Figure 4.

Variation in the divers’ oral microbiota before (day 0), during the bottom phase (days 2 and 5), and after decompression (day 28) from heliox saturation diving. (A–E) Observed shifts in the relative abundance of the five most abundant bacterial phyla, along with their significantly altered genera. For each time-point: mean (♦) and individual values are shown. Error bars are ±1 SD (^*p ≤ 0.05; ^**p ≤ 0.01; and ^***p ≤ 0.001). The relative abundance is given in percentage of total bacterial sequences.