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Non‐metric multidimensional scaling (nMDS) of pairwise community dissimilarity (Bray−Curtis) indices of 16S sequencing data of the samples of the last sampling period (cluster 3). Shape indicates different sampling type: ▲ biofilm and ♦ washing water. Samples of biotrickling filter 1 are indicated in red and of biotrickling filter 2 in blue. The sample date is indicated at each data point. OTUs are indicated in grey (+).
