Fig. 5

Phylogenetic trees, abundance heat maps, and diversity profiles of representative genes in different layers of the CS site. Only branches whose supporting values were higher than 0.75 are represented in the phylogenetic trees. The outer heat maps illustrate logarithmically transformed abundance. The inner strips represent the types of gene sequence clusters (GSCs), while the heat maps at the bottom-right inset for each gene show the diversity profiles measured by Hill numbers, logarithmically transformed, and scaled by row. The colors of functional gene names represent the metabolic processes in which they participate. a SSU rRNA gene. b mcrA for anaerobic oxidation of methane (orange). c dsrA for dissimilatory sulfate reduction (green). d cysH for assimilatory sulfate reduction (yellow-green). e narG for denitrification (light blue). f nifH for nitrogen fixation (blue)