Effects of a long‐term anoxic warming scenario on microbial community structure and functional potential of permafrost‐affected soil

Liebner, Susanne; Walz, Josefine; Knoblauch, Christian; Bornemann, Till L. V.; Probst, Alexander J.; Wagner, Dirk; Jetten, Mike S. M.; Zandt, Michiel H. in ’t

doi:10.1002/ppp.2131

Cited by 11 publications

(14 citation statements)

References 104 publications

(151 reference statements)

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“…When frozen, many of the resident microorganisms in permafrost, unlike macroorganisms -'think wooly mammoths' -were able to adapt and survive in subzero temperatures 7,14 . These psychrotolerant microorganisms 15 also have to endure other stressful conditions, including high salinity, and low water and nutrient availability [16][17][18] ; as well as anoxia and low pH in frozen bogs and fens 19,20 . Permafrost "microbes" include bacteria, archaea, fungi, algae, protists and viruses.…”

Section: Microbes In Permafrostmentioning

confidence: 99%

Permafrost as a potential pathogen reservoir

Wu¹,

Trubl²,

Taş³

et al. 2022

One Earth

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Section: Microbes In Permafrostmentioning

confidence: 99%

Permafrost as a potential pathogen reservoir

Wu¹,

Trubl²,

Taş³

et al. 2022

One Earth

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“…Microbial metabolic activity increases rapidly with higher temperatures during thaw [8]. Bacterial and fungal communities also show shifts in both composition and function [8][9][10][11][12][13][14][15]. Changes to longterm soil temperature averages, particularly at the 'transition zone' (where the seasonally-thawed active layer meets permafrost) can therefore be expected to impact microbial activity in permafrost regions [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Changes to longterm soil temperature averages, particularly at the 'transition zone' (where the seasonally-thawed active layer meets permafrost) can therefore be expected to impact microbial activity in permafrost regions [16,17]. Some changes are consistently observed, such as increases in soil respiration, and in genes for organic C degradation [9,14,15]. But outcomes such as changes to nitrogen (N) cycling and production of greenhouse gases like methane and nitrous oxide are likely to depend on changes to microbial community composition following thaw [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in near-surface seasonally thawed active layer and permafrost soil microbial communities

Baker

Barker

Douglas

et al. 2023

Environ. Res. Lett.

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Understanding how soil microbes respond to permafrost thaw is critical to predicting the implications of climate change for soil processes. However, our knowledge of microbial responses to warming is mainly based on laboratory thaw experiments, and field sampling in warmer months when sites are more accessible. In this study, we sample a depth profile through seasonally thawed active layer and permafrost in the Imnavait Creek Watershed, Alaska, USA over the growing season from summer to late fall. Amplicon sequencing showed that bacterial and fungal communities differed in composition across both sampling depths and sampling months. Surface communities were most variable, while those from the deepest samples, which remained frozen throughout our sampling period, showed little to no variation over time. However, community variation was not explained by trace metal concentrations, soil nutrient content, pH, or soil condition (frozen/thawed), except insofar as those measurements were correlated with depth. Our results highlight the importance of collecting samples at multiple times throughout the year to capture temporal variation, and suggest that data from across the annual freeze-thaw cycle might help predict microbial responses to permafrost thaw.

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“…Metagenomic data for PFL were processed with steps of quality control, assembly, genomic binning, and functional annotation according to the flow described by Yang et al (2021b). The abundance of key functional genes (in Transcripts Per Kilobase Million, TPM) involved in methanogenesis, aerobic methane oxidation (MOB), dissimilatory nitrate reduction (DNR) and sulfate reduction (DSR) was compared to provide additional insight to the amplicon-derived data for PFL.…”

Section: Data Processingmentioning

confidence: 99%

Anaerobic methane oxidizing archaea offset sediment methane concentrations in Arctic thermokarst lagoons

Anthony

Jenrich

Zandt

et al. 2022

Preprint

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Thermokarst lagoons represent the transition state from a freshwater lacustrine to a marine environment, and receive little attention regarding their role for greenhouse gas production and release in Arctic permafrost landscapes. We studied the fate of methane (CH4) in sediments of a thermokarst lagoon in comparison to two thermokarst lakes on the Bykovsky Peninsula in northeastern Siberia through the analysis of sediment CH4 concentrations and isotopic signature, methane-cycling microbial taxa, sediment geochemistry, and lipid biomarkers. We specifically assessed whether sulfate-driven anaerobic methane oxidation (S-AOM) through anaerobic methanotrophic archaea (ANMEs), common in marine sediments with constant supply of sulfate and methane, establish after thermokarst lagoon development and whether sulfate-driven ANMEs consequently oxidize CH4 that would be emitted to the water column under thermokarst lake conditions. The marine-influenced lagoon environment had fundamentally different methane-cycling microbial communities and metabolic pathways compared to the freshwater lakes, suggesting a substantial reshaping of microbial and carbon dynamics during lagoon formation. Anaerobic sulfate-reducing ANME-2a/2b methanotrophs dominated the sulfate-rich sediments of the lagoon despite its known seasonal alternation between brackish and freshwater inflow. CH4 concentrations in the freshwater-influenced sediments averaged 1.34±0.98 μmol g-1, with highly depleted δ13C-CH4 values ranging from -89‰ to -70‰. In contrast, the sulfate-affected upper 300 cm of the lagoon exhibited low average CH4 concentrations of 0.011±0.005 μmol g-1 with comparatively enriched δ13C-CH4 values of -54‰ to -37‰ pointing to substantial methane oxidation. Non-competitive methylotrophic methanogens dominated the methanogenic community of the lakes and the lagoon, independent of porewater chemistry and depth. This potentially contributed to the high CH4 concentrations observed in all sulfate-poor sediments. Our study shows that S-AOM in lagoon sediments can effectively reduce sediment CH4 concentrations and we conclude that thermokarst lake to lagoon transitions have the potential to mitigate terrestrial methane fluxes before thermokarst lakes fully transition to a marine environment.

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Effects of a long‐term anoxic warming scenario on microbial community structure and functional potential of permafrost‐affected soil

Cited by 11 publications

References 104 publications

Permafrost as a potential pathogen reservoir

Permafrost as a potential pathogen reservoir

Seasonal variation in near-surface seasonally thawed active layer and permafrost soil microbial communities

Anaerobic methane oxidizing archaea offset sediment methane concentrations in Arctic thermokarst lagoons

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