Table 2. Hydrocarbon degradation gene distributions.

Group	HCD gene count	Relative abundance (%)	Normalized to CDS (%)a
Gammaproteobacteria	180	66	55
Unbinned	67	25	22
Deltaproteobacteria	13	5	11
Bacteroidetes	9	3	7
Alphaproteobacteria	2	1	2
Phage associated	2	1	3
Total	273	100	100

^aNormalized to total coding DNA sequence (CDS) per group.