U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Novel Methanogenic Microbe Discovered in Thawing Permafrost
Published: February 14, 2014
Posted: March 27, 2014

Northern high-latitude ecosystems are undergoing rapid changes with rising temperatures catalyzing the transition of many permafrost sites to wetlands. As the organic carbon locked in permafrost thaws, it becomes accessible to decomposition by microbial communities. Understanding of these communities is limited, especially regarding functional processes that impact rates of carbon degradation and the balance of carbon dioxide (CO2) versus methane (CH4) released to the atmosphere. In a new U.S. Department of Energy Genomic Science Program study led by researchers at the University of Arizona, a combination of metagenomics, metaproteomics, and geochemical flux measurements were used to characterize microbial community structure and function at a thawing permafrost site in northern Sweden. A new species of archaea, Candidatus Methanoflorens stordalenmirensis, was found to dominate methanogen populations in the thawing active layer of permafrost. Using deep metagenomic sequencing, the team was able to assemble a nearly complete genome from this organism and identify the metabolic pathway for methanogenesis—consumption of hydrogen and CO2 and production of CH4. Measurements of CH4 flux at the thawing permafrost site and quantitative in situ detection of M. stordalenmirensis methanogensis proteins suggest that this organism may perform the majority of methane production at these sites, especially during thawing. The team also searched published metagenomic libraries collected from permafrost sites across the northern hemisphere and detected closely related methanogens at high numbers in the majority of sites. The dominance of a single organism in methane production is a surprising finding. Given evidence for the global distribution of this type methanogen in thawing permafrost sites, these results may have wide-ranging implications for understanding of climate change impacts.

Reference: Mondav, R., B. J. Woodcroft, E.-H. Kim, C. K. McCalley, S. B. Hodgkins, P. M. Crill, J. Chanton, G. B. Hurst, N. C. VerBerkmoes, S. R. Saleska, P. Hugenholtz, V. I. Rich, and G. W. Tyson. 2014. “Discovery of a Novel Methanogen Prevalent in Thawing Permafrost,” Nature Communications 5, DOI: 10.1038/ncomms4212. (Reference link)

Contact: Joseph Graber, SC-23.2, (301) 903-1239
Topic Areas:

  • Research Area: Subsurface Biogeochemical Research
  • Research Area: Carbon Cycle, Nutrient Cycling
  • Research Area: Genomic Analysis and Systems Biology
  • Research Area: Microbes and Communities

Division: SC-23.2 Biological Systems Science Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)