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Table S2. Core microbiota: OTUs present in all drainage samples, and their taxonomic classification in the RDP database. The minimum cuttof

value is 80%.

RDP classifier [bootstrap]

OTU Class Order Family Genus

Bacteria Rhodospirillales Rhodospirillaceae __

[100%] [100%] [100%] [97%] [92%] 58 Proteobacteria Alphaproteobacteria ______

[100%] [100%] [96%] 76 Bacteria Proteobacteria Alphaproteobacteria Rhizobiales [100%] __ __

[100%] [100%] [100%] 104 Bacteria Gemmatimonadetes Gemmatimonadales Gemmatimonadaceae Gemmatimonas

[100%] [100%] [100%] [100%] [100%] [100%] 205 Bacteria Proteobacteria ______

[100%] [100%] [97%] 310 Bacteria Proteobacteria Alphaproteobacteria Sphingomonadales Erythrobacteraceae Porphyrobacter

[100%] [100%] [100%] [100%] [99%] [99%]

410 Bacteria ______

[100%] 442 Bacteria Actinobacteria __ __

[100%] [96%] [96%] [87%] 631 Bacteria - Deinococci [100%] [98%] Thermaceae [98%]

[100%] [100%] [98%] 824 Bacteria Bacteroidetes Bacteroidetes Bacteroidetes incertae Ohtaekwangia

[100%] [100%] [95%] incertae sedis [95%] sedis [95%] [95%] 840 Bacteria Acidobacteria Gp4 ______

[100%] [100%] [100%] 1007 Bacteria Deinococcus- Deinococci [100%] Thermales [97%] Thermaceae [97%] Meiothermus

[100%] Thermu [100%] [96%] 1306 Bacteria Acidobacteria Acidobacteria Gp16 ______

[100%] [100%] [100%] 1366 Bacteria Proteobacteria Alphaproteobacteria ______

[100%] [100%] [98%]

1464 Bacteria ______

[97%] 1716 Bacteria ______

[100%] 1900 Bacteria Actinobacteria Actinobacteria Actinomycetales Geodermatophilus

[100%] [100%] [100%] [100%] [94%] [90%] 1950 Bacteria Proteobacteria Myxococcales Nannocystineae __

[100%] [100%] [100%] [100%] [100%] 2035 Bacteria Proteobacteria Alphaproteobacteria Sphingomonadales Sphingomonadaceae __

[100%] [100%] [100%] [100%] [87%] 2109 Bacteria Proteobacteria Betaproteobacteria ______

[100%] [100%] [100%] 2143 Bacteria Acidobacteria Acidobacteria Gp13 ______

[100%] [100%] [100%] 2203 Bacteria ______

[100%] [100%]

2237 Bacteria Proteobacteria Alphaproteobacteria Rhodobacterales Rhodobacteraceae __

[100%] [100%] [100%] [100%] [100%] 2253 Bacteria Proteobacteria Betaproteobacteria ______

[100%] [100%] [97%] 2257 Bacteria Deinococcus- Deinococci [100%] Thermales [100%] Thermaceae [100%] __

[100%] Thermus [100%] 2446 Bacteria Proteobacteria Alphaproteobacteria Rhizobiales [99%] __ __

[100%] [100%] [100%] 2582 Bacteria Proteobacteria Betaproteobacteria Rhodocyclales Rhodocyclaceae __

[100%] [100%] [100%] [95%] [95%] 2774 Bacteria Actinobacteria Actinobacteria ______

[100%] [97%] [97%] 3004 Bacteria ______

[100%] 3047 Bacteria Proteobacteria Alphaproteobacteria Rhizobiales Bradyrhizobiaceae Bradyrhizobium

[100%] [100%] [100%] [100%] [100%] [100%]

3072 Bacteria ______

[100%] [95%] 3089 Bacteria Acidobacteria Acidobacteria Gp4 ______

[100%] [100%] [100%] 3100 Bacteria Proteobacteria Alphaproteobacteria Caulobacteraceae Caulobacterales Phenylobacterium

[100%] [100%] [100%] [100%] [100%] [100%] 3113 Bacteria Proteobacteria Alphaproteobacteria Sphingomonadales Sphingomonadaceae Sphingomonas

[100%] [100%] [100%] [100%] [100%] [89%] 3357 Bacteria Gemmatimonadetes Gemmatimonadetes Gemmatimonadales Gemmatimonadaceae Gemmatimonas

[100%] [95%] [95%] [95%] [95%] [95%] 3607 Bacteria Acidobacteria Acidobacteria Gp16 ______

[100%] [100%] [100%] 3730 Bacteria Proteobacteria Alphaproteobacteria Rhizobiales [100%] __ __

[100%] [100%] [100%] 3824 Bacteria Acidobacteria Acidobacteria Gp16 ______

[100%] [100%] [100%]

3837 Bacteria Actinobacteria Actinobacteria Acidimicrobiales Acidimicrobineae __

[100%] [100%] [100%] [93%] [93%] 3843 Bacteria Proteobacteria Alphaproteobacteria Rhodobacterales Rhodobacteraceae __

[100%] [100%] [100%] [100%] [100%] 3988 Bacteria Proteobacteria Alphaproteobacteria Sphingomonadales Sphingomonadaceae Novosphingobium

[100%] [100%] [100%] [100%] [100%] [100%] 4079 Bacteria Acidobacteria Acidobacteria Gp16 ______

[100%] [100%] [100%] 4096 Bacteria Bacteroidetes "Bacteroidetes" "Bacteroidetes" "Bacteroidetes" Ohtaekwangia

[100%] [100%] incertae sedis [88%] incertae sedis [88%] incertae sedis [88%] [88%] 4351 Bacteria Actinobacteria Actinobacteria Actinomycetales

[100%] [100%] [100%] [100%] [100%] [100%] 4388 Bacteria Deinococcus- Deinococci [100%] Thermales [99%] Thermaceae [99%] Meiothermus

[100%] Thermus [100%] [99%] 4461 Bacteria Bacteroidetes Sphingobacteriales Chitinophagaceae Flavisolibacter

[100%] [100%] [100%] [100%] [100%] [97%]

4798 Bacteria Deinococcus- Deinococci [100%] Thermales [100%] Thermaceae [100%] Meiothermus

[100%] Thermus [100%] [100%] 4863 Bacteria Deinococcus- Deinococci [100%] Thermales [100%] Thermaceae [100%] Meiothermus

[100%] Thermus [100%] [100%] 4873 Bacteria Bacteroidetes Sphingobacteria Sphingobacteriales Chitinophagaceae Flavisolibacter

[100%] [100%] [100%] [100%] [100%] [100%] 4923 Bacteria ______

[100%] 5002 Bacteria Proteobacteria Betaproteobacteria ______

[100%] [100%] [99%] 5088 Bacteria Proteobacteria Alphaproteobacteria Rhodobacterales Rhodobacteraceae __

[100%] [100%] [100%] [100%] [100%] 5118 Bacteria Actinobacteria Actinomycetales Micrococcineae __

[100%] [100%] [100%] [100%] [100%] 5295 Bacteria Proteobacteria Betaproteobacteria ______

[100%] [100%] [100%]

5400 Bacteria Proteobacteria Alphaproteobacteria Rhodobacterales Rhodobacteraceae __

[100%] [100%] [100%] [99%] [99%] 5415 Bacteria Actinobacteria Actinobacteria Actinomycetales Microbacteriaceae __

[100%] [100%] [100%] [100%] [100%] 5436 Bacteria Proteobacteria Betaproteobacteria Rhodocyclales Rhodocyclaceae __

[100%] [100%] [100%] [90%] [90%] 5577 Bacteria Proteobacteria Alphaproteobacteria Rhodospirillales Acetobacteraceae __

[100%] [100%] [100%] [99%] [96%] 5699 Bacteria Proteobacteria Alphaproteobacteria Rhodospirillales Acetobacteraceae __

[100%] [100%] [100%] [100%] [100%] 5742 Bacteria Proteobacteria Alphaproteobacteria Rhizobiales [100%] __ __

[100%] [100%] [100%] 5874