2013
DOI: 10.1038/ismej.2013.219
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Distinct microbial communities associated with buried soils in the Siberian tundra

Abstract: Cryoturbation, the burial of topsoil material into deeper soil horizons by repeated freeze-thaw events, is an important storage mechanism for soil organic matter (SOM) in permafrost-affected soils. Besides abiotic conditions, microbial community structure and the accessibility of SOM to the decomposer community are hypothesized to control SOM decomposition and thus have a crucial role in SOM accumulation in buried soils. We surveyed the microbial community structure in cryoturbated soils from nine soil profile… Show more

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Cited by 140 publications
(128 citation statements)
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“…Other studies have described similar communities in analogous environments, i.e. the Arctic permafrost5354 and a methane-emitting wetland on Spruce Mountains55, which poses these bacterial OTUs as keystones within the carbon cycle network. Members of the family Syntrophaceae ( Synthrophus and Smithella ) have been additionally identified in hydrocarbon-impacted environments, implying that they may be players also in syntrophic hydrocarbon metabolism56.…”
Section: Discussionmentioning
confidence: 83%
“…Other studies have described similar communities in analogous environments, i.e. the Arctic permafrost5354 and a methane-emitting wetland on Spruce Mountains55, which poses these bacterial OTUs as keystones within the carbon cycle network. Members of the family Syntrophaceae ( Synthrophus and Smithella ) have been additionally identified in hydrocarbon-impacted environments, implying that they may be players also in syntrophic hydrocarbon metabolism56.…”
Section: Discussionmentioning
confidence: 83%
“…3), which may occur through direct initial HS degradation reactions using extracellular enzymes and/or further metabolism of the HS degradative intermediates from fungi or other soil bacteria. This hypothesis is partially based on many ecological data that fungi, in particular saprotrophic basidiomycetes, produce various extracellular enzymes, such as laccase and peroxidases, which catalyze the breakdown of biopolymers to lowmolecular weight organic matter that can then be utilized by other soil microorganisms [2]. Indeed, the abundance of Proteobacteria, specifically class Betaproteobacteria, was positively affected during HA-degrading enrichment culturing at 5°C (Fig.…”
Section: Discussionmentioning
confidence: 99%
“…Obligate methylamine-utilizers Methylotenera were first detected after 66 days of incubation. In contrast, other main phyla (oligotrophic Acidobacteria, metabolically versatile Actinobacteria, and widely distributed Bacteroidetes), whose dominant presence and ecological functions in tundra soils have been described [1,2], responded negatively to an increase in incubation time. Because oligotrophic microorganisms normally thrive in low-nutrient environments, the decreased proportions of Acidobacteria in this microbial community might be explained by the consistent increase of low-molecular weight compounds, which act as available substrates for surrounding bacteria.…”
Section: Phylogenetic Analysis Of Microbial Communities At Low Tempermentioning
confidence: 95%
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“…However, reports describing successful strategies for aDNA extraction and rDNA amplification have mainly concerned frosted soils where low temperatures preserve biomaterial (Xu et al, 2011;Gittel et al, 2014). Several attempts by us to obtain aDNA from the soil samples using commercial kits such as NucleoSpin Soil™ were unsuccessful, probably because of the effect of high temperature and salinity on sample integrity.…”
Section: Identification Of Microbes and Deterioration Of Oat Branmentioning
confidence: 99%