Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR

In the basin of Mekong, over 70 million people rely on unimproved surface water for their domestic requirements. Surface water is often contaminated with fecal matter and yet little information exists on the underlying mechanisms of fecal contamination in tropical conditions at large watershed scale...

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Vydáno v:Scientific reports Ročník 11; číslo 1; s. 3460 - 17
Hlavní autoři: Nakhle, Paty, Ribolzi, Olivier, Boithias, Laurie, Rattanavong, Sayaphet, Auda, Yves, Sayavong, Saysongkham, Zimmermann, Rosalie, Soulileuth, Bounsamay, Pando, Anne, Thammahacksa, Chanthamousone, Rochelle-Newall, Emma J., Santini, William, Martinez, Jean-Michel, Gratiot, Nicolas, Pierret, Alain
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 10.02.2021
Nature Publishing Group
Nature Portfolio
Témata:
631/326/171
631/326/41
631/326/421
631/326/47
692/699/1503
704/172
704/242
704/47
Bacteriology
Contamination
E coli
Earth Sciences
Escherichia coli
Fecal coliforms
Feces
Humanities and Social Sciences
Hydrologic regime
Hydrology
Land use
Life Sciences
Microbiology and Parasitology
multidisciplinary
Outlets
Rainy season
Science
Science (multidisciplinary)
Sciences of the Universe
Seasonal variations
Surface water
Suspended sediments
Water pollution
Laos
LAOS
MEKONG BASSIN
ISSN:2045-2322, 2045-2322
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Shrnutí:In the basin of Mekong, over 70 million people rely on unimproved surface water for their domestic requirements. Surface water is often contaminated with fecal matter and yet little information exists on the underlying mechanisms of fecal contamination in tropical conditions at large watershed scales. Our objectives were to (1) investigate the seasonality of fecal contamination using Escherichia coli as fecal indicator bacteria (FIB), and (2) establish links between the fecal contamination in stream water and its controlling factors (hydrology and land use). We present the results of (1) a sampling campaign at the outlet of 19 catchments across Lao PDR, in both the dry and the rainy seasons of 2016, and (2) a 10-day interval monitoring conducted in 2017 and 2018 at three point locations of three rivers (Nam Ou, Nam Suang, and Mekong) in northern Lao PDR. Our results show the presence of fecal contamination at most of the sampled sites, with a seasonality characterized by higher and extreme E. coli concentrations occurring during the rainy season. The highest E. coli concentrations, strongly correlated with total suspended sediment concentrations, were measured in catchments dominated by unstocked forest areas, especially in mountainous northern Lao PDR and in Vientiane province.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-82891-0