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

Autor: Waldrop MP; Geology, Minerals, Energy, and Geophysics Science Center, United States Geological Survey, Menlo Park, CA, 94025, USA. mwaldrop@usgs.gov., Chabot CL; California State University Northridge, 18111 Nordhoff St., Northridge, CA, 91330, USA., Liebner S; GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473, Potsdam, Germany.; University of Potsdam, Institute of Biochemistry and Biology, 14476, Potsdam, Germany., Holm S; GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473, Potsdam, Germany., Snyder MW; California State University Northridge, 18111 Nordhoff St., Northridge, CA, 91330, USA., Dillon M; Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA., Dudgeon SR; California State University Northridge, 18111 Nordhoff St., Northridge, CA, 91330, USA., Douglas TA; U.S. Army Cold Regions Research and Engineering Laboratory 9th Avenue, Building 4070 Fort, Wainwright, AK, 99703, USA., Leewis MC; Agriculture and Agri-Food Canada, 2560 Boulevard Hochelaga, Québec, QC, G1V 2J3, Canada., Walter Anthony KM; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, 99775, USA., McFarland JW; Geology, Minerals, Energy, and Geophysics Science Center, United States Geological Survey, Menlo Park, CA, 94025, USA., Arp CD; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, 99775, USA., Bondurant AC; Water and Environmental Research Center, University Alaska Fairbanks, Fairbanks, AK, 99775, USA., Taş N; Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA., Mackelprang R; California State University Northridge, 18111 Nordhoff St., Northridge, CA, 91330, USA. rachel.mackelprang@gmail.com.
Jazyk: angličtina
Zdroj: The ISME journal [ISME J] 2023 Aug; Vol. 17 (8), pp. 1224-1235. Date of Electronic Publication: 2023 May 22.
DOI: 10.1038/s41396-023-01429-6
Abstrakt: 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.
(© 2023. The Author(s).)
Databáze: MEDLINE
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