

FOLLOWUS
1.Key Laboratory of Coastal Biology and Bioresource Utilization, Yantai Institute of Costal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
HU Xiaoke, xkhu@yic.ac.cn
Received:09 December 2016,
Accepted:17 April 2017,
Online First:07 June 2017,
Published:2018-07
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Yanyu SUN, Hui WANG, Junde LI, et al. Nutrient-enhanced
Yanyu SUN, Hui WANG, Junde LI, et al. Nutrient-enhanced
Bioremediation
is an effective and environment-friendly method of cleaning up crude oil pollution after an oil spill. However
the in situ bioremediation of crude oil is usually inhibited by deficiency of inorganic nutrients. To understand the effects of nutrient addition on the bioremediation of crude oil and the succession of bacterial communities during process of bioremediation
microcosms containing oilcontaminated sediments were constructed and biodegradation of crude oil was assessed based on the depletion of different ingredients. We used two culture-independent methods
denaturing gradient gel electrophoresis and a 16S rRNA gene based clone library
to analyze the succession of bacterial communities. The results suggested
n
-alkanes were degraded after 30 days and that nutrient amendments significantly improved the efficiency of their biodegradation. Moreover
oil contamination and nutrient amendments could dramatically change bacterial community structures. Lower diversity was detected after being contaminated with oil. For instance
bacterial clones affiliated with the phylum Armatimonadetes
Firmicutes
Gemmatimonadetes
and Planctomycetes and the class Deltaproteobacteria and Epsilonproteobacteria could not be identified after 30 days of incubation with crude oil. However
"professional hydrocarbonocastic bacteria" became abundant in samples treated with oil during the bioremediation period
while these clones were almost completely absent from the control plots. Interestingly
bioinformatics analysis showed that even when dramatic differences in oil biodegradation efficiency were observed
bacterial communities in the plots with nutrient amendments were not significantly different from those in plots treated with oil alone. These findings indicated that nutrient amendments could stimulate the process of biodegradation but had less impact on bacterial communities. Overall
nutrient amendments might be able to stimulate the growth of n-alkane degrading bacteria.
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