Fig. 5: Electron transfer and carboxylation genes in microbial populations from Conch and Octopus Springs.

Keystone microbial populations present in both springs (A), or populations present only in Conch (B) or only in Octopus (C) Springs [sox sulfur oxidation pathway, aio arsenite oxidase, sqr sulfide:quinone oxidoreductase, ttr tetrathionate reductase, psr polysulfide reductase, dsr dissimilatory sulfite/sulfate reductase, hco heme Cu oxidases, cytbd cytochrome bd ubiquinol oxidase, cydAA’ archaeal cytochrome oxygen reductase, ccl/ccs citryl-CoA lyase/citryl-coA synthetase, fdh formate dehydrogenase, acc acetyl CoA carboxylase, por pyruvate oxidoreductase].