Table 1.

Abundance estimates (%) of major population types^a obtained from Octopus and Bechler springs based on analysis of metagenome sequence reads against reference de novo assemblies (at 90% nucleotide identity).

Phylotype	G+C (%)	Spring
		Octopus	Bechler
Aquificales, Thermocrinis spp.	45	18	62
Novel firmicutes	53	13	<1
“Pyropristinus” Type 1	44	8	12
“Pyropristinus” Type 2	29	8	<1
Aigarchaeota, Ca. Calditenuis aerorheumensisb	60	8	<1
Pyrobaculum spp.	57	7	7
Calescamantes-OSc	35	7	<1
Unknown bacteria		3	<1
Desulfurococcales	58	<1	<1
Orphans (Unassigned)		25	13

^aPopulations shaded in gray are the focus of the current study.

^bBeam et al., 2016.

^cHedlund et al., 2014.