title: High bacterial biodiversity increases degradation performance of hydrocarbons during bioremediation of contaminated harbor marine sediments.
abstract: We investigated changes of bacterial abundance and biodiversity during bioremediation experiments carried out on oxic and anoxic marine harbor sediments contaminated with hydrocarbons. Oxic sediments, supplied with inorganic nutrients, were incubated in aerobic conditions at 20 °C and 35 °C for 30 days, whereas anoxic sediments, amended with organic substrates, were incubated in anaerobic conditions at the same temperatures for 60 days. Results reported here indicate that temperature exerted the main effect on bacterial abundance, diversity and assemblage composition. At higher temperature bacterial diversity and evenness increased significantly in aerobic conditions, whilst decreased in anaerobic conditions. In both aerobic and anaerobic conditions, biodegradation efficiencies of hydrocarbons were significantly and positively related with bacterial richness and evenness. Overall results presented here suggest that bioremediation strategies, which can sustain high levels of bacterial diversity rather than the selection of specific taxa, may significantly increase the efficiency of hydrocarbon degradation in contaminated marine sediments.
authors.affiliation: Department of Life and Environmental Sciences, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy. a.dellanno@univpm.it
authors.forename: Antonio
authors.initials: A
authors.lastname: Dell'Anno
authors.forename: Francesca
authors.initials: F
authors.lastname: Beolchini
authors.forename: Laura
authors.initials: L
authors.lastname: Rocchetti
authors.forename: Gian Marco
authors.initials: GM
authors.lastname: Luna
authors.forename: Roberto
authors.initials: R
authors.lastname: Danovaro
mesh_terms: D001673:Biodegradation, Environmental; D044822:Biodiversity; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology*; D006838:Hydrocarbons / Q000032:analysis / Q000378:metabolism*; D012623:Seawater / Q000382:microbiology; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D006838:Hydrocarbons; D014874:Water Pollutants, Chemical