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Fig. S1. Lake water salinity in relative to bacterial phylotype richness (a) and phylogenetic diversity (b) based on 97% sequence similarity in Tibetan Plateau lake sediments. The communities were randomly sampled at the 4000 sequences level.

Fig. S2. Sediment pH in relative to Archaea phylotype richness based on 97% sequence similarity in Tibetan Plateau lake sediments. The communities were randomly sampled at the 4000 sequences level.

Table S1. Sediment physical and chemical properties and lake water salinity.

Table S2. Pairwise geographic distance (km) matrix.

Table S3. Relative average abundances of phyla across all sediments and sediments 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 S4. Correlations (r) between bacterial phylotype richness and phylogenetic diversity and sediment and site characteristics and lake water salinity. Values in bold indicate significant correlations (P < 0.05).

Table S5 The detected OUTs, percentages of overlap, unique and diversity indices for each sample per 4000 sequences.

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