Stream pollution concentration in riffle geomorphic units (Yzeron basin, France)

Namour, Philippe; Schmitt, Laurent; Eschbach, David; Moulin, Bertrand; Fantino, Guillaume; Bordes, Claire; Breil, Pascal

doi:10.1016/j.scitotenv.2015.05.057

Cited by 23 publications

(14 citation statements)

References 40 publications

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“…1 mS / m for hyporheic waters (average 0.368 ± 0.127 mS / m). These differences between the benthic and hyporheic waters are in agreement with those reported in Namour et al (2015). It is to be noted that these differences were previously found inversely related to the concentrations of dissolved oxygen.…”

Section: Resultssupporting

confidence: 93%

“…It is to be noted that these differences were previously found inversely related to the concentrations of dissolved oxygen. Namour et al (2015) reported about 3.7 mg dissolved oxygen per L in the hyporheic zone of one of the segment of the Chaudanne River used in this study, while it was of about 8.5 mg for the benthic waters. This is likely related to a significant consumption of oxygen by hyporheic inhabitants including bacteria.…”

Section: Resultsmentioning

confidence: 44%

“…The Yzeron watershed was investigated in this study through analyses of its tributary named La Chaudanne and of its outlet being connected to the Rhône River (Namour et al, 2015). Surface of the Yzeron watershed is of 129 km 2 .…”

Section: Methodsmentioning

confidence: 99%

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Human-Driven Microbiological Contamination of Benthic and Hyporheic Sediments of an Intermittent Peri-Urban River Assessed from MST and 16S rRNA Genetic Structure Analyses

et al. 2017

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Rivers are often challenged by fecal contaminations. The barrier effect of sediments against fecal bacteria was investigated through the use of a microbial source tracking (MST) toolbox, and by Next Generation Sequencing (NGS) of V5-V6 16S rRNA gene (rrs) sequences. Non-metric multi-dimensional scaling analysis of V5-V6 16S rRNA gene sequences differentiated bacteriomes according to their compartment of origin i.e., surface water against benthic and hyporheic sediments. Classification of these reads showed the most prevalent operating taxonomic units (OTU) to be allocated to Flavobacterium and Aquabacterium. Relative numbers of Gaiella, Haliangium, and Thermoleophilum OTU matched the observed differentiation of bacteriomes according to river compartments. OTU patterns were found impacted by combined sewer overflows (CSO) through an observed increase in diversity from the sewer to the hyporheic sediments. These changes appeared driven by direct transfers of bacterial contaminants from wastewaters but also by organic inputs favoring previously undetectable bacterial groups among sediments. These NGS datasets appeared more sensitive at tracking community changes than MST markers. The human-specific MST marker HF183 was strictly detected among CSO-impacted surface waters and not river bed sediments. The ruminant-specific DNA marker was more broadly distributed but intense bovine pollution was required to detect transfers from surface water to benthic and hyporheic sediments. Some OTU showed distribution patterns in line with these MST datasets such as those allocated to the Aeromonas, Acinetobacter, and Pseudomonas. Fecal indicators (Escherichia coli and total thermotolerant coliforms) were detected all over the river course but their concentrations were not correlated with MST ones. Overall, MST and NGS datasets suggested a poor colonization of river sediments by bovine and sewer bacterial contaminants. No environmental outbreak of these bacterial contaminants was detected.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 44%

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Human-Driven Microbiological Contamination of Benthic and Hyporheic Sediments of an Intermittent Peri-Urban River Assessed from MST and 16S rRNA Genetic Structure Analyses

et al. 2017

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“…Preliminary results showed a high sediment functioning heterogeneity according water flow, geomorphology, hyporheic and nutrient fluxes due to hydraulic conductivity and hydraulic gradient [23]. The redox cycling of organic C & N not only drive the micro-and macro-biological communities, but also have implications for global nutrient balances and climate change.…”

Section: Introductionmentioning

confidence: 97%

Bioremediation in Water Environment: Controlled Electro-Stimulation of Organic Matter Self-Purification in Aquatic Environments

Jobin¹,

Namour²

2017

AiM

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This review describes a new means of control and stimulation of microorganisms involved in the bioremediation of sediments and waterlogged soils. This emerging technology is derived from sedimentary microbial fuel cells, and consists in ensuring aerobic respiration of aerobic microbial populations in anaerobic conditions by means of a fixed potential anode in order to evacuate the electrons coming from the microbial respiratory chains. This review describes the conceptual basis of the electro-bioremediation, the material devices used (electrode set-ups and spacing), and finally studies the various devices published since the bench tests until the scarce in-field implementations.

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“…Soil sealing has important impacts on ecological functions and decreases water infiltration, biodiversity, and the capacity of soil to act as a carbon sink (Scalenghe and Marsan 2009;Khaledian et al 2016). Soil sealing has two major implications for overland flow dynamics: (i) the increased velocity and destructive impact of flash floods that may result in lost lives and high economic costs in the flooded areas (Barroca et al 2015;Elga et al 2015); and (ii) the increased amount of sediments and pollutants transported (Maniquiz-Redillas and Kim 2014; Li et al 2015) and deposited in water bodies (Moreno-Gonzalez et al 2013;Namour et al 2015), contributing to habitat degradation and reduction of the quality of the services provided by these ecosystems, as we will describe further.…”

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confidence: 99%

Preface

et al. 2016

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Stream pollution concentration in riffle geomorphic units (Yzeron basin, France)

Cited by 23 publications

References 40 publications

Human-Driven Microbiological Contamination of Benthic and Hyporheic Sediments of an Intermittent Peri-Urban River Assessed from MST and 16S rRNA Genetic Structure Analyses

Human-Driven Microbiological Contamination of Benthic and Hyporheic Sediments of an Intermittent Peri-Urban River Assessed from MST and 16S rRNA Genetic Structure Analyses

Bioremediation in Water Environment: Controlled Electro-Stimulation of Organic Matter Self-Purification in Aquatic Environments

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