Fig. 3

a. NMDS ordination plot, based on Bray-Curtis distance matrixes of log (X + 1)-transformed bacterial sequencing data (community at family level ≥ 1% in at least one sample). The stress value (i.e., < 0.2) suggests for an accurate representation of the dissimilarity among samples. b. Correspondence analysis plot based on groundwaters bacterial 16 S rRNA sequencing data. c. Correspondence analysis plot based on thermal waters bacterial 16 S rRNA sequencing data. 1, Blastocatellaceae; 2, Holophagaceae; 3, Corynebacteriaceae; 4, Nocardiaceae; 5, Sporichthyaceae; 6, Intrasporangiaceae; 7, Microbacteriaceae; 8, Nocardioidaceae; 9, Propionibacteriaceae; 10, Streptomycetaceae; 11, Cyclobacteriaceae; 12, Crocinitomicaceae; 13, Flavobacteriaceae; 14, Anaerolineaceae; 15, Ardenticatenales un.; 16, Chloroflexaceae; 17, Chloroplast un.; 18, Phormidiaceae; 19, Pseudanabaenaceae; 20, Thermaceae; 21, Sulfurovaceae; 22, Campylobacterales un.; 23, Clostridiaceae 1; 24, Clostridiales Incertae Sedis; 25, Heliobacteriaceae; 26, Lachnospiraceae; 27, Peptostreptococcaceae; 28, Nitrospiraceae; 29, Thermodesulfovibrionia un.; 30, Omnitrophicaeota un.; 31, Candidatus Peribacteria; 32, Parcubacteria un.; 33, Saccharimonadales un.; 34, Caulobacteraceae; 35, Paracaedibacteraceae; 36, Reyranellaceae; 37, A0839; 38, Beijerinckiaceae; 39, Rhizobiaceae; 40, Xanthobacteraceae; 41, Rhizobiales un.; 42, Rhodobacteraceae; 43, Rhodospirillales un.; 44, Sphingomonadaceae; 45, Acidiferrobacteraceae; 46, Acidithiobacillaceae; 47, Burkholderiaceae; 48, Chromobacteriaceae; 49, Gallionellaceae; 50, Hydrogenophilaceae; 51, Rhodocyclaceae; 52, Halothiobacillaceae; 53, Pseudomonadaceae; 54, Xanthomonadaceae; 55, Spirochaetaceae.