Soil Microcosm # Bacterial Species Benzene Ethyl-benzene Xylene Total  Representation % 1 Pseudomonas resinovorans 8 (0.53) 1 (0.07) 5 (0.33) 14 31.11 2 Pseudomonas geniculata1 0 (0.00) 12 (0.80) 1 (0.07) 13 28.89 3 Pseudomonas sp 0 (0.00) 0 (0.00) 1 (0.07) 1 2.22 4 Pseudomonas mosselii 0 (0.00) 1 (0.07) 2 (0.13) 3 6.67 5 Pseudomonas geniculata2 1 (0.07) 0 (0.00) 0 (0.00) 1 2.22 6 Comamonastestosteroni 0 (0.00) 0 (0.00) 6 (0.40) 6 13.33 7 Delftiasp 1 (0.07) 0 (0.00) 0 (0.00) 1 2.22 8 Bacillus thuringiensis 0 (0.00) 1 (0.07) 0 (0.00) 1 2.22 9 Acinetobactercalcoaceticus1 1 (0.07) 0 (0.00) 0 (0.00) 1 2.22 10 Acinetobactersp 3 (0.20) 0 (0.00) 0 (0.00) 3 6.67 11 Acinetobactercalcoaceticus2 1 (0.07) 0 (0.00) 0 (0.00) 1 2.22   Total 15 15 15 45 100

Table 3: Occurrences of the 11 bacterial species isolated from the soil contaminated microcosms. The relative abundances (Pi) relative to total abundance of each species are in parenthesis.