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Journal Article

Permafrost microbial communities and functional genes are structured by latitudinal and soil geochemical gradients

Authors

Waldrop,  Mark P.
External Organizations;

Chabot,  Christopher L.
External Organizations;

/persons/resource/sliebner

Liebner,  Susanne
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/sholm

Holm,  Stine
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Snyder,  Michael W.
External Organizations;

Dillon,  Megan
External Organizations;

Dudgeon,  Steven R.
External Organizations;

Douglas,  Thomas A.
External Organizations;

Leewis,  Mary-Cathrine
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Walter Anthony,  Katey M.
External Organizations;

McFarland,  Jack W.
External Organizations;

Arp,  Christopher D.
External Organizations;

Bondurant,  Allen C.
External Organizations;

Taş,  Neslihan
External Organizations;

Mackelprang,  Rachel
External Organizations;

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Fulltext (public)

5017677.pdf
(Publisher version), 4MB

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Citation

Waldrop, M. P., Chabot, C. L., Liebner, S., Holm, S., Snyder, M. W., Dillon, M., Dudgeon, S. R., Douglas, T. A., Leewis, M.-C., Walter Anthony, K. M., McFarland, J. W., Arp, C. D., Bondurant, A. C., Taş, N., Mackelprang, R. (2023): Permafrost microbial communities and functional genes are structured by latitudinal and soil geochemical gradients. - ISME Journal, 17, 1224-1235.
https://doi.org/10.1038/s41396-023-01429-6


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017677
Abstract
Permafrost underlies approximately one quarter of Northern Hemisphere terrestrial surfaces and contains 25–50% of the global soil carbon (C) pool. Permafrost soils and the C stocks within are vulnerable to ongoing and future projected climate warming. The biogeography of microbial communities inhabiting permafrost has not been examined beyond a small number of sites focused on local-scale variation. Permafrost is different from other soils. Perennially frozen conditions in permafrost dictate that microbial communities do not turn over quickly, thus possibly providing strong linkages to past environments. Thus, the factors structuring the composition and function of microbial communities may differ from patterns observed in other terrestrial environments. Here, we analyzed 133 permafrost metagenomes from North America, Europe, and Asia. Permafrost biodiversity and taxonomic distribution varied in relation to pH, latitude and soil depth. The distribution of genes differed by latitude, soil depth, age, and pH. Genes that were the most highly variable across all sites were associated with energy metabolism and C-assimilation. Specifically, methanogenesis, fermentation, nitrate reduction, and replenishment of citric acid cycle intermediates. This suggests that adaptations to energy acquisition and substrate availability are among some of the strongest selective pressures shaping permafrost microbial communities. The spatial variation in metabolic potential has primed communities for specific biogeochemical processes as soils thaw due to climate change, which could cause regional- to global- scale variation in C and nitrogen processing and greenhouse gas emissions.