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Structure and function of the global topsoil microbiome

Item Type:Article
Title:Structure and function of the global topsoil microbiome
Creators Name:Bahram, M. and Hildebrand, F. and Forslund, S.K. and Anderson, J.L. and Soudzilovskaia, N.A. and Bodegom, P.M. and Bengtsson-Palme, J. and Anslan, S. and Coelho, L.P. and Harend, H. and Huerta-Cepas, J. and Medema, M.H. and Maltz, M.R. and Mundra, S. and Olsson, P.A. and Pent, M. and Põlme, S. and Sunagawa, S. and Ryberg, M. and Tedersoo, L. and Bork, P.
Abstract:Soils harbour some of the most diverse microbiomes on Earth and are essential for both nutrient cycling and carbon storage. To understand soil functioning, it is necessary to model the global distribution patterns and functional gene repertoires of soil microorganisms, as well as the biotic and environmental associations between the diversity and structure of both bacterial and fungal soil communities. Here we show, by leveraging metagenomics and metabarcoding of global topsoil samples (189 sites, 7,560 subsamples), that bacterial, but not fungal, genetic diversity is highest in temperate habitats and that microbial gene composition varies more strongly with environmental variables than with geographic distance. We demonstrate that fungi and bacteria show global niche differentiation that is associated with contrasting diversity responses to precipitation and soil pH. Furthermore, we provide evidence for strong bacterial-fungal antagonism, inferred from antibiotic-resistance genes, in topsoil and ocean habitats, indicating the substantial role of biotic interactions in shaping microbial communities. Our results suggest that both competition and environmental filtering affect the abundance, composition and encoded gene functions of bacterial and fungal communities, indicating that the relative contributions of these microorganisms to global nutrient cycling varies spatially.
Publisher:Nature Publishing Group (U.K.)
Page Range:233-237
Date:9 August 2018
Official Publication:https://doi.org/10.1038/s41586-018-0386-6
PubMed:View item in PubMed

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