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Title of Journal: Microb Ecol

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Abbravation: Microbial Ecology

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Springer-Verlag

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DOI

10.1007/s00784-009-0267-3

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1432-184X

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Bacterial Community Dynamics during Bioremediation

Authors: S Vázquez B Nogales L Ruberto E Hernández J ChristieOleza A Lo Balbo R Bosch J Lalucat W Mac Cormack
Publish Date: 2008/08/07
Volume: 57, Issue: 4, Pages: 598-
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Abstract

The effect of nutrient and inocula amendment in a bioremediation field trial using a nutrientpoor Antarctic soil chronically contaminated with hydrocarbons was tested The analysis of the effects that the treatments caused in bacterial numbers and hydrocarbon removal was combined with the elucidation of the changes occurring on the bacterial community by 16S rDNAbased terminal restriction fragment length polymorphism TRFLP typing and the detection of some of the genes involved in the catabolism of hydrocarbons All treatments caused a significant increase in the number of bacteria able to grow on hydrocarbons and a significant decrease in the soil hydrocarbon content as compared to the control However there were no significant differences between treatments Comparison of the soil TRFLP profiles indicated that there were changes in the structure and composition of bacterial communities during the bioremediation trial although the communities in treated plots were highly similar irrespective of the treatment applied and they had a similar temporal dynamics These results showed that nutrient addition was the main factor contributing to the outcome of the bioremediation experiment This was supported by the lack of evidence of the establishment of inoculated consortia in soils since their characteristic electrophoretic peaks were only detectable in soil profiles at the beginning of the experiment Genetic potential for naphthalene degradation evidenced by detection of nahAc gene was observed in all soil plots including the control In treated plots an increase in the detection of catechol degradation genes nahH and catA and in a key gene of denitrification nosZ was observed as well These results indicate that treatments favored the degradation of aromatic hydrocarbons and probably stimulated denitrification at least transiently This mesocosm study shows that recovery of chronically contaminated Antarctic soils can be successfully accelerated using biostimulation with nutrients and that this causes a change in the indigenous bacterial communities and in the genetic potential for hydrocarbon degradationThis research was supported by grants from the Argentinean Antarctic Institute IAA no 42 the National Agency for Scientific and Technical Researches PICTO 11555 and the University of Buenos Aires UBACyT U007 as well as by a shortterm travel fellowship from the Argentinean Research Council CONICET Research at the University of the Balearic Islands UIB was supported by grants VEM200320565 and CTM200501783 from the Spanish Ministry of Education and Science MEC BN was supported by a contract from the program “Ramón y Cajal” from MEC and JCO by a fellowship of the Balearics Autonomous Government The experience and assistance of logistic and technical personnel at Tte Jubany Antarctic Station is also highly appreciated as well as the support of the ScientificTechnical Services of the UIB during the operation of the genetic analyzer for fragment analysisRelative moisture content of soil during the field experiment Black bars community control plot CC white bars biostimulated plots AB light gray bars biostimulated and bioaugmented plots with M10 consortia M10 and dark gray bars biostimulated and bioaugmented plots with J13 consortia J13 In the treated plots the first bar corresponds to plot 1 the second one to plot 2 and the third one to plot 3 GIF 20 kb

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  2. Characterization of Bacterial Communities in Sediments Receiving Various Wastewater Effluents with High-Throughput Sequencing Analysis
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