Figure 5. Principal coordinate analysis of the five distinct oceans based on the unweighted UniFrac distance matrix of phylotype sequences.

Each circle is sized according to the concentration of dissolved O₂ and color-coded according to the in situ seawater temperature. The percentage of variation explained by the plotted principal coordinate (PC) is indicated on the axes. Sample designations: RS, Red Sea; HOT, Hawaii Ocean Time Series; BATS, Bermuda Atlantic Time Series; ETPS, Eastern Tropical South Pacific; MED, Mediterranean Sea; MarSea, Marmara Sea; MVD, Matapan-Vavilov Deep; and PRT, Puerto-Rico Trench. More details are provided in Table S3.