Fig. 3: Comparison of the rpoB-based OTU compositions of the analyzed samples.

a Principal Coordinate Analysis (PCoA) of all samples using the pairwise Bray-Curtis dissimilarity as a distance metric. The distances were calculated using all OTUs in a sample. Circles denote microbial community samples, while triangles refer to the water column samples. Within these, samples for treatments with added DNA are shown using filled symbols, while all remaining samples are shown using open symbols. For the PCoA analyses carried out using 16S rRNA-based OTUs, see Supplementary Fig. S3. b–d PCoA of the samples within each of the three clusters. Same distance measure and same symbol notations as in a. e Taxonomic composition of samples within each of the three clusters. See Supplementary Table S3 for the actual relative abundance values.