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Non‐metric multidimensional scaling (nMDS) of pairwise community dissimilarity (Bray−Curtis) indices of 16S sequencing data of all samples. Shape indicates different sampling type: ▲ biofilm, ♦ washing water and ● sludge. Samples of biotrickling filter 1 are indicated in red and of biotrickling filter 2 in blue. The sample date is present at each data point. OTUs are indicated in grey (+).
