Oil spill, 16S rRNA, Gulf of Mexico, Deepwater Horizon, Bacterial community, Particulate alkanes, Biodegradation, Environmental, Petroleum Pollution, Bacteria - metabolism, Environmental Monitoring, Seawater - microbiology, Alkanes - analysis, Hydrocarbons - metabolism, Biodiversity, Bacteria - genetics, Water Pollutants - metabolism, Hydrocarbons - analysis...