Table 1.

Average relative abundance and prevalence of phyla and genera

Phylum	Genus	Abundance	SD	Max	Prevalence
Aquificae	Venenivibrio	0.112	0.231	0.968	0.742
Proteobacteria	Acidithiobacillus	0.111	0.242	0.994	0.629
Aquificae	Hydrogenobaculum	0.100	0.235	0.999	0.608
Aquificae	Aquifex	0.086	0.212	0.971	0.497
Deinococcus-Thermus	Thermus	0.025	0.071	0.732	0.552
Proteobacteria	Thiomonas	0.024	0.101	0.941	0.396
Proteobacteria	Desulfurella	0.022	0.067	0.758	0.497
Crenarchaeota	Sulfolobaceae (f)	0.020	0.091	0.951	0.416
Euryarchaeota	Thermoplasmatales (o)	0.019	0.059	0.495	0.539
Proteobacteria	Thiovirga	0.015	0.077	0.816	0.374
Proteobacteria	Hydrogenophilaceae (f)	0.015	0.072	0.704	0.406
Thermodesulfobacteria	Caldimicrobium	0.015	0.052	0.651	0.519
Proteobacteria	Hydrogenophilus	0.013	0.045	0.432	0.484
Thermotogae	Mesoaciditoga	0.011	0.033	0.286	0.410
Parcubacteria	Parcubacteria (p)	0.010	0.024	0.193	0.608

Only taxa above a 1% average compositional threshold are shown. Maximum abundance of each taxon within individual features and standard deviation across all 925 springs. Where taxonomy assignment failed to classify to genus level, the closest assigned taxonomy is shown

SD = standard deviation, f = family, o = order, p = phylum