Fig. S1. Number of chitinase reads that are necessary to keep the deviation of the Bray-Curtis distance below 0.05 if compared with the Bray-Curtis distance calculated from all available reads (‘true Bray-Curtis-distance’). 07-04-08H: high-diversity sample (chao1: 155); ss07-14-08H: high diversity sample (chao1: 180); 08-28-08: medium-diversity sample (chao1: 74).

Fig. S2. RAxML tree of chitinase genes (GH18) based on 100 bootstraps. Group A, B and C chitinase genes are indicated. Each OTU is represented by its longest sequence (OTU_0–OTU_399). Sequences representing the 15 most abundant OTUs are highlighted in colour. For non-bacterial reference sequences the domain is indicated.

Table S1. Used pyrosequencing barcodes and pyrosequencing output data (OTU: operational taxonomic unit).

Table S2. Arrangement of chitinase gene (GH18) reads into OTUs using CD-Hit program (75% cut-off level). An asterisk indicates the longest sequence of each OTU, which was used as reference sequence. For all other reads within an OTU similarities to this reference read are given.

Table S3. Species data. Relative frequency of the OTUs derived from pyrosequencing of chitinase genes (CD-Hit program, 75% cut-off level).

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