Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources

Tropical communities in the developing world depend heavily on riverine systems for their socioeconomic development. However, these resources are poorly protected from diffuse pollution, and there is a lack of quantitative information regarding the microbial pollution characteristics of riverine wat...

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Autores principales:	Douglas Mushi, Geda Kebede, Rita B. Linke, Aschalew Lakew, Daniel S. Hayes, Wolfram Graf, Andreas H. Farnleitner
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	catchment landscape diffuse pollution source faecal indicator bacteria faecal taxation riverine water soil Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/716669ebc30a4fc08dbd615d9cbd6b8d
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spelling	oai:doaj.org-article:716669ebc30a4fc08dbd615d9cbd6b8d2021-11-06T06:28:20ZMicrobial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources1477-89201996-782910.2166/wh.2021.269https://doaj.org/article/716669ebc30a4fc08dbd615d9cbd6b8d2021-08-01T00:00:00Zhttp://jwh.iwaponline.com/content/19/4/575https://doaj.org/toc/1477-8920https://doaj.org/toc/1996-7829Tropical communities in the developing world depend heavily on riverine systems for their socioeconomic development. However, these resources are poorly protected from diffuse pollution, and there is a lack of quantitative information regarding the microbial pollution characteristics of riverine water, despite frequently reported gastrointestinal diseases. The aim of our study was to apply faecal taxation (i.e., faecal pellet counting in representative test areas to estimate the potential availability of diffuse pollution sources) in combination with a detailed microbiological faecal pollution analysis in a riverine environment to elucidate the importance of diffuse pollution. To realize this approach, ambient faecal pellets, a multiparametric data set for standard faecal indicator bacteria (SFIB), including Escherichia coli, Clostridium perfringens spores and enterococci from catchment soil and river water, and a number of riverine water physicochemical variables were analysed during a one-year cycle. We demonstrated that the abundance of ambient faecal pellets, which were consistently counted at reference sites in the catchment, was associated with faecal pollution in the river water. Water SFIB, dissolved oxygen, nutrients, conductivity and total suspended solids were strongly linked with the abundance of ambient faecal pellets in the river catchment, as demonstrated by principal component analysis (PCA). Elevated concentrations of SFIB in the riverine water in the absence of rainfall also suggested the direct input of faecal bacteria into the riverine water by livestock (e.g., during watering) and humans (e.g., during bathing). Statistical analyses further revealed that the microbiological water quality of the investigated riverine water was not influenced by SFIB potentially occurring in the soil. This study demonstrates the importance of diffuse faecal pollution sources as major drivers of the microbiological quality of riverine water in the Ethiopian highlands. In addition, the new successfully applied integrated approach could be very useful for developing predictive models, which would aid in forecasting riverine microbiological quality in tropical developing countries. HIGHLIGHTS Faecal taxation could reveal diffuse drivers of standard faecal indicator bacteria (SFIB) in riverine water.; Data from rainfall, soil and water SFIB and faecal pellet counts were integrated.; Rainfall-induced runoff introduced catchment faecal pellets to the river water.; SFIB densities in the riverine water strongly correlated with faecal pellet counts.; Faecal pellets and rainfall-induced runoff were the dominant drivers of SFIB in the riverine water.;Douglas MushiGeda KebedeRita B. LinkeAschalew LakewDaniel S. HayesWolfram GrafAndreas H. FarnleitnerIWA Publishingarticlecatchment landscapediffuse pollution sourcefaecal indicator bacteriafaecal taxationriverine watersoilPublic aspects of medicineRA1-1270ENJournal of Water and Health, Vol 19, Iss 4, Pp 575-591 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	catchment landscape diffuse pollution source faecal indicator bacteria faecal taxation riverine water soil Public aspects of medicine RA1-1270
spellingShingle	catchment landscape diffuse pollution source faecal indicator bacteria faecal taxation riverine water soil Public aspects of medicine RA1-1270 Douglas Mushi Geda Kebede Rita B. Linke Aschalew Lakew Daniel S. Hayes Wolfram Graf Andreas H. Farnleitner Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
description	Tropical communities in the developing world depend heavily on riverine systems for their socioeconomic development. However, these resources are poorly protected from diffuse pollution, and there is a lack of quantitative information regarding the microbial pollution characteristics of riverine water, despite frequently reported gastrointestinal diseases. The aim of our study was to apply faecal taxation (i.e., faecal pellet counting in representative test areas to estimate the potential availability of diffuse pollution sources) in combination with a detailed microbiological faecal pollution analysis in a riverine environment to elucidate the importance of diffuse pollution. To realize this approach, ambient faecal pellets, a multiparametric data set for standard faecal indicator bacteria (SFIB), including Escherichia coli, Clostridium perfringens spores and enterococci from catchment soil and river water, and a number of riverine water physicochemical variables were analysed during a one-year cycle. We demonstrated that the abundance of ambient faecal pellets, which were consistently counted at reference sites in the catchment, was associated with faecal pollution in the river water. Water SFIB, dissolved oxygen, nutrients, conductivity and total suspended solids were strongly linked with the abundance of ambient faecal pellets in the river catchment, as demonstrated by principal component analysis (PCA). Elevated concentrations of SFIB in the riverine water in the absence of rainfall also suggested the direct input of faecal bacteria into the riverine water by livestock (e.g., during watering) and humans (e.g., during bathing). Statistical analyses further revealed that the microbiological water quality of the investigated riverine water was not influenced by SFIB potentially occurring in the soil. This study demonstrates the importance of diffuse faecal pollution sources as major drivers of the microbiological quality of riverine water in the Ethiopian highlands. In addition, the new successfully applied integrated approach could be very useful for developing predictive models, which would aid in forecasting riverine microbiological quality in tropical developing countries. HIGHLIGHTS Faecal taxation could reveal diffuse drivers of standard faecal indicator bacteria (SFIB) in riverine water.; Data from rainfall, soil and water SFIB and faecal pellet counts were integrated.; Rainfall-induced runoff introduced catchment faecal pellets to the river water.; SFIB densities in the riverine water strongly correlated with faecal pellet counts.; Faecal pellets and rainfall-induced runoff were the dominant drivers of SFIB in the riverine water.;
format	article
author	Douglas Mushi Geda Kebede Rita B. Linke Aschalew Lakew Daniel S. Hayes Wolfram Graf Andreas H. Farnleitner
author_facet	Douglas Mushi Geda Kebede Rita B. Linke Aschalew Lakew Daniel S. Hayes Wolfram Graf Andreas H. Farnleitner
author_sort	Douglas Mushi
title	Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
title_short	Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
title_full	Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
title_fullStr	Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
title_full_unstemmed	Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources
title_sort	microbial faecal pollution of river water in a watershed of tropical ethiopian highlands is driven by diffuse pollution sources
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/716669ebc30a4fc08dbd615d9cbd6b8d
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Microbial faecal pollution of river water in a watershed of tropical Ethiopian highlands is driven by diffuse pollution sources

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