Abstract
Microbial communities in oil-polluted desert soils have been rarely studied compared to their counterparts from freshwater and marine environments. We investigated bacterial diversity and changes therein in five desert soils exposed to different levels of oil pollution. Automated rRNA intergenic spacer (ARISA) analysis profiles showed that the bacterial communities of the five soils were profoundly different (analysis of similarities (ANOSIM), R = 0.45, P < 0.0001) and shared less than 20 % of their operational taxonomic units (OTUs). OTU richness was relatively higher in the soils with the higher oil pollution levels. Multivariate analyses of ARISA profiles revealed that the microbial communities in the S soil, which contains the highest level of contamination, were different from the other soils and formed a completely separate cluster. A total of 16,657 ribosomal sequences were obtained, with 42–89 % of these sequences belonging to the phylum Proteobacteria. While sequences belonging to Betaproteobacteria, Gammaproteobacteria, Bacilli, and Actinobacteria were encountered in all soils, sequences belonging to anaerobic bacteria from the classes Deltaproteobacteria, Clostridia, and Anaerolineae were only detected in the S soil. Sequences belonging to the genus Terriglobus of the class Acidobacteria were only detected in the B3 soil with the lowest level of contamination. Redundancy analysis (RDA) showed that oil contamination level was the most determinant factor that explained variations in the microbial communities. We conclude that the exposure to different levels of oil contamination exerts a strong selective pressure on bacterial communities and that desert soils are rich in aerobic and anaerobic bacteria that could potentially contribute to the degradation of hydrocarbons.
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Acknowledgments
The authors would like to express their great thanks to Mr. Abdulla Al-Harthy from Petroleum Development of Oman (PDO) for the organization of field trips to the sampling site and for his cooperation throughout the project. Mr. Jamal Al-Sabahi is also thanked for his assistance in the chemical analysis. This research was financially supported by The Research Council (TRC) of Oman (grant RC/SCI/BIOL/11/01).
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Figure 1S
GC/MS chromatograms showing the concentrations of crude oil fractions in the five studied oil-polluted desert soils performed directly after sampling (A) and concentrations (in ppm) of individual alkanes (C10-C30) in each sample as detected by GC analysis (B). (DOC 347 kb)
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Abed, R.M.M., Al-Kindi, S. & Al-Kharusi, S. Diversity of Bacterial Communities Along a Petroleum Contamination Gradient in Desert Soils. Microb Ecol 69, 95–105 (2015). https://doi.org/10.1007/s00248-014-0475-5
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DOI: https://doi.org/10.1007/s00248-014-0475-5