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Effect of Bioremediation on the Microbial Community in Oiled Mangrove Sediments |
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| Authors: | Michelle A Ramsay Richard PJ Swannell Warren A Shipton Norman C Duke Russell T Hill |
| Institution: | aAustralian Institute of Marine Science, PMB No. 3, Townsville, Qld 4810, Australia bJames Cook University, Townsville, Qld 4811, Australia cNational Environmental Technology Centre, AEA Technology, Abingdon, Oxfordshire OX14 3ED, UK dUniversity of Queensland, St Lucia, Qld, Australia eCenter of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 East Pratt Street, Baltimore, MD 21202, USA |
| Abstract: | Bioremediation was conducted in the field on a mature Rhizophora stylosa mangrove stand on land to be reclaimed near Fisherman’s Landing Wharf, Gladstone Australia. Gippsland crude oil was added to six large plots (>40 m2) and three plots were left untreated as controls. Bioremediation was used to treat three oiled plots and the remaining three were maintained as oiled only plots. The bioremediation strategy consisted of actively aerating the sediment and adding a slow-release fertilizer in order to promote oil biodegradation by indigenous micro-organisms. Oil addition stimulated the numbers of alkane-degrading bacteria slightly to levels of 104–105/g sediment. Bioremediation of the oiled sediment had a marked effect on the alkane-degrading population, increasing the population size by three orders of magnitude from 105 to 108 cells/g of sediment. An effect of bioremediation on the growth of aromatic-degraders was detected with numbers of aromatic-degraders increasing from 104 to 106 cells/g of sediment. Active aeration and nutrient addition significantly stimulated the growth of hydrocarbon-degraders in oiled mangrove sediment in the field. |
| Keywords: | bacteria bioremediation degradation enumeration hydrocarbons oil spills |
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