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Small-scale oxygen distribution determines the vinyl chloride biodegradation pathway in surficial sediments of riverbed hyporheic zones

Siavash Atashgahi, Farai Maphosa, Eylem Dogan Subasi, Hauke Smidt, Dirk Springael and Winnie Dejonghe (2013) FEMS MICROBIOLOGY ECOLOGY. 84(1). p.133-142
abstract
Surficial riverbed sediments are often characterized by sharp redox gradients between the aerobic benthic sediment and underlying anoxic sediment, potentially representing an ideal niche for aerobic and anaerobic vinyl chloride (VC) degraders. To test this, the fate of VC in aerobic and anaerobic microcosms containing surficial sediment of a riverbed hyporheic zone receiving VC-contaminated groundwater was explored. Quantitative PCR showed that Dehalococcoides 16S rRNA gene and VC reductive dehalogenaseencoding genes (vcrA, bvcA) were highly enriched in anaerobic microcosms, with stoichiometric conversion of VC to ethene. In aerobic microcosms, etnC and etnE involved in aerobic ethene/VC oxidation were enriched with concomitant low or no accumulation of ethene. However, Dehalococcoides 16S rRNA gene, vcrA and bvcA copy numbers were also enriched in oxygen-exposed microcosms containing sediment with high organic carbon and small grain size, whereas they were reduced in oxygen-exposed sediment with low organic carbon and larger grain size in line with extensive oxygen penetration into the sediment. These results suggest the coexistence and coactivity of anaerobic and aerobic VC degraders in the same small volume of surficial sediment and that oxygen distribution, as determined by sediment grain size and organic matter content, affects the local VC-degrading bacterial community and VC biodegradation pathway.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
reductive dechlorination, vinyl chloride, aerobic biodegradation, hyporheic zone, riverbed sediment, CHLORINATED ALIPHATIC-HYDROCARBONS, DEHALOCOCCOIDES SP STRAIN, CONTAMINATED GROUNDWATER, TIDAL FLAT, ETHENE, IDENTIFICATION, ATTENUATION, COMMUNITY, PERCHLOROETHENE, BIOREMEDIATION
journal title
FEMS MICROBIOLOGY ECOLOGY
FEMS Microbiol. Ecol.
volume
84
issue
1
pages
133 - 142
Web of Science type
Article
Web of Science id
000315912200011
JCR category
MICROBIOLOGY
JCR impact factor
3.875 (2013)
JCR rank
26/119 (2013)
JCR quartile
1 (2013)
ISSN
0168-6496
DOI
10.1111/1574-6941.12044
language
English
UGent publication?
no
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
4269079
handle
http://hdl.handle.net/1854/LU-4269079
date created
2014-02-06 17:17:41
date last changed
2016-12-19 15:44:58
@article{4269079,
  abstract     = {Surficial riverbed sediments are often characterized by sharp redox gradients between the aerobic benthic sediment and underlying anoxic sediment, potentially representing an ideal niche for aerobic and anaerobic vinyl chloride (VC) degraders. To test this, the fate of VC in aerobic and anaerobic microcosms containing surficial sediment of a riverbed hyporheic zone receiving VC-contaminated groundwater was explored. Quantitative PCR showed that Dehalococcoides 16S rRNA gene and VC reductive dehalogenaseencoding genes (vcrA, bvcA) were highly enriched in anaerobic microcosms, with stoichiometric conversion of VC to ethene. In aerobic microcosms, etnC and etnE involved in aerobic ethene/VC oxidation were enriched with concomitant low or no accumulation of ethene. However, Dehalococcoides 16S rRNA gene, vcrA and bvcA copy numbers were also enriched in oxygen-exposed microcosms containing sediment with high organic carbon and small grain size, whereas they were reduced in oxygen-exposed sediment with low organic carbon and larger grain size in line with extensive oxygen penetration into the sediment. These results suggest the coexistence and coactivity of anaerobic and aerobic VC degraders in the same small volume of surficial sediment and that oxygen distribution, as determined by sediment grain size and organic matter content, affects the local VC-degrading bacterial community and VC biodegradation pathway.},
  author       = {Atashgahi, Siavash and Maphosa, Farai and Dogan Subasi, Eylem and Smidt, Hauke and Springael, Dirk  and Dejonghe, Winnie},
  issn         = {0168-6496},
  journal      = {FEMS MICROBIOLOGY ECOLOGY},
  keyword      = {reductive dechlorination,vinyl chloride,aerobic biodegradation,hyporheic zone,riverbed sediment,CHLORINATED ALIPHATIC-HYDROCARBONS,DEHALOCOCCOIDES SP STRAIN,CONTAMINATED GROUNDWATER,TIDAL FLAT,ETHENE,IDENTIFICATION,ATTENUATION,COMMUNITY,PERCHLOROETHENE,BIOREMEDIATION},
  language     = {eng},
  number       = {1},
  pages        = {133--142},
  title        = {Small-scale oxygen distribution determines the vinyl chloride biodegradation pathway in surficial sediments of riverbed hyporheic zones},
  url          = {http://dx.doi.org/10.1111/1574-6941.12044},
  volume       = {84},
  year         = {2013},
}

Chicago
Atashgahi, Siavash, Farai Maphosa, Eylem Dogan Subasi, Hauke Smidt, Dirk Springael, and Winnie Dejonghe. 2013. “Small-scale Oxygen Distribution Determines the Vinyl Chloride Biodegradation Pathway in Surficial Sediments of Riverbed Hyporheic Zones.” Fems Microbiology Ecology 84 (1): 133–142.
APA
Atashgahi, S., Maphosa, F., Dogan Subasi, E., Smidt, H., Springael, D., & Dejonghe, W. (2013). Small-scale oxygen distribution determines the vinyl chloride biodegradation pathway in surficial sediments of riverbed hyporheic zones. FEMS MICROBIOLOGY ECOLOGY, 84(1), 133–142.
Vancouver
1.
Atashgahi S, Maphosa F, Dogan Subasi E, Smidt H, Springael D, Dejonghe W. Small-scale oxygen distribution determines the vinyl chloride biodegradation pathway in surficial sediments of riverbed hyporheic zones. FEMS MICROBIOLOGY ECOLOGY. 2013;84(1):133–42.
MLA
Atashgahi, Siavash, Farai Maphosa, Eylem Dogan Subasi, et al. “Small-scale Oxygen Distribution Determines the Vinyl Chloride Biodegradation Pathway in Surficial Sediments of Riverbed Hyporheic Zones.” FEMS MICROBIOLOGY ECOLOGY 84.1 (2013): 133–142. Print.