The effects of oil pollution on the quantity of the bacteria in the soil of Abu Ali Island in the Arabian Gulf, Saudi Arabia, and isolation of efficient bacterial isolates from polluted soil in the Arabian Gulf

E.T.yeb, S.M.; Abed, K.F.

Arab Gulf Journal of Scientific Research 17(3): 423-440


ISSN/ISBN: 1015-4442
Accession: 003586059

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The effect of oil pollution on the quantity of heterotrophic aerobic bacteria in the oil-polluted soil and non-polluted soil in Saudi Arabia was estimated. Bacterial existence was re-estimated after one year of pollution. The results of this study showed oil pollution in the coastal environment to have a quantitative effect on the heterotrophic aerobic bacteria group. Bacterial counts in oil-polluted soil was noticeably lower than in the non-polluted soil. Bacterial counts varied according to the locations from which samples were taken. Re-estimation of bacterial counts varied from 75.7%, in the samples which were less affected by the crude oil, to 91.8% in the samples which were most affected by the crude oil. It was shown that the reduction in the total count of the heterotrophic aerobic bacteria, which occurred in the oil-polluted soil, was accompanied by a higher count of oil degrading bacteria which varied according to location. One year after the occurrence of the pollution, the total counts of heterotrophic aerobic bacteria and the oil-degrading bacteria in all samples increased. Oil pollution was the primary factor responsible for the varying bacteria contents of the samples. Ten of the most efficient oil-degrading bacterial isolates were isolated from polluted water. The isolates were found to belong to the following genera: 3 isolates of Sporosarcina ureae; 3 Bacillus cereus; 2 B. subtilis; 1 B. megaterium; 1 mixed culture of S. ureae and Bacillus megaterium.