Figure 1. The 72 operational taxonomic units (OTUs) commonly (≥75%) identified in saliva of the individuals in the lowest quintile of phylogenetic diversity.

The OTUs are ordered according to a phylogenetic tree built based on the 16S rRNA gene sequences using FastTree⁵⁰; the tree is described in the center of the diagram. Mean relative abundance of each OTU in the individuals in the lowest PD quintile is shown as a blue bar. Of the 72 OTUs, 22 with a mean relative abundances of ≥1% in the saliva of individuals in the lowest PD quintile were shown in bold. Abbreviations: Mor; Moraxella; Ori, Oribacterium; Meg, Megasphaera; Lep, Leptotorichia; Fus, Fusobacterium; Cam, Campylobacter; Lau, Lautropia; All, Alloprevotella; Ber; Bergeyella; Eub, Eubacterium; Ato, Atopobium; Sol, Solobacterium; Abi, Abiotrophia.