Permafrost carbon emissions in a changing Arctic

Nature Reviews Earth & Environment, Journal Year: 2022, Volume and Issue: 3(1), P. 55 - 67

Published: Jan. 11, 2022

Language: Английский

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Emergent biogeochemical risks from Arctic permafrost degradation

Nature Climate Change, Journal Year: 2021, Volume and Issue: 11(10), P. 809 - 819

Published: Sept. 30, 2021

Language: Английский

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Multiple energy sources and metabolic strategies sustain microbial diversity in Antarctic desert soils

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(45)

Published: Nov. 3, 2021

Significance Diverse microbial life has been detected in the cold desert soils of Antarctica once thought to be barren. Here, we provide metagenomic, biogeochemical, and culture-based evidence that Antarctic soil microorganisms are phylogenetically functionally distinct from those other adopt various metabolic ecological strategies. The most abundant community members metabolically versatile aerobes use ubiquitous atmospheric trace gases potentially meet energy, carbon, and, through water production, hydration needs. Lineages capable harvesting solar oxidizing edaphic inorganic substrates, or adopting symbiotic lifestyles were also identified. Altogether, these findings insights into adaptation extreme energy limitation will inform ongoing efforts conserve unique biodiversity on this continent.

Language: Английский

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Microbial oxidation of atmospheric trace gases

Nature Reviews Microbiology, Journal Year: 2022, Volume and Issue: 20(9), P. 513 - 528

Published: April 12, 2022

Language: Английский

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Contribution of soil algae to the global carbon cycle

New Phytologist, Journal Year: 2022, Volume and Issue: 234(1), P. 64 - 76

Published: Feb. 1, 2022

Summary Soil photoautotrophic prokaryotes and micro‐eukaryotes – known as soil algae are, together with heterotrophic microorganisms, a constitutive part of the microbiome in surface soils. Similar to plants, they fix atmospheric carbon (C) through photosynthesis for their own growth, yet contribution global regional biogeochemical C cycling still remains quantitatively elusive. Here, we compiled an extensive dataset on generate better understanding distribution across biomes predict productivity at scale by means machine learning modelling. We found that, average, (5.5 ± 3.4) × 10 6 inhabit each gram soil. algal abundance especially peaked acidic, moist vegetated estimate globally, take up around 3.6 Pg per year, which corresponds c . 6% net primary production terrestrial vegetation. demonstrate that fixed is crucial cycle should be integrated into land‐based efforts mitigate emissions.

Language: Английский

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A genomic catalogue of soil microbiomes boosts mining of biodiversity and genetic resources

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

Published: Nov. 11, 2023

Abstract Soil harbors a vast expanse of unidentified microbes, termed as microbial dark matter, presenting an untapped reservoir biodiversity and genetic resources, but has yet to be fully explored. In this study, we conduct large-scale excavation soil matter by reconstructing 40,039 metagenome-assembled genome bins (the SMAG catalogue) from 3304 metagenomes. We identify 16,530 21,077 species-level (SGBs) unknown SGBs (uSGBs), which expand archaeal bacterial diversity across the tree life. also illustrate pivotal role uSGBs in augmenting microbiome’s functional landscape intra-species diversity, providing large proportions 43,169 biosynthetic gene clusters 8545 CRISPR-Cas genes. Additionally, determine that contributed 84.6% previously unexplored viral-host associations catalogue. The catalogue provides useful genomic resource for further studies investigating resources.

Language: Английский

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Structural basis for bacterial energy extraction from atmospheric hydrogen

Nature, Journal Year: 2023, Volume and Issue: 615(7952), P. 541 - 547

Published: March 8, 2023

Abstract Diverse aerobic bacteria use atmospheric H 2 as an energy source for growth and survival 1 . This globally significant process regulates the composition of atmosphere, enhances soil biodiversity drives primary production in extreme environments 2,3 Atmospheric oxidation is attributed to uncharacterized members [NiFe] hydrogenase superfamily 4,5 However, it remains unresolved how these enzymes overcome extraordinary catalytic challenge oxidizing picomolar levels amid ambient poison O derived electrons are transferred respiratory chain Here we determined cryo-electron microscopy structure Mycobacterium smegmatis Huc investigated its mechanism. a highly efficient oxygen-insensitive enzyme that couples hydrogenation electron carrier menaquinone. uses narrow hydrophobic gas channels selectively bind at expense , 3 [3Fe–4S] clusters modulate properties so energetically feasible. The subunits form octameric 833 kDa complex around membrane-associated stalk, which transports reduces menaquinone 94 Å from membrane. These findings provide mechanistic basis biogeochemically ecologically important oxidation, uncover mode coupling dependent on long-range quinone transport, pave way development catalysts oxidize air.

Language: Английский

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Chemosynthetic and photosynthetic bacteria contribute differentially to primary production across a steep desert aridity gradient

The ISME Journal, Journal Year: 2021, Volume and Issue: 15(11), P. 3339 - 3356

Published: May 25, 2021

Abstract Desert soils harbour diverse communities of aerobic bacteria despite lacking substantial organic carbon inputs from vegetation. A major question is therefore how these maintain their biodiversity and biomass in resource-limiting ecosystems. Here, we investigated desert topsoils biological soil crusts collected along an aridity gradient traversing four climatic regions (sub-humid, semi-arid, arid, hyper-arid). Metagenomic analysis indicated vary capacity to use sunlight, compounds, inorganic compounds as energy sources. Thermoleophilia, Actinobacteria, Acidimicrobiia were the most abundant prevalent bacterial classes across both biocrusts. Contrary classical view that taxa are obligate organoheterotrophs, genome-resolved suggested they metabolically flexible, with also atmospheric H2 support respiration often fixation. In contrast, Cyanobacteria patchily distributed only certain Activity measurements profiled oxidation, chemosynthetic CO2 fixation, photosynthesis varied aridity. Cell-specific rates consumption increased 143-fold gradient, correlating abundance high-affinity hydrogenases. Photosynthetic primary production co-occurred throughout dominant biocrusts chemosynthesis arid hyper-arid soils. Altogether, findings suggest lineages inhabiting hot deserts different strategies for acquisition depending on resource availability. Moreover, highlight previously overlooked roles Actinobacteriota producers trace gases critical sources supporting productivity resilience

Language: Английский

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Hydrodynamic disturbance controls microbial community assembly and biogeochemical processes in coastal sediments

The ISME Journal, Journal Year: 2021, Volume and Issue: 16(3), P. 750 - 763

Published: Sept. 28, 2021

Abstract The microbial community composition and biogeochemical dynamics of coastal permeable (sand) sediments differs from cohesive (mud) sediments. Tide- wave-driven hydrodynamic disturbance causes spatiotemporal variations in oxygen levels, which select for generalists disrupt redox cascades. In this work, we profiled communities sediment profiles three sites varying their exposure to disturbance. Strong geochemistry, activities, abundance, composition, capabilities were observed between the sites. Most these variations, except abundance diversity, significantly correlated with relative level each sample. line previous findings, metabolically flexible habitat (e.g., Flavobacteriaceae, Woeseaiceae, Rhodobacteraceae) dominated all samples. However, present evidence that aerobic specialists such as ammonia-oxidizing archaea (Nitrosopumilaceae) more abundant active disturbed samples, whereas bacteria capable sulfate reduction uncultured Desulfobacterales), dissimilatory nitrate ammonium (DNRA; e.g., Ignavibacteriaceae), sulfide-dependent chemolithoautotrophy Sulfurovaceae) enriched less These findings are supported by insights nine deeply sequenced metagenomes 169 derived metagenome-assembled genomes. Altogether, suggest is a critical factor controlling assembly processes Moreover, they strengthen our understanding relationships unique environments.

Language: Английский

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Risk of the hydrogen economy for atmospheric methane

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Dec. 13, 2022

Abstract Hydrogen (H 2 ) is expected to play a crucial role in reducing greenhouse gas emissions. However, hydrogen losses the atmosphere impact atmospheric chemistry, including positive feedback on methane (CH 4 ), second most important gas. Here we investigate through minimalist model response of fossil fuel displacement by hydrogen. We find that CH concentration may increase or decrease depending amount lost and emissions associated with production. Green H can mitigate if throughout value chain are below 9 ± 3%. Blue reduce only 1%. address discuss main uncertainties our results implications for decarbonization energy sector.

Language: Английский

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