Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.

Synthetic pyrethroid insecticides have generated public concerns due to their increasing use and potential effects on aquatic ecosystems. A modeling system was developed in this study for simulating the transport processes and associated sediment toxicity of pyrethroids at coupled field/watershed sc...

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Autores principales:	Yuzhou Luo, Minghua Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d53b2aa32314d75838dbc8df63d23ee
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spelling	oai:doaj.org-article:1d53b2aa32314d75838dbc8df63d23ee2021-11-18T07:00:47ZEnvironmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.1932-620310.1371/journal.pone.0015794https://doaj.org/article/1d53b2aa32314d75838dbc8df63d23ee2011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21246035/?tool=EBIhttps://doaj.org/toc/1932-6203Synthetic pyrethroid insecticides have generated public concerns due to their increasing use and potential effects on aquatic ecosystems. A modeling system was developed in this study for simulating the transport processes and associated sediment toxicity of pyrethroids at coupled field/watershed scales. The model was tested in the Orestimba Creek watershed, an agriculturally intensive area in California' Central Valley. Model predictions were satisfactory when compared with measured suspended solid concentration (R(2) = 0.536), pyrethroid toxic unit (0.576), and cumulative mortality of Hyalella azteca (0.570). The results indicated that sediment toxicity in the study area was strongly related to the concentration of pyrethroids in bed sediment. Bifenthrin was identified as the dominant contributor to the sediment toxicity in recent years, accounting for 50-85% of predicted toxicity units. In addition, more than 90% of the variation on the annual maximum toxic unit of pyrethroids was attributed to precipitation and prior application of bifenthrin in the late irrigation season. As one of the first studies simulating the dynamics and spatial variability of pyrethroids in fields and instreams, the modeling results provided useful information on new policies to be considered with respect to pyrethroid regulation. This study suggested two potential measures to efficiently reduce sediment toxicity by pyrethroids in the study area: [1] limiting bifenthrin use immediately before rainfall season; and [2] implementing conservation practices to retain soil on cropland.Yuzhou LuoMinghua ZhangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 1, p e15794 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yuzhou Luo Minghua Zhang Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
description	Synthetic pyrethroid insecticides have generated public concerns due to their increasing use and potential effects on aquatic ecosystems. A modeling system was developed in this study for simulating the transport processes and associated sediment toxicity of pyrethroids at coupled field/watershed scales. The model was tested in the Orestimba Creek watershed, an agriculturally intensive area in California' Central Valley. Model predictions were satisfactory when compared with measured suspended solid concentration (R(2) = 0.536), pyrethroid toxic unit (0.576), and cumulative mortality of Hyalella azteca (0.570). The results indicated that sediment toxicity in the study area was strongly related to the concentration of pyrethroids in bed sediment. Bifenthrin was identified as the dominant contributor to the sediment toxicity in recent years, accounting for 50-85% of predicted toxicity units. In addition, more than 90% of the variation on the annual maximum toxic unit of pyrethroids was attributed to precipitation and prior application of bifenthrin in the late irrigation season. As one of the first studies simulating the dynamics and spatial variability of pyrethroids in fields and instreams, the modeling results provided useful information on new policies to be considered with respect to pyrethroid regulation. This study suggested two potential measures to efficiently reduce sediment toxicity by pyrethroids in the study area: [1] limiting bifenthrin use immediately before rainfall season; and [2] implementing conservation practices to retain soil on cropland.
format	article
author	Yuzhou Luo Minghua Zhang
author_facet	Yuzhou Luo Minghua Zhang
author_sort	Yuzhou Luo
title	Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
title_short	Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
title_full	Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
title_fullStr	Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
title_full_unstemmed	Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
title_sort	environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/1d53b2aa32314d75838dbc8df63d23ee
work_keys_str_mv	AT yuzhouluo environmentalmodelingandexposureassessmentofsedimentassociatedpyrethroidsinanagriculturalwatershed AT minghuazhang environmentalmodelingandexposureassessmentofsedimentassociatedpyrethroidsinanagriculturalwatershed
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Environmental modeling and exposure assessment of sediment-associated pyrethroids in an agricultural watershed.

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