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

Abstract 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 waters...

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Autores principales:	Paty Nakhle, Olivier Ribolzi, Laurie Boithias, Sayaphet Rattanavong, Yves Auda, Saysongkham Sayavong, Rosalie Zimmermann, Bounsamay Soulileuth, Anne Pando, Chanthamousone Thammahacksa, Emma J. Rochelle-Newall, William Santini, Jean-Michel Martinez, Nicolas Gratiot, Alain Pierret
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bcc8721562294313b125c8e53c463268
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spelling	oai:doaj.org-article:bcc8721562294313b125c8e53c4632682021-12-02T14:26:47ZEffects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR10.1038/s41598-021-82891-02045-2322https://doaj.org/article/bcc8721562294313b125c8e53c4632682021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82891-0https://doaj.org/toc/2045-2322Abstract 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.Paty NakhleOlivier RibolziLaurie BoithiasSayaphet RattanavongYves AudaSaysongkham SayavongRosalie ZimmermannBounsamay SoulileuthAnne PandoChanthamousone ThammahacksaEmma J. Rochelle-NewallWilliam SantiniJean-Michel MartinezNicolas GratiotAlain PierretNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Paty Nakhle Olivier Ribolzi Laurie Boithias Sayaphet Rattanavong Yves Auda Saysongkham Sayavong Rosalie Zimmermann Bounsamay Soulileuth Anne Pando Chanthamousone Thammahacksa Emma J. Rochelle-Newall William Santini Jean-Michel Martinez Nicolas Gratiot Alain Pierret Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
description	Abstract 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.
format	article
author	Paty Nakhle Olivier Ribolzi Laurie Boithias Sayaphet Rattanavong Yves Auda Saysongkham Sayavong Rosalie Zimmermann Bounsamay Soulileuth Anne Pando Chanthamousone Thammahacksa Emma J. Rochelle-Newall William Santini Jean-Michel Martinez Nicolas Gratiot Alain Pierret
author_facet	Paty Nakhle Olivier Ribolzi Laurie Boithias Sayaphet Rattanavong Yves Auda Saysongkham Sayavong Rosalie Zimmermann Bounsamay Soulileuth Anne Pando Chanthamousone Thammahacksa Emma J. Rochelle-Newall William Santini Jean-Michel Martinez Nicolas Gratiot Alain Pierret
author_sort	Paty Nakhle
title	Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
title_short	Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
title_full	Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
title_fullStr	Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
title_full_unstemmed	Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
title_sort	effects of hydrological regime and land use on in-stream escherichia coli concentration in the mekong basin, lao pdr
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bcc8721562294313b125c8e53c463268
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Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR

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