Permeable Reactive Barriers Designed To Mitigate Eutrophication Alter Bacterial Community Composition and Aquifer Redox Conditions

Permeable reactive barriers (PRBs) consist of a labile carbon source that is positioned to intercept nitrate-laden groundwater to prevent eutrophication. Decomposition of carbon in the PRB drives groundwater anoxic, fostering microbial denitrification. Such PRBs are an ideal habitat to examine micro...

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Bibliographic Details
Published in:Applied and Environmental Microbiology 2015-10, Vol.81 (20), p.7114-7124
Main Authors: Hiller, Kenly A, Foreman, Kenneth H, Weisman, David, Bowen, Jennifer L
Format: Article
Language:English
Subjects:
Bacteria
Bacteria - classification
Bacteria - genetics
Biota
Carbon - metabolism
Denitrification
DNA, Ribosomal - chemistry
DNA, Ribosomal - genetics
Estuaries
Eutrophication
Groundwater
Groundwater - chemistry
Groundwater - microbiology
Massachusetts
Microbial Ecology
Microbiology
Molecular Sequence Data
Nitrates - analysis
Oxidation-Reduction
Oxygen - analysis
Phylogeny
RNA, Ribosomal, 16S - genetics
Sequence Analysis, DNA
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Summary:Permeable reactive barriers (PRBs) consist of a labile carbon source that is positioned to intercept nitrate-laden groundwater to prevent eutrophication. Decomposition of carbon in the PRB drives groundwater anoxic, fostering microbial denitrification. Such PRBs are an ideal habitat to examine microbial community structure under high-nitrate, carbon-replete conditions in coastal aquifers. We examined a PRB installed at the Waquoit Bay National Estuarine Research Reserve in Falmouth, MA. Groundwater within and below the PRB was depleted in oxygen compared to groundwater at sites upgradient and at adjacent reference sites. Nitrate concentrations declined from a high of 25 μM upgradient and adjacent to the barrier to
ISSN:0099-2240
1098-5336
1098-6596
DOI:10.1128/AEM.01986-15