文摘
Understanding the effect of conventional and alternative fuels on the marine bacterial community is crucial, as it pertains to the impact, biodegradation, and final fate of these fuels in the environment. Metagenomics analysis demonstrated that conventional and alternative fuels promoted the growth of Proteobacteria. Marinobacter and Desulfovibrio were predominant in seawater exposed to conventional jet propellant-5 (JP-5), while Hyphomonas and Rhodovulum were most abundant in seawater with hydroprocessed renewable jet fuel (HRJ) and conventional F-76 diesel, respectively. The phyla Bacteroidetes, Firmicutes, and Lentisphaerae were underrepresented in samples with fuel, and these phyla were largely comprised of unclassified bacteria. Culture-dependent tests isolated several of the same genera detected in high abundance by metagenomics DNA sequencing, including Marinobacter, Rhodovulum, and Halobacillus. Growth studies in fuel and gas chromatography analysis demonstrated that isolates grew in fuel and metabolized hydrocarbons efficiently. The hydrocarbon degradation profile of each bacterium was conserved from conventional to alternative fuels. The study indicated that bacteria must out-compete others to get established and proliferate. Competition between hydrocarbon degraders was an important factor affecting the bioremediation process. This study provides insights into the growth characteristics of hydrocarbon-degrading bacteria and the effects of fuel on marine bacterial communities.
