Euclidean-distance dendrogram based on the whole-cell fatty acid compositions of the sediment and rhizosphere PAH-degrading isolates. Sediment and rhizosphere isolates are denoted as PS and PR, respectively. In addition, strains isolated using naphthalene are indicated by an N, while phenanthrene- and biphenyl-enriched isolates are denoted by a P and B, respectively. ∗, isolate PR-P3 is an Arthrobacter sp.