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Changes in the composition of bacteria at class level in incubation experiments with or without crude oil. Filtered surface water (SW) or filtered bottom water (BW) inoculated with bottom water (1537 m) bacterial community (BI) or with surface water (2 m) bacterial community (SI). Treatments were incubated at 4 or 24°C. Only abundances greater than 2% in at least one of the samples are shown. The numbers on horizontal axis indicate the days of incubation.
