Distinct microbial populations are tightly linked to the profile of dissolved iron in the methanic sediments of the Helgoland mud area, North Sea

Oni, Oluwatobi Emmanuel; Miyatake, Tetsuro; Kasten, Sabine; Richter-Heitmann, Tim; Fischer, David; Wagenknecht, Laura; Kulkarni, Ajinkya; Blumers, M.; Shylin, Sergii I.; Ksenofontov, Vadim; Costa, B.F.O.; Klingelhöfer, G.; Friedrich, Michael W.

doi:10.3389/fmicb.2015.00365

Cited by 71 publications

(108 citation statements)

References 78 publications

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“…However, organisms responsible for metal-dependent AOM were not identified in these studies. It was speculated that JS1 bacteria, methanogenic archaea, and Methanohalobium /ANME-3 could be responsible for iron-dependent AOM [138]. Other researchers speculated that either ANME-1 or Methanococcoides /ANME-3 together with a bacterial partner were responsible for manganese-dependent AOM [139].…”

Section: Respiration During Anaerobic Oxidation Of Methanementioning

confidence: 99%

Reverse Methanogenesis and Respiration in Methanotrophic Archaea

Timmers

Welte

Koehorst

et al. 2017

Archaea

262

196

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Anaerobic oxidation of methane (AOM) is catalyzed by anaerobic methane-oxidizing archaea (ANME) via a reverse and modified methanogenesis pathway. Methanogens can also reverse the methanogenesis pathway to oxidize methane, but only during net methane production (i.e., “trace methane oxidation”). In turn, ANME can produce methane, but only during net methane oxidation (i.e., enzymatic back flux). Net AOM is exergonic when coupled to an external electron acceptor such as sulfate (ANME-1, ANME-2abc, and ANME-3), nitrate (ANME-2d), or metal (oxides). In this review, the reversibility of the methanogenesis pathway and essential differences between ANME and methanogens are described by combining published information with domain based (meta)genome comparison of archaeal methanotrophs and selected archaea. These differences include abundances and special structure of methyl coenzyme M reductase and of multiheme cytochromes and the presence of menaquinones or methanophenazines. ANME-2a and ANME-2d can use electron acceptors other than sulfate or nitrate for AOM, respectively. Environmental studies suggest that ANME-2d are also involved in sulfate-dependent AOM. ANME-1 seem to use a different mechanism for disposal of electrons and possibly are less versatile in electron acceptors use than ANME-2. Future research will shed light on the molecular basis of reversal of the methanogenic pathway and electron transfer in different ANME types.

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Section: Respiration During Anaerobic Oxidation Of Methanementioning

confidence: 99%

Reverse Methanogenesis and Respiration in Methanotrophic Archaea

Timmers

Welte

Koehorst

et al. 2017

Archaea

262

196

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“…These two samples were located in mine adit (HX01) and downstream (HX04). In comparison, FeOX2 (crystalline Fe(oxyhydr)oxides, mainly goethite and hematite) and FeMag (crystalline Fe(oxyhydr)oxides, mainly magnetite and maghemite) (Oni et al 2015) accounted for smaller portion of Fetot. FeCarb containing adsorbed Fe and Fe carbonates was most abundant in HX04 (69.9 ± 0.1 mg/g, downstream), HX01 (50.8 ± 0.4 mg/g, mine adit), and CS04 (40.1 ± 0.2 mg/g, contaminated soil) but was relatively lower in other samples.…”

Section: Sequential Fe Extractionmentioning

confidence: 98%

“…The concentrations of four Fe-extractable fractions did not demonstrate a clear site-specific pattern. Among the four Fe-extractable fractions, FeOX1, referring to amorphous and crystalline Fe (mainly ferrihydrite and lepidocrocite) (Oni et al 2015), was most abundant. FeOX1 exhibited relatively high concentrations (>80 mg/ g) in ten samples, but lower in HX01 (9.5 ± 0.9 mg/g) and HX04 (9.2 ± 0.1 mg/g).…”

Section: Sequential Fe Extractionmentioning

confidence: 99%

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Characterization of the microbial community composition and the distribution of Fe-metabolizing bacteria in a creek contaminated by acid mine drainage

Sun

Xiao

Krumins

et al. 2016

Appl Microbiol Biotechnol

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A small watershed heavily contaminated by long-term acid mine drainage (AMD) from an upstream abandoned coal mine was selected to study the microbial community developed in such extreme system. The watershed consists of AMD-contaminated creek, adjacent contaminated soils, and a small cascade aeration unit constructed downstream, which provide an excellent contaminated site to study the microbial response in diverse extreme AMD-polluted environments. The results showed that the innate microbial communities were dominated by acidophilic bacteria, especially acidophilic Fe-metabolizing bacteria, suggesting that Fe and pH are the primary environmental factors in governing the indigenous microbial communities. The distribution of Fe-metabolizing bacteria showed distinct site-specific patterns. A pronounced shift from diverse communities in the upstream to Proteobacteria-dominated communities in the downstream was observed in the ecosystem. This location-specific trend was more apparent at genus level. In the upstream samples (sampling sites just below the coal mining adit), a number of Fe(II)-oxidizing bacteria such as Alicyclobacillus spp., Metallibacterium spp., and Acidithrix spp. were dominant, while Halomonas spp. were the major Fe(II)-oxidizing bacteria observed in downstream samples. Additionally, Acidiphilium, an Fe(III)-reducing bacterium, was enriched in the upstream samples, while Shewanella spp. were the dominant Fe(III)-reducing bacteria in downstream samples. Further investigation using linear discriminant analysis (LDA) effect size (LEfSe), principal coordinate analysis (PCoA), and unweighted pair group method with arithmetic mean (UPGMA) clustering confirmed the difference of microbial communities between upstream and downstream samples. Canonical correspondence analysis (CCA) and Spearman's rank correlation indicate that total organic carbon (TOC) content is the primary environmental parameter in structuring the indigenous microbial communities, suggesting that the microbial communities are shaped by three major environmental parameters (i.e., Fe, pH, and TOC). These findings were beneficial to a better understanding of natural attenuation of AMD.

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“…According to the classic reduction scheme in marine sediment based on theoretical calculations of energy yields, iron reduction has been thought to be limited to anoxic sediments above the SMTZ and only methanogenesis is thought to occur below the SMTZ (e.g., Berner, 1981;Emerson and Hedges, 2006). A more recent study, however, has indicated that microbial Fe reduction of iron minerals in the methanogenesis zone below the SMTZ and the release of Fe 2+ into porewater are possible (Oni et al, 2015). Indeed, the dissolved Fe concentrations in porewater below the SMTZ at Sites U1343 and U1344 imply that dissimilatory iron reduction occurs below the SMTZ.…”

Section: Fe(iii) Reduction In Clay Minerals Below the Sulfate-methanementioning

confidence: 99%

Low-Temperature Clay Mineral Dehydration Contributes to Porewater Dilution in Bering Sea Slope Subseafloor

et al. 2018

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Widespread diagenesis of clay minerals occurs in deeply buried marine sediments under high-temperature and high-pressure conditions. For example, the smectite-to-illite (S-I) transformation has been often observed in sediments at in situ temperatures above ∼60 • C. However, it remains largely unknown whether such diagenetic processes naturally occur in relatively shallow and low-temperature sediments and, if so, what the consequences are of any related chemical reactions to the geochemical characteristics in the deep biosphere. We evaluated the possibility of naturally occurring S-I transformation at temperatures below 40 • C in continental slope sediments of the Bering Sea by examining porewater chemistry, clay mineralogy, and chemical composition of clay minerals measured to ∼800 m beneath the seafloor (mbsf) in core samples acquired during Integrated Ocean Drilling Program Expedition 323. In porewater from these cores, chloride concentrations decreased with increasing depth from 560 mM near the seafloor to 500 mM at ∼800 mbsf; δ 18 O increased from 0 to 1.5‰; and δD decreased from −1 to −9‰. These trends are consistent with the addition of water derived from S-I transformation. The discrete low Cl − spikes observed between ∼200 and ∼450 mbsf could be attributed to the dissociation of methane hydrate. X-ray diffraction analysis of the clay-size fraction (<2 µm) showed an increase of illite content in the I/S mixed layer with increasing depth to 150 mbsf. This increase may imply the occurrence of S-I transformation. The decrease of Fe 3+ /Fe 2+ in the clay-size fraction with increasing depth strongly suggests microbial reduction of Fe(III) in clay minerals with burial, which also has the potential to promote the S-I transformation. Our results imply the significant ecological roles on the diagenesis of siliciclastic clay minerals underlying the high-productivity surface seawater at continental margins.

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Distinct microbial populations are tightly linked to the profile of dissolved iron in the methanic sediments of the Helgoland mud area, North Sea

Cited by 71 publications

References 78 publications

Reverse Methanogenesis and Respiration in Methanotrophic Archaea

Reverse Methanogenesis and Respiration in Methanotrophic Archaea

Characterization of the microbial community composition and the distribution of Fe-metabolizing bacteria in a creek contaminated by acid mine drainage

Low-Temperature Clay Mineral Dehydration Contributes to Porewater Dilution in Bering Sea Slope Subseafloor

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