Fig. 2: Percentage of amplicon sequence variants (ASVs) for each of three genes, 16 S rRNA, ribE, and proB, detected from gill tissue masses or single bacteriocytes.

Nucleotide diversities of the three genes were analysed for each mass of gill tissue from five Bathymodiolus septemdierum individuals (indiv. 1–5, light green) and each single bacteriocyte from four individuals (indiv. 2–5, light magenta). Percentages of ASV ≥ 10% are shown in each bubble. Very minor ASVs of a maximum of 1% or less throughout all samples were omitted from the figure, but the data is available in Supplementary Fig. S4 and Supplementary Table S4.