1. Aliphatic Hydrocarbon Enhances Phenanthrene Degradation by Autochthonous Prokaryotic Communities from a Pristine Seawater.
- Author
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Rodrigues EM, Morais DK, Pylro VS, Redmile-Gordon M, de Oliveira JA, Roesch LFW, Cesar DE, and Tótola MR
- Subjects
- Alkanes, Alphaproteobacteria drug effects, Alphaproteobacteria metabolism, Bacteria classification, Bacteria genetics, Biodegradation, Environmental, Biodiversity, Brazil, DNA, Bacterial genetics, Ecosystem, Gammaproteobacteria drug effects, Gammaproteobacteria metabolism, High-Throughput Nucleotide Sequencing, Islands, Metagenomics, Microbial Consortia genetics, Petroleum Pollution adverse effects, Polycyclic Aromatic Hydrocarbons pharmacology, Pyrenes, RNA, Ribosomal, 16S metabolism, Water Pollutants, Bacteria drug effects, Bacteria metabolism, Hydrocarbons adverse effects, Microbial Consortia drug effects, Microbial Consortia physiology, Phenanthrenes metabolism, Seawater microbiology
- Abstract
The microbial diversity and functioning around oceanic islands is poorly described, despite its importance for ecosystem homeostasis. Here, we aimed to verify the occurrence of microbe-driven phenanthrene co-oxidation in the seawater surrounding the Trindade Island (Brazil). We also used Next-Generation Sequencing to evaluate the effects of aliphatic and polycyclic aromatic hydrocarbons (PAHs) on these microbial community assemblies. Microcosms containing seawater from the island enriched with either labelled (9-
14 C) or non-labelled phenanthrene together with hexadecane, weathered oil, fluoranthene or pyrene, and combinations of these compounds were incubated. Biodegradation of phenanthrene-9-14 C was negatively affected in the presence of weathered oil and PAHs but increased in the presence of hexadecane. PAH contamination caused shifts in the seawater microbial community-from a highly diverse one dominated by Alphaproteobacteria to less diverse communities dominated by Gammaproteobacteria. Furthermore, the combination of PAHs exerted a compounded negative influence on the microbial community, reducing its diversity and thus functional capacity of the ecosystem. These results advance our understanding of bacterial community dynamics in response to contrasting qualities of hydrocarbon contamination. This understanding is fundamental in the application and monitoring of bioremediation strategies if accidents involving oil spillages occur near Trindade Island and similar ecosystems.- Published
- 2018
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