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Fig. 2 | Microbiome

Fig. 2

From: Towards a balanced view of the bacterial tree of life

Fig. 2

Environmental distribution of the four bacterial phyla with the highest taxonomic richness. For each phylum (left column), the proportion of all 97% OTUs derived from metagenomes exclusively (middle column, black) or observed previously either in the SILVA database or by genome sequencing (middle column, white) is indicated together with their environmental origin (right column). In instances where SSU rRNA gene sequences in 97% OTUs originated from different environmental categories, all categories were considered with a maximum count of one per environment. Connections between columns are only shown if representing more than ten 97% OTUs. Stacked bars illustrate total number of 97% OTUs in the respective habitat and either containing SSU rRNA gene sequences which include SILVA representatives (green), sequences derived from metagenomes exclusively (red), or from reference genomes (turquoise). We excluded the environment type “engineered” from this figure due to the heterogeneous origins of these samples

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