Trans-Atlantic voyage of petroleum often leads to marine pollution with petroleum hydrocarbons (PHs) and heavy metals (HMs) that defines structures of autochthonous bacteria in the hydrosphere. Bacterial taxa of marine sediments exposed to petroleum transport activities were profiled using 16S rDNA metagenomics and correlated with the geochemistry to establish their impact on the microbiome. The physico-chemistry of the marine systems revealed varied degrees of contamination with PHs and HMs exceeding recommended threshold for aquatic life. Ecological risk assessment based on organic carbon of the sediment established phenanthrene, anthracene, and pyrene posed high risks (index risk quotient >32) to marine life. The most dominant phylum of the 44 bacterial phyla in the marine-sphere was Proteobacteria with relative abundance of 45–77% in the sampling locations. Relative dominance of Proteobacteria in the sediments spanned Gammaproteobacteria (17–25%), Deltaproteobacteria (12–20%), and Alphaproteobacteria (7–14%). Whereas, more operational taxonomic units (OTUs) belonging to Epsilonproteobacteria (19 ± 2.4%) were found in estuarine sediment unlike < 0.5% relative abundances obtained from oceanic sediments. Sulfurimonas apparently dominated the bacterial genera with up to 2.16 ± 0.19% abundance in oceanic sediments. Canonical correspondence analysis revealed that PHs shaped the structure of bacterial OTUs in oceanic sediments where petroleum loading/offloading occurs unlike in some kilometres a yonder where HMs correlated with the bacteria structure. The dominant bacteria might possibly pivotal to ecophysiologies of hydrocarbon contaminated marine environment, and would be pertinent to biotechnological applications for possible bioremediation campaign.

跨大西洋航行的石油通常会导致海洋中石油烃（PHs）和重金属（HMs）的污染，这些物质定义了水圈中土生细菌的结构。使用16S rDNA宏基因组学对暴露于石油运输活动的海洋沉积物的细菌类群进行了分析，并将其与地球化学联系起来，以确定它们对微生物组的影响。海洋系统的物理化学表明，PH和HM的污染程度不同，超过了建议的水生生物阈值。根据沉积物中已建立的菲，蒽和pyr的有机碳进行的生态风险评估对海洋生物构成了高风险（指数风险商> 32）。海洋圈中44个细菌门中最主要的门是Proteobacteria，在采样位置的相对丰度为45-77％。沉积物中变形杆菌的相对优势分布在伽马变形杆菌（17–25％），三角洲变形杆菌（12–20％）和阿尔法变形细菌（7-14％）之间。相比之下，在河口沉积物中发现了更多的属于Epsilon变形细菌的操作分类单位（OTU）（19±2.4％），与从海洋沉积物中获得的相对丰度相比却不足<0.5％。硫酸盐单胞菌显然以最大2.16±0.19％的海洋沉积物丰度占据了细菌属。典型的对应分析表明，PHs决定了海洋沉积物中细菌OTU的结构，在这些沉积物中发生了石油加/卸载，而在HMs与细菌结构相关的数公里以外的地方。优势细菌可能对受碳氢化合物污染的海洋环境的生态生理至关重要，并且与可能进行生物修复活动的生物技术应用有关。