Fig. 3: Relative abundances of microbial populations present in Conch and Octopus Springs sampled in 2011 and 2012.

Organisms common to both sites include Thermocrinis, Pyrobaculum, and Caldipriscus (Pyropristinus) (hatched). Other populations (clockwise, in order of abundance) include Thermodesulfobacteria and 2 members of the Desulfurococcales at Conch Spring (yellow patterns), and Thermoproauctor, Calescibacterium (Calescamantes), Armatimonadota T1, Calditenuis aerorhuemensis 59, Acidilobaceae, Armatimonadota T2, Thermoflexus, and several others <2% at Octopus Spring (blue patterns) (Table 2 and Supplementary Table 1 show complete list of phylotypes). Abundances were calculated based on the fraction of mapped reads from random metagenome sequence (CheckM61). Taxonomic references are based on nucleotide identity (>95%) at either the phylum, order, family, or genus/species level. Source data are provided as a Source Data file.