Shifts in methanogenic community composition and methane fluxes along the degradation of discontinuous permafrost

Liebner, Susanne; Ganzert, Lars; Kiss, Andrea; Yang, Shuai; Wagner, Dirk; Svenning, Mette M.

doi:10.3389/fmicb.2015.00356

Cited by 61 publications

(66 citation statements)

References 56 publications

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“…At Stordalen, the transition from bog to fen is accompanied by community diversification and proliferation of methanogens and a decrease in the relative ratio of methanotrophs. It appears at Stordalen, as found elsewhere under similar conditions (Liebner et al ., ), that at the point of inundation a regime shift is initiated and that beyond this point, the community does not recover but instead shifts towards a new stable state as found in the fen. The fen assemblage has qualities indicative of greater stability (high redundancy, evenness, richness and diversity) coincident with an altered C‐budget of dramatically higher warming potential.…”

Section: Resultsmentioning

confidence: 99%

Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient

Mondav

McCalley

Hodgkins

et al. 2017

Environmental Microbiology

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Biogenic production and release of methane (CH ) from thawing permafrost has the potential to be a strong source of radiative forcing. We investigated changes in the active layer microbial community of three sites representative of distinct permafrost thaw stages at a palsa mire in northern Sweden. The palsa site (intact permafrost and low radiative forcing signature) had a phylogenetically clustered community dominated by Acidobacteria and Proteobacteria. The bog (thawing permafrost and low radiative forcing signature) had lower alpha diversity and midrange phylogenetic clustering, characteristic of ecosystem disturbance affecting habitat filtering. Hydrogenotrophic methanogens and Acidobacteria dominated the bog shifting from palsa-like to fen-like at the waterline. The fen (no underlying permafrost, high radiative forcing signature) had the highest alpha, beta and phylogenetic diversity, was dominated by Proteobacteria and Euryarchaeota and was significantly enriched in methanogens. The Mire microbial network was modular with module cores consisting of clusters of Acidobacteria, Euryarchaeota or Xanthomonodales. Loss of underlying permafrost with associated hydrological shifts correlated to changes in microbial composition, alpha, beta and phylogenetic diversity associated with a higher radiative forcing signature. These results support the complex role of microbial interactions in mediating carbon budget changes and climate feedback in response to climate forcing.

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Section: Resultsmentioning

confidence: 99%

Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient

Mondav

McCalley

Hodgkins

et al. 2017

Environmental Microbiology

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“…In permafrost soils, H 2 /CO 2 and acetate are the main substrates (Kotsyurbenko et al, 2001;Basiliko et al, 2003;Nozhevnikova et al, 2003;Galand et al, 2005;Kotsyurbenko, 2005;Metje and Frenzel, 2007;McCalley et al, 2014;Yang et al, 2017), but there are contradicting reports on the respective predominant methanogenesis pathway in thawing permafrost. Several studies found an association of acetoclastic methanogenesis with thawing permafrost (Høj et al, 2008;Barbier et al, 2012;McCalley et al, 2014;Mondav et al, 2014;Blake et al, 2015;Coolen and Orsi, 2015;Gill et al, 2017;Voigt et al, 2017), while other data suggests an increase in hydrogenotrophic methanogenesis (Kotsyurbenko, 2005;Wagner et al, 2005;Kotsyurbenko et al, 2007;Blake et al, 2015;Liebner et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Increases in temperature and nutrient availability positively affect methane‐cycling microorganisms in Arctic thermokarst lake sediments

Zandt

Meisel

et al. 2018

Environmental Microbiology

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Arctic permafrost soils store large amounts of organic matter that is sensitive to temperature increases and subsequent microbial degradation to methane (CH ) and carbon dioxide (CO ). Here, we studied methanogenic and methanotrophic activity and community composition in thermokarst lake sediments from Utqiag˙vik (formerly Barrow), Alaska. This experiment was carried out under in situ temperature conditions (4°C) and the IPCC 2013 Arctic climate change scenario (10°C) after addition of methanogenic and methanotrophic substrates for nearly a year. Trimethylamine (TMA) amendment with warming showed highest maximum CH production rates, being 30% higher at 10°C than at 4°C. Maximum methanotrophic rates increased by up to 57% at 10°C compared to 4°C. 16S rRNA gene sequencing indicated high relative abundance of Methanosarcinaceae in TMA amended incubations, and for methanotrophic incubations Methylococcaeae were highly enriched. Anaerobic methanotrophic activity with nitrite or nitrate as electron acceptor was not detected. This study indicates that the methane cycling microbial community can adapt to temperature increases and that their activity is highly dependent on substrate availability.

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“…The methanogenic community structure was found to be associated with environmental pH, temperature, salinity, ground water level and vegetation dynamics at different spatial and temporal scales (Megonigal et al, 2005; Milferstedt et al, 2010; Frank-Fahle et al, 2014; McCalley et al, 2014; Cui et al, 2015; Liebner et al, 2015). For example, acetoclastic methanogenesis is generally hampered by low pH as it reduces the acetate dissociation (Megonigal et al, 2005; Kotsyurbenko et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

Yang

Horn

et al. 2017

Front. Microbiol.

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Methanogenic archaea are important for the global greenhouse gas budget since they produce methane under anoxic conditions in numerous natural environments such as oceans, estuaries, soils, and lakes. Whether and how environmental change will propagate into methanogenic assemblages of natural environments remains largely unknown owing to a poor understanding of global distribution patterns and environmental drivers of this specific group of microorganisms. In this study, we performed a meta-analysis targeting the biogeographic patterns and environmental controls of methanogenic communities using 94 public mcrA gene datasets. We show a global pattern of methanogenic archaea that is more associated with habitat filtering than with geographical dispersal. We identify salinity as the control on methanogenic community composition at global scale whereas pH and temperature are the major controls in non-saline soils and lakes. The importance of salinity for structuring methanogenic community composition is also reflected in the biogeography of methanogenic lineages and the physiological properties of methanogenic isolates. Linking methanogenic alpha-diversity with reported values of methane emission identifies estuaries as the most diverse methanogenic habitats with, however, minor contribution to the global methane budget. With salinity, temperature and pH our study identifies environmental drivers of methanogenic community composition facing drastic changes in many natural environments at the moment. However, consequences of this for the production of methane remain elusive owing to a lack of studies that combine methane production rate with community analysis.

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Shifts in methanogenic community composition and methane fluxes along the degradation of discontinuous permafrost

Cited by 61 publications

References 56 publications

Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient

Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient

Increases in temperature and nutrient availability positively affect methane‐cycling microorganisms in Arctic thermokarst lake sediments

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

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