Publications des scientifiques de l'IRD

Nakhle P., Ribolzi Olivier, Boithias L., Rattanavong S., Auda Y., Sayavong S., Zimmermann R., Soulileuth B., Pando Anne, Thammahacksa C., Rochelle-Newall Emma, Santini W., Martinez Jean-Michel, Gratiot Nicolas, Pierret Alain. (2021). Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR. Scientific Reports - Nature, 11, 3460 [17 p.]. ISSN 2045-2322.

Titre du document
Effects of hydrological regime and land use on in-stream Escherichia coli concentration in the Mekong basin, Lao PDR
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000684765700015
Auteurs
Nakhle P., Ribolzi Olivier, Boithias L., Rattanavong S., Auda Y., Sayavong S., Zimmermann R., Soulileuth B., Pando Anne, Thammahacksa C., Rochelle-Newall Emma, Santini W., Martinez Jean-Michel, Gratiot Nicolas, Pierret Alain
Source
Scientific Reports - Nature, 2021, 11, 3460 [17 p.] ISSN 2045-2322
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.
Plan de classement
Pollution [038] ; Santé : généralités [050] ; Hydrologie [062] ; Biotechnologies [084]
Localisation
Fonds IRD [F B010091990]
Identifiant IRD
fdi:010081990
Contact