1. Effect of land use and hydrological processes on Escherichia coli concentrations in streams of tropical, humid headwater catchments
- Author
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Laurie Boithias, Bounsamay Soulileuth, Norbert Silvera, Olivier Ribolzi, Pem Sisouvanh, Nikom Hmaimum, Keooudone Latsachack, Henri Robain, Hai Tran Sy, Rinh Pham Dinh, Marion Viguier, Jean-Louis Janeau, Piyapong Naporn, Christian Valentin, Emma Rochelle-Newall, Chanthamousone Thammahacksa, Alain Pierret, Institut d'écologie et des sciences de l'environnement de Paris (iEES), Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement, Partenaires INRAE, Soils & Fertilizers Res Inst, Duc Thang Ward, Hanoi, Vietnam, Natl Pk Wildlife & Plant Conservat Dept NPD, 61 Phaholyotin Rd, Bangkok 10900, Thailand, National Park, Wild Life and Plant Conservation Department (DNP), National Park Wild Life and Plant Conservation Department, National University of Laos, French ANR 'Teciteasy' [ANR-13-AGRO-0007], French Institut de Recherche pour le Developpement (IRD) through the ECOFILTER project (LMI LUSES), UMR iEES-Paris, UMR GET, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), and Rochelle-Newall, Emma
- Subjects
Rain ,[SDV]Life Sciences [q-bio] ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Feces ,contamination ,afforestation ,Vegetation type ,Dry season ,Multidisciplinary ,Ecology ,Agriculture ,stormwater runoff ,health ,Vegetation ,Thailand ,field ,6. Clean water ,Catchment hydrology ,Vietnam ,Laos ,[SDE]Environmental Sciences ,Seasons ,Water Microbiology ,Environmental Monitoring ,Wet season ,fecal indicator bacteria ,STREAMS ,Article ,Hydrology (agriculture) ,Water Supply ,Escherichia coli ,Animals ,Humans ,Developing Countries ,soils ,0105 earth and related environmental sciences ,northern vietnam ,Hydrology ,Tropical Climate ,rivers ,waters ,Humidity ,15. Life on land ,Bacterial Load ,020801 environmental engineering ,13. Climate action ,Environmental science ,Surface runoff - Abstract
Lack of access to clean water and adequate sanitation continues to be a major brake on development. Here we present the results of a 12-month investigation into the dynamics of Escherichia coli, a commonly used indicator of faecal contamination in water supplies, in three small, rural catchments in Laos, Thailand and Vietnam. We show that land use and hydrology are major controlling factors of E. coli concentrations in streamwater and that the relative importance of these two factors varies between the dry and wet seasons. In all three catchments, the highest concentrations were observed during the wet season when storm events and overland flow were highest. However, smaller peaks of E. coli concentration were also observed during the dry season. These latter correspond to periods of intense farming activities and small, episodic rain events. Furthermore, vegetation type, through land use and soil surface crusting, combined with mammalian presence play an important role in determining E. coli loads in the streams. Finally, sampling during stormflow revealed the importance of having appropriate sampling protocols if information on maximum contamination levels is required as grab sampling at a fixed time step may miss important peaks in E. coli numbers.
- Published
- 2016
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