The microbial ecology of permafrost

Journal name:
Nature Reviews Microbiology
Volume:
12,
Pages:
414–425
Year published:
DOI:
doi:10.1038/nrmicro3262
Published online

Abstract

Permafrost constitutes a major portion of the terrestrial cryosphere of the Earth and is a unique ecological niche for cold-adapted microorganisms. There is a relatively high microbial diversity in permafrost, although there is some variation in community composition across different permafrost features and between sites. Some microorganisms are even active at subzero temperatures in permafrost. An emerging concern is the impact of climate change and the possibility of subsequent permafrost thaw promoting microbial activity in permafrost, resulting in increased potential for greenhouse-gas emissions. This Review describes new data on the microbial ecology of permafrost and provides a platform for understanding microbial life strategies in frozen soil as well as the impact of climate change on permafrost microorganisms and their functional roles.

At a glance

Figures

  1. Changes in landscape caused by permafrost thaw and cryoperturbation.
    Figure 1: Changes in landscape caused by permafrost thaw and cryoperturbation.

    a | The terrestrial landscape of the Barrow Environmental Observatory (BEO) at the North Slope of Alaska contains a network of polygonal features owing to ice-wedge formation. b | The image shows different polygon types: high-centred polygons with raised centres to the left, transitioning to low-centred polygons to the right and a polygonal pond at the top. c | The image shows a low-centred polygon with a depressed and wet centre and highly vegetated troughs. d | The image shows a flat-centred polygon in transition between high and low-centred polygons. e | The image shows unvegetated frost boils (approximately 1.5–2 m in diameter) at Disko Island, Greenland. Scale bars in parts ac represent 20 m distances. Images in parts ac taken using a kite with attached camera, courtesy of Baptiste Dafflon (Lawrence Berkeley National Laboratory, University of California, USA). Image in part d courtesy of Berkeley lab — Roy Kaltschmidt, photographer.

  2. Permafrost thaw features at lowland and highland elevations.
    Figure 2: Permafrost thaw features at lowland and highland elevations.

    The permafrost is overlain by a seasonally thawed active layer (brown). The bold dashed line indicates the surface of the permafrost table. The lowland is characterized by polygons that are separated by ice wedges (white) in the permafrost layer (grey). A thermokarst lake is indicated by a deepening of the active layer and pooling of thaw water at the surface. At high elevations, permafrost thaw results in drainage of the soil moisture and subsidence, which leads to the 'drunken tree' phenomenon. In these locations, permafrost thaw can also originate from the heat that is generated by wildfires. The upper panel and lower right-hand panel indicate differences in redox chemistry, soil and moisture with depth. The lower left-hand panels show close-ups of individual soil microaggregates (brown, active layer; grey, permafrost) and microcolonies of bacterial or archaeal cells in the pores containing free water — that is, brine veins. Figure is not drawn to scale.

  3. Microbial composition of permafrost from different geographical locations.
    Figure 3: Microbial composition of permafrost from different geographical locations.

    a | Taxonomic distribution of bacteria in different permafrost environments20, 28, 46, 47, 50, 53, 61, 63 based on their 16S rRNA gene classifications. Pie charts represent relative abundances of different phyla in a sample set. Note that the differences in community composition could be a result of differences in sample origin as well as differences in the techniques that were used. All studies characterized a single (that is, non-replicated) permafrost sample, except Mackelprang et al.47, which analysed two cores, and Taş et al.20 and Mondav et al.53, which analysed three replicate permafrost samples per sampling location. b | Phylogenetic representation of permafrost collected from two samples at Hess Creek, Alaska47, on the basis of the average relative abundances of 18S and 16S rRNA genes in metagenomic sequence-reads at the domain level (that is, the level of the Eukarya, Archaea and Bacteria). c | Phylogenetic representation of permafrost collected from two samples at Hess Creek, Alaska47, on the basis of the average relative abundances of 18S and 16S rRNA genes in metagenomic sequence-reads at the phylum level for Bacteria. Within each bacterial phylum, several dominant genera were observed.

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  1. Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, MS 70A-3317 Berkeley, California 94720, USA.

    • Janet K. Jansson &
    • Neslihan Taş
  2. Joint Genome Institute (JGI), 2800 Mitchell Drive, Walnut Creek, California 94598, USA.

    • Janet K. Jansson
  3. Joint BioEnergy Institute (JBEI), 5885 Hollis Street, Emeryville, California 94608, USA.

    • Janet K. Jansson
  4. Danish Center for Permafrost (CENPERM), University of Copenhagen, Oester Voldgade 10, DK-1350 Copenhagen, Denmark.

    • Janet K. Jansson
  5. Department of Plant and Microbial Biology, University of California, 111 Koshland Hall, Berkeley, California 94720-3102, USA.

    • Janet K. Jansson

Competing interests statement

The authors declare no competing interests.

Corresponding author

Correspondence to:

Author details

  • Janet K. Jansson

    Janet K. Jansson is a senior staff scientist at the Lawrence Berkeley National Laboratory (LBNL), University of California, USA, and is Ecosystems Biology Program Lead for the Earth Sciences Division at LBNL, with Adjunct Professor positions at the University of California, Berkeley, USA, and the University of Copenhagen, Denmark. She is an expert in the application of molecular 'omics' tools for gaining an understanding of microbial communities in complex environments, including soil, sediments and the human gut.

  • Neslihan Taş

    Neslihan Taş is a postdoctoral researcher at the Lawrence Berkeley National Laboratory (LBNL), University of California, USA. Her research involves using next-generation sequencing technologies to understand microbial community functioning and ecology in boreal and temporal soils.

Supplementary information

PDF files

  1. Supplementary information S1 (table) (438 KB)

    Permafrost isolates and characteristics of interest

Additional data