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Biodegradation of hydrocarbons by indigenous populations of microorganisms found in petroleum-contaminated water sources represents one of the primary mechanisms by which petroleum and other hydrocarbon pollutants are eliminated from the aquatic environment. The identification of these microorganisms, which have capabilities to convert the majority of toxic hydrocarbons into compounds that are less harmful for end-users, is therefore crucial for bioremediation purposes. The aim of this study was to profile the microbial diversity of two South African petroleum-contaminated water aquifer sites and to determine the microbial adaptation to hydrocarbon degradation using a metagenomics approach. The sequenced samples revealed that protozoa (62.04%) were found to be the most dominant group, followed by fungi (24.49%), unknown (12.87%), and finally other sequences such as Animalia and plantae which were <(0.10%) domains in the first oil-polluted aquifer site. In the second site, protozoa (61.90%), unknown (16.51%), fungi (11.41%) in that order. According to the classification at the genus level, the dominant group was  Naegleria  (15.21%), followed by  Vorticella  (6.67%) as the only ciliated protozoan genus, other species such as  Arabidopsis  (2.97%),  Asarum  (1.84%)  Populus  (1.04%) were significantly low and drastically lower in the first site. Regarding the second site, the dominant group was  Naegleria  (18.29%) followed by  Colpoda  (9.86%) with the remainder of the genera representing <2%. Overall results demonstrated the ability of various groups of microorganisms to adapt and survive in petroleum oil-polluted water sites regardless of their respective distributions and this can be explored further for their role in bioremediation and environmental management.

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Metagenomic profiling for assessing microbial diversity and microbial adaptation to degradation of hydrocarbons in two South African petroleum-contaminated water aquifers