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Fig. S1. Bacterial community distances in the pan-arctic soil samples and in soils 0.02–0.1 km apart within selected sites.

Fig. S2. Soil sampling sites across the Arctic. The red line indicates the extent of the arctic region as defined by the Arctic Human Development Report (ACIA, 2005).

Table S1. Relative average abundances of phyla classified with RDPII taxonomy across all soils and soils grouped into various pH categories (values represent % of total non-redundant sequences). Asterisks indicate sequences classified to the domain Bacteria, but not to a specific phylum.

Table S2. Correlations (R2) between bacterial phylotype richness, phylogenetic diversity (PD) and soil and site characteristics. Values in bold indicate significant correlations (P < 0.05). DOC: dissolved organic carbon; DON; dissolved organic nitrogen: Avail. P: available P; MBC: soil microbial biomass C; MBN: soil microbial biomass N; MBP: soil microbial biomass P.

Table S3. Relative average abundances of phyla classified with RDPII taxonomy across all soils and soils grouped into various pH categories (values represent % of total non-redundant sequences). Asterisks indicate sequences within a phylum that were not classified to a specific class.

Table S4. Soil biogeochemical characteristics in the pan-arctic sites.

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