FIG 4.

Relative sequence abundance of OTUs with significant associations to diesel or crude oil input after 71 days of incubation at 4°C. Bubble size indicates OTU relative abundance (%), with missing bubbles indicating no sequence reads. OTUs are labeled according to closest cultured relatives identified following NCBI BLAST searching with sequence identities (%) shown in parentheses. OTUs are grouped according to significant associations identified by “indicspecies” as those strongly correlated with both diesel and crude oil contamination (A), those correlated with the presence of diesel only (B), or crude oil only (C).