Appendix A. Tables and figures showing dissimilarity among all the five sites and between pairwise sites by NPMANOVA (Table A1, A2), and decrease of microbial functional genes richness (Fig. A1) and diversity (Fig. A2–A6) along with long-term oil contamination.

Tables and figures showing dissimilarity among all the five sites and between pairwise sites by NPMANOVA (Table A1, A2), and decrease of microbial functional genes richness (Fig. A1) and diversity (Fig. A2–A6) along with long-term oil contamination.