Relative abundance of part of the genomes detected in the SPG at stations (St.) 4 (circle), 6 (triangle), and 8 (star). (A) AEGEAN169. (B) SAR11. (C) SAR116. (D) SAR86. The pronounced partitioning of the different microorganisms within the water column is clearly visible. TAD80—truncated average sequencing depth using the middle 80% of the sequence base positions.