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Title Initial oil concentration affects hydrocarbon biodegradation rates and bacterial community composition in seawater
Posted by Hernando Bacosa
Authors Hernando P. Bacosa, Andrew Kang, Kaijun Lu, Zhanfei Liu
Publication date 2021
Journal Marine Pollution Bulletin
Volume 162
Pages 111867
Publisher Elsevier
Abstract During oil spills in the field or for laboratory incubation studies, different oil concentrations are often encountered or applied, yet how initial oil concentration affects biodegradation rates of hydrocarbons and the development of oil degraders remains unclear. We incubated seawater for 50 d with different oil concentrations (0, 50, 100, 200, 400 and 800 ppm). n-Alkanes and polycyclic aromatic hydrocarbons (PAHs), and the bacterial community were analyzed periodically. Results show that the biodegradation rates of alkanes, derived from first order kinetics, decreased with increasing oil concentration, but percent residual was ~50% regardless of the initial concentration. In contrast, the biodegradation rates of PAHs increased with concentration, and the percent residual increased with oil concentration. Increasing oil concentration resulted in increased abundances of Rhodobacterales, Altererythrobacter, and Neptuniibacter. However, Alcanivorax abundance was barely detected in 400 and 800 ppm. Overall, oil concentration critically affected the degradation of hydrocarbons and the bacterial community.
Index terms / Keywords Oil concentration; Biodegradation; Bacterial community; Oil spill; Alkane; PAH