Microorganisms in the crude oil-producing areas of Ondo State, Nigeria

The microbial population of the sampling stations was determined in the study during the rainy and dry season. It was observed that crude oil-producing areas are thickly populated with microorganism compared with the control site. This could be as a result of post-pollution microbial activity. Example is in Ayetoro recording the highest of 240 x 10(5) cfu/ml compared with Sabomi having a record of 7x10(3) cfu/ml as the highest in these periods. Various microbial species were encountered during the study including common oil degraders like Pseudomonas spp., Bacillus spp., Proteus spp., Enterobacter spp. and Klebsiella spp. A total of one hundred and seventy five (175) microbes were isolated and identified during the study. This includes Bacillus species (18), Bacillus pasteurii (2), Bacillus cereus (5), Bacillus macerans (9), Bacillus circulans (16), Bacillus coagulans (2), Bacillus subtilis (1), Bacillus licheniformis (3), Bacillus alvei (1), Bacillus panthothemicus (1), Klebsiella species (12), Veillonella spp. (15), Pseudomonas spp. (17), Pseudomonas diminuta (2) Pseudomonas mallei (2), Pseudomonas pseudomallei (1), Pseudomonas aeruginosa (1), Micrococcus spp. (17), Micrococcus varians (2), Neisseria spp. (4), Streptococcus spp. (6), Streptococcus homonis (1), Proteus spp. (9), Staphylococcus spp. (8), Staphylococcus aureus (1) Sarcina maxima (1), Enterobacter spp. (9), Serratia spp. (4), Serratia marcescen (2) and Arthrobacter spp. (4).