Insecticide concentrations in stream sediments of soy production regions of South America

Concentrations of 17 insecticides were measured in sediments collected from 53 streams in soy production regions of South America (Argentina in 2011-2014, Paraguay and Brazil in 2013) during peak application periods. Although environmental regulations are quite different in each country, commonly us...

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Autores principales: Hunt, Lisa, Bonetto, Carlos Alberto, Resh, Vicent H., Buss, Daniel Forsin, Fanelli, Silvia Laura, Marrochi, María Natalia, Lydy, Michael J.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Insecticides
Pyrethroids
Soybean production
South America
Stream buffers
Aquatic toxicity
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/112917
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-112917
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Insecticides
Pyrethroids
Soybean production
South America
Stream buffers
Aquatic toxicity
spellingShingle Ciencias Naturales
Insecticides
Pyrethroids
Soybean production
South America
Stream buffers
Aquatic toxicity
Hunt, Lisa
Bonetto, Carlos Alberto
Resh, Vicent H.
Buss, Daniel Forsin
Fanelli, Silvia Laura
Marrochi, María Natalia
Lydy, Michael J.
Insecticide concentrations in stream sediments of soy production regions of South America
topic_facet Ciencias Naturales
Insecticides
Pyrethroids
Soybean production
South America
Stream buffers
Aquatic toxicity
description Concentrations of 17 insecticides were measured in sediments collected from 53 streams in soy production regions of South America (Argentina in 2011-2014, Paraguay and Brazil in 2013) during peak application periods. Although environmental regulations are quite different in each country, commonly used insecticides were detected at high frequencies in all regions. Maximum concentrations (and detection frequencies) for each sampling event ranged from: 1.2–7.4 ng/g dw chlorpyrifos (56-100%); 0.9–8.3 ng/g dw cypermethrin (20-100%); 0.42–16.6 ng/g dw lambda-cyhalothrin (60-100%); and 0.49– 2.1 ng/g dw endosulfan (13-100%). Other pyrethroids were detected less frequently. Banned organochlorines were most frequently detected in Brazil. In all countries, cypermethrin and/or lambda-cyhalothrin toxic units (TUs), based on Hyalella azteca LC50 bioassays, were occasionally >0.5 (indicating likely acute toxicity), while TUs for other insecticides were <0.5. All samples with total insecticide TU > 1 were collected from streams with riparian buffer width < 20 m. A multiple regression analysis that included five landscape and habitat predictor variables for the Brazilian streams examined indicated that buffer width was the most important predictor variable in explaining total insecticide TU values. While Brazil and Paraguay require forested stream buffers, there were no such regulations in the Argentine pampas, where buffer widths were smaller. Multiple insecticides were found in almost all stream sediment samples in intensive soy production regions, with pyrethroids most often occurring at acutely toxic concentrations, and the greatest potential for insecticide toxicity occurring in streams with minimum buffer width < 20m.
format Articulo
Preprint
author Hunt, Lisa
Bonetto, Carlos Alberto
Resh, Vicent H.
Buss, Daniel Forsin
Fanelli, Silvia Laura
Marrochi, María Natalia
Lydy, Michael J.
author_facet Hunt, Lisa
Bonetto, Carlos Alberto
Resh, Vicent H.
Buss, Daniel Forsin
Fanelli, Silvia Laura
Marrochi, María Natalia
Lydy, Michael J.
author_sort Hunt, Lisa
title Insecticide concentrations in stream sediments of soy production regions of South America
title_short Insecticide concentrations in stream sediments of soy production regions of South America
title_full Insecticide concentrations in stream sediments of soy production regions of South America
title_fullStr Insecticide concentrations in stream sediments of soy production regions of South America
title_full_unstemmed Insecticide concentrations in stream sediments of soy production regions of South America
title_sort insecticide concentrations in stream sediments of soy production regions of south america
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/112917
work_keys_str_mv AT huntlisa insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT bonettocarlosalberto insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT reshvicenth insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT bussdanielforsin insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT fanellisilvialaura insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT marrochimarianatalia insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
AT lydymichaelj insecticideconcentrationsinstreamsedimentsofsoyproductionregionsofsouthamerica
bdutipo_str Repositorios
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