Fig. 4

Distribution and taxonomy of marker genes involved in the degradation of aromatic compounds in the Arctic Ocean. a Normalized abundance of genes annotated with KEGG orthology numbers (KOs) marker of aromatic degradation pathways in the 4 different water features. b Normalized abundance of transcripts annotated with KOs marker of aromatic degradation pathways in the 4 different water features. c Estimated fraction of the microbiomes harboring genes annotated with KOs marker of aromatic degradation pathways in the 4 different water column features. The line in boxes represents the medians. The bottom and upper hinges of the box represent the 25th and 75th percentiles. Whiskers extend to the smallest and largest values (no further than 1.5× the interquartile range). d Taxonomy of genes annotated with KOs marker of aromatic degradation pathways in the 4 different water column features. Numbers within pie charts represent the number of gene clusters (clustered at 95% identity) identified in each water column feature. Red, surface samples; yellow, SCM samples; blue, FDOMmax samples; black, deep samples