Nitrate‐ and nitrite‐dependent anaerobic oxidation of methane

Welte, Cornelia U.; Rasigraf, Olivia; Vaksmaa, Annika; Versantvoort, Wouter; Arshad, Ayesha; Camp, Huub J. M. Op den; Jetten, Mike S. M.; Lüke, Claudia; Reimann, Joachim

doi:10.1111/1758-2229.12487

Cited by 162 publications

(106 citation statements)

References 116 publications

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“…Monooxygenases are enzymes involved in cellular metabolism that require oxygen. Monooxygenases are usually encoded by aerobic and facultatively anaerobic microbes, with a notable exception being the methane monooxygenase found in the anaerobic denitrifier ‘Candidatus Methylomirabilis oxyfera ’ 75 . But, no OTUs related to ‘Candidatus Methylomirabilis oxyfera ’ were detected in our 16S rRNA gene dataset indicating it did not contribute to the monooxygenases detected in the metagenomes.…”

Section: Resultsmentioning

confidence: 99%

Climate oscillations reflected within the microbiome of Arabian Sea sediments

Orsi

Coolen

Wuchter

et al. 2017

Sci Rep

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Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial. In sediments underlying the Arabian Sea oxygen minimum zone (OMZ), we performed the first metagenomic profiling of sedimentary DNA at centennial-scale resolution in the context of a multi-proxy paleoclimate reconstruction. While vertical distributions of sulfate reducing bacteria and methanogens indicate energy-based selection typical of anoxic marine sediments, 5–15% of taxa per sample exhibit depth-independent stratigraphies indicative of paleoenvironmental selection over relatively short geological timescales. Despite being vertically separated, indicator taxa deposited under OMZ conditions were more similar to one another than those deposited in bioturbated intervals under intervening higher oxygen. The genomic potential for denitrification also correlated with palaeo-OMZ proxies, independent of sediment depth and available nitrate and nitrite. However, metagenomes revealed mixed acid and Entner-Dourdoroff fermentation pathways encoded by many of the same denitrifier groups. Fermentation thus may explain the subsistence of these facultatively anaerobic microbes whose stratigraphy follows changing paleoceanographic conditions. At least for certain taxa, our analysis provides evidence of their paleoenvironmental selection over the last glacial-interglacial cycle.

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Section: Resultsmentioning

confidence: 99%

Climate oscillations reflected within the microbiome of Arabian Sea sediments

Orsi

Coolen

Wuchter

et al. 2017

Sci Rep

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“…This archaeon, Methanoperedens nitroreducens , is closely related to S‐AOM performing ANME but uses nitrate as the terminal electron acceptor (Arshad et al, ; Haroon et al, ). M. nitroreducens have so far mostly been detected in freshwater habitats similar to those of M. oxyfera , where they coexist, as nitrite produced by M. nitroreducens can be used by M. oxyfera bacteria (Vaksmaa et al, ; Welte et al, ).…”

Section: Microbial Controls On Methane Transformationsmentioning

confidence: 99%

Methane Feedbacks to the Global Climate System in a Warmer World

Dean

Middelburg

Röckmann

et al. 2018

Reviews of Geophysics

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341

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Methane (CH4) is produced in many natural systems that are vulnerable to change under a warming climate, yet current CH4 budgets, as well as future shifts in CH4 emissions, have high uncertainties. Climate change has the potential to increase CH4 emissions from critical systems such as wetlands, marine and freshwater systems, permafrost, and methane hydrates, through shifts in temperature, hydrology, vegetation, landscape disturbance, and sea level rise. Increased CH4 emissions from these systems would in turn induce further climate change, resulting in a positive climate feedback. Here we synthesize biological, geochemical, and physically focused CH4 climate feedback literature, bringing together the key findings of these disciplines. We discuss environment‐specific feedback processes, including the microbial, physical, and geochemical interlinkages and the timescales on which they operate, and present the current state of knowledge of CH4 climate feedbacks in the immediate and distant future. The important linkages between microbial activity and climate warming are discussed with the aim to better constrain the sensitivity of the CH4 cycle to future climate predictions. We determine that wetlands will form the majority of the CH4 climate feedback up to 2100. Beyond this timescale, CH4 emissions from marine and freshwater systems and permafrost environments could become more important. Significant CH4 emissions to the atmosphere from the dissociation of methane hydrates are not expected in the near future. Our key findings highlight the importance of quantifying whether CH4 consumption can counterbalance CH4 production under future climate scenarios.

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“…Although ANME-2D is generally found in various types of freshwater ecosystems (Welte et al 2016), including lake sediments (L. Cadagno; Schubert et al 2011), no comparable studies concerning its relative abundance in lake sediments exist. The relative abundance of NC 10 bacteria (0.1-0.5% of bacteria) in the study lakes was within the same range (0.1-0.7 %) reported for aquaculture pond sediments, but it was lower than that measured from the sediments of a freshwater reservoir (1.0-1.5%) (Shen et al 2016).…”

Section: Microbial Community Structurementioning

confidence: 99%