Ecological risk potentials of petroleum hydrocarbons and heavy metals shape the bacterial communities of marine hydrosphere at Atlantic Ocean, Atlas Cove, Nigeria
No Thumbnail Available
Date
2021
Authors
Oyetibo, G.O
Ige, O.O
Obinani, P.K
Amund, O.O
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
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.
Description
Scholarly articles
Keywords
Atlantic ocean , Petroleum , Bacterial community , Pollution , Ecological risk , Research Subject Categories::NATURAL SCIENCES
Citation
Oyetibo, G.O Ige, O.O Obinani, P.K Amund, O.O. (2021). Ecological risk potentials of petroleum hydrocarbons and heavy metals shape the bacterial communities of marine hydrosphere at Atlantic Ocean, Atlas Cove, Nigeria. Journal of Environmental Management, 289