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FIG. S1. Phylogenetic tree for the 45 16S rDNA sequences obtained from bacteria isolated from PRB originating from sites U1 and S and grown on natural supports. Bootstrap values are based on 1000 runs and are shown where > 50 %. The tree was obtained using neighbor-joining with Aquifex pyrophilus as the outgroup. Aeromonas sobria 100 68 Site S; GQ398362 Aeromonas hydrophila 89 54 Site U1; GQ398335 82 94 Aeromonas sharmana 99 Site U1; GQ398333 85 Raoultella terrigena 79 Site U1; GQ398332 88 Citrobacter freundii 49 Site U1; GQ398331 Citrobacter gillenii 67 99 85 Site S; GQ398363 63 Site S; GQ398365 62 Klebsiella oxytoca 68 Site U1; GQ398334 100 Morganella morganii 58 100 Site S; GQ398364 75 Site U1; GQ398343 91 86 99 69 Pseudomonas fluorescens 95 100 Pseudomonas putida 73 Site S; GQ398373 83 62 Microbacterium oxydans 100 100 Site S; GQ398361 63 76 63 Site U1; GQ398340 51 98 Arthrobacter aurescens 99 95 Arthrobacter oryzae 86 97 84 Microbacterium oxydans 60 65 100 Site S; GQ398372 100 Site U1; GQ398337 100 99 Site U1; GQ39837345 100 97 100 Site S; GQ39837358 95 Rhodococcus tukisamuensis Rhodococcus equi Bacillus flexus Site S; GQ39837360 Site S; GQ39837359 Bacillus cereus Exiguobacterium sibiricum Exiguobacterium undae Site S; GQ398356 Site S; GQ398355 Site S; GQ398352 Site U1; GQ398341 Exiguobacterium acetylicum Site S; GQ398370 Leucobacter luti Site S; GQ398367 Site S; GQ398366 Curtobacterium flaccumfaciens Site S; GQ398368 Labedella kawkjii Site S; GQ398369 Frigoribacterium faeni Site U1; GQ398339 Moraxella osloensis Site U1; GQ398336 Site S; GQ398371 Acinetobacter johnsonii Site S; GQ398350 Variovorax paradoxus Site U1; GQ398344 Massilia timonae Janthinobacterium lividum Site S; GQ398374 Site S; GQ398375 Zoogloea ramigera Site S; GQ398347 Rhizobium radiobacter Site S; GQ398348 Site U1; GQ398338 Site S; GQ398349 Site S; GQ398346 Sphingomonas molluscorum Site S; GQ398357 Novosphingobium aromaticivorans Site S; GQ398351 Chryseobacterium ureilyticum Site U1; GQ398342 Myroides odoratus Site S; GQ398354 Site S; GQ398353 Flavobacterium johnsoniae Flavobacterium columnare Aquifex pyrophilus Scale: 0.1