards methodological errors statistical uncertainty. transport through benthic boundary layers, diffusion- fauna-mediated uptake, coupling respiration processes. Five regional examples are presented illustrate diversity seabed: Eutrophic seas, minimum zones, abyssal plains, mid-oceanic gyres, hadal trenches. A multiple correlation analysis shows that primarily controlled by ocean depth sea surface primary productivity. scales DOU according power law breaks down under gyres. developed model was used draw global map rates. Respiratory coefficients, differentiated regions ocean, were convert oxidation. resulting budget an 212 Tmol C yr−1 5-95% confidence interval 175-260 yr−1. comparison flux particulate (POC) from photic waters deep sea, determined sediment trap studies, suggests deficit sedimentation at 2000 m about 70% relative turnover underlying seabed. At margins, rivers vegetated coastal ecosystems contributes greatly may even exceed phytoplankton production inner continental shelf.

Language: Английский

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Global diversity and inferred ecophysiology of microorganisms with the potential for dissimilatory sulfate/sulfite reduction

FEMS Microbiology Reviews, Journal Year: 2023, Volume and Issue: 47(5)

Published: Sept. 1, 2023

Sulfate/sulfite-reducing microorganisms (SRM) are ubiquitous in nature, driving the global sulfur cycle. A hallmark of SRM is dissimilatory sulfite reductase encoded by genes dsrAB. Based on analysis 950 mainly metagenome-derived dsrAB-carrying genomes, we redefine diversity with potential for sulfate/sulfite reduction and uncover genetic repertoires that challenge earlier generalizations regarding their mode energy metabolism. We show: (i) 19 out 23 bacterial 2 4 archaeal phyla harbor uncharacterized SRM, (ii) four including Desulfobacterota to switch between oxidation, (iii) combination as well presence/absence different dsrAB-types, dsrL-types dsrD provides guidance inferred direction further provide an updated dsrAB database > 60% taxonomically resolved, uncultured family-level lineages recommendations existing dsrAB-targeted primers environmental surveys. Our work summarizes insights into ecophysiology newly discovered puts context major recent changes taxonomy, up-to-date framework study a context.

Language: Английский

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Oxygen respiration and polysaccharide degradation by a sulfate-reducing acidobacterium

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 10, 2023

Sulfate-reducing microorganisms represent a globally important link between the sulfur and carbon cycles. Recent metagenomic surveys expanded diversity of putatively involved in sulfate reduction underscoring our incomplete understanding this functional guild. Here, we use genome-centric metatranscriptomics to study energy metabolism Acidobacteriota that carry genes for dissimilation compounds long-term continuous culture running under alternating anoxic oxic conditions. Differential gene expression analysis reveals unique metabolic flexibility pectin-degrading acidobacterium switch from oxygen when shifting The combination facultative anaerobiosis polysaccharide degradation expands versatility among sulfate-reducing microorganisms. Our results highlight aerobic respiration are not mutually exclusive same organism, reducers can mineralize organic polymers, anaerobic mineralization complex matter is necessarily multi-step process involving different microbial guilds but be bypassed by single species.

Language: Английский

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Drivers of methane-cycling archaeal abundances, community structure, and catabolic pathways in continental margin sediments

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: Feb. 6, 2025

Marine sediments contain Earth's largest reservoir of methane, with most this methane being produced and consumed in situ by methane-cycling archaea. While numerous studies have investigated communities archaea hydrocarbon seeps sulfate-methane transition zones, less is known about how these change from the seafloor downward throughout diffusion-dominated marine sediments. Focusing on four continental margin sites North Sea-Baltic Sea transition, we here investigate drivers archaeal community structure metabolism based geochemical stable carbon-isotopic gradients, functional gene (mcrA) copy numbers phylogenetic compositions, thermodynamic calculations. We observe major changes that largely follow vertical gradients sulfate concentrations lateral organic carbon reactivity content. bioturbated sulfatic zones are dominated methyl-disproportionating Methanosarcinaceae putatively CO2-reducing Methanomicrobiaceae, toward dominance methane-oxidizing taxa (ANME-2a-b, ANME-2c, ANME-1a-b) (SMTZs). By contrast, underlying methanogenesis physiologically uncharacterized ANME-1d, new genus-level groups methyl-reducing Methanomassiliicoccales. Notably, mcrA several increase 2 to 4 orders magnitude zone into SMTZ or methanic zone, providing evidence net population growth subsurface sediment. propose burial-related cause go through three successional stages (sulfatic, SMTZ, methanic). Herein, onset each stage characterized a period growth- mortality-driven turnover dominant taxa.

Language: Английский

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Comprehensive Nontargeted Analysis of Drinking Water Supplies to Identify Chemicals Associated with Estrogen Receptor Agonism or Present in Regions of Elevated Breast Cancer Occurrence

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

To explore the hypothesis that differential exposures to estrogen active chemicals may contribute regional disparities in cancer incidence, a comprehensive targeted and nontargeted analysis was conducted over two seasons (2020) for drinking water samples from 120 households served by 8 public systems (4 with historically elevated breast incidence) 15 brands of retail water. All were analyzed using gas liquid chromatography high-resolution mass spectrometry bioassay receptor agonism. Target compounds included disinfection byproducts, per- polyfluoroalkyl substances (PFAS), trace elements, selected their possible relation cancer. Over 7500 GC LC molecular features passed all quality control filters each sampling season prioritized identification if they related measured agonism or present at higher levels areas high incidence (n = 1036). Benzothiazole-2-sulfonic acid, acetyl tributyl citrate, diphenyl sulfone among confirmed nontarget compounds. Nine polycyclic aromatic hydrocarbons ketone derivatives displayed significant negative correlations Many remained unidentified, as 84.4% 77.5% could not be annotated confidence.

Language: Английский

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What Controls the Sulfur Isotope Fractionation during Dissimilatory Sulfate Reduction?

ACS Environmental Au, Journal Year: 2023, Volume and Issue: 3(2), P. 76 - 86

Published: Jan. 3, 2023

Sulfate often behaves conservatively in the oxygenated environments but serves as an electron acceptor for microbial respiration a wide range of natural and engineered systems where oxygen is depleted. As ubiquitous anaerobic dissimilatory pathway, therefore, reduction sulfate to sulfide has been continuing interest field microbiology, ecology, biochemistry, geochemistry. Stable isotopes sulfur are effective tool tracking this catabolic process microorganisms discriminate strongly against heavy when cleaving sulfur–oxygen bond. Along with its high preservation potential environmental archives, variation isotope effects can provide insights into physiology reducing across temporal spatial barriers. A vast array parameters, including phylogeny, temperature, rate, availability sulfate, donor, other essential nutrients, explored possible determinant magnitude fractionation, there now broad consensus that relative donors primarily controls fractionation. ratio shifts toward fractionation increases. The results conceptual models, centered on reversibility each enzymatic step qualitative agreement observations, although underlying intracellular mechanisms translate external stimuli isotopic phenotype remain largely unexplored experimentally. This minireview offers snapshot our current understanding during well their quantitative applications. It emphasizes importance model system investigation respiratory pathways utilize oxyanions terminal acceptors.

Language: Английский

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Microbial Sulfate Reduction and Its Role in Carbon Sequestration in Marine Sediments

Journal of Earth Science, Journal Year: 2024, Volume and Issue: 35(4), P. 1378 - 1381

Published: June 26, 2024

Language: Английский

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Sedimentary pyrites and C/S ratios of mud sediments on the East China Sea inner shelf indicate late Pleistocene-Holocene environmental evolution

Marine Geology, Journal Year: 2022, Volume and Issue: 450, P. 106854 - 106854

Published: June 16, 2022

Language: Английский

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Sulfate triple-oxygen-isotope evidence confirming oceanic oxygenation 570 million years ago

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: July 18, 2023

The largest negative inorganic carbon isotope excursion in Earth's history, namely the Ediacaran Shuram Excursion (SE), closely followed by early animal radiation, has been widely interpreted as a consequence of oceanic oxidation. However, primary nature signature, source oxidants, and tempo event remain contested. Here, we show that carbonate-associated sulfate (CAS) from three different paleocontinents all have conspicuous 17O anomalies (Δ'17OCAS values down to -0.53‰) during SE. Furthermore, Δ'17OCAS varies correlation with its corresponding δ34SCAS δ18OCAS well carbonate δ13Ccarb, decreasing initially recovery over ~7-Myr SE duration. In box-model examination, argue for period sustained water-column ventilation consequently enhanced sulfur oxidation ocean. Our findings reveal direct involvement mass-anomalously 17O-depleted atmospheric O2 marine formation thus global oxygenation

Language: Английский

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Sulfate distribution and sulfate reduction in global marine sediments

Geochimica et Cosmochimica Acta, Journal Year: 2023, Volume and Issue: 364, P. 79 - 88

Published: Nov. 23, 2023

The quantification of anaerobic oxidation organic matter in the global seabed is to a large extent based on transport-reaction modeling pore water ions involved mineralization processes. As predominant these processes, sulfate reduction can be modeled from depth distribution and other relevant solutes. An active organoclastic typically characterized by profiles with concave-down shape. We use here comprehensive database show that half all competent have an opposite, concave-up shape, which may appear inconsistent this concept. also there strong discrepancy between obtained gravity coring IODP coring, generally much higher flux shallower penetration cores (the term covers international ocean drilling programs, DSDP, ODP IODP). correlated selectivity for sites published studies, focused towards margins continental shelf high surface productivity sedimentation rate. In contrast, more frequently done low regions largely absent shelf. result, estimates biased selection only core data modeling. Furthermore, shows net rates reduction, while 35S-radiotracer experiments gross process. Estimates measurements suggest dissimilatory oxidizes 77 Tmol yr-1 carbon globally, 3- 4-fold than recent data. potential biases marine sediments are discussed.

Language: Английский

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