Pesticides in the Pantanal

Dores, Eliana Freire Gaspar de Carvalho

doi:10.1007/698_2015_356

Cited by 5 publications

(7 citation statements)

References 32 publications

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“…Previous studies have detected DDT and its degradation products in Brazilian rivers and streams, but at lower concentrations and detection frequencies than those found in the present study. Use of DDT in agriculture has been prohibited in Brazil since 1985, but use for vector control was reported until 1997 (Dores 2015). In sampling conducted in rivers and streams of the northeastern Pantanal in 1999-2000, Laabs et al (2002 found DDT and DDE in 79% and 36% of sediment samples, with maximum concentrations of 1.5 and 1.4 ng/g dw, respectively.…”

Section: Comparison To Previous Studiesmentioning

confidence: 99%

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

Hunt

Bonetto

Resh

et al. 2016

Science of The Total Environment

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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<20 m.

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Section: Comparison To Previous Studiesmentioning

confidence: 99%

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

Hunt

Bonetto

Resh

et al. 2016

Science of The Total Environment

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“…Moreover, it shows that avulsive processes are commonplace in Pantanal, and changes in land use, particularly in river headwaters in the highlands [44,45], can accelerate the avulsions, making difficult a sustainable use of the Pantanal lowlands.…”

Section: Resultsmentioning

confidence: 98%

Avulsive Rivers in the Hydrology of the Pantanal Wetland

Assine

Macedo

Stevaux

et al. 2015

The Handbook of Environmental Chemistry

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This chapter presents and discusses the avulsive nature of the Pantanal rivers and shows how the ever-changing drainage network influences the surface hydrology and ecology. Besides, the systemic portrait here outlined provides new insights concerning the Pantanal hydrodynamics, in its particularities and as a whole system. A simple model of the avulsion process is illustrated, and several realistic examples of the processes leading to river avulsions are shown and discussed. The north-to-south flood-pulse wave due to the presence of bottlenecks is further described in detail. This systemic approach allows identifying that the fluvial "avulsive and bottleneck" dynamics seasonally affects both local and regional ecohydrological processes. Moreover, it shows that avulsive processes are commonplace in Pantanal, and changes in land use, particularly in river headwaters in the highlands, accelerate the avulsions, making the sustainable use of the Pantanal lowland areas difficult.

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“…1). The topographic condition associated to the crop and livestock occupation, lacking adequate soil management for many years, turned the plateau into an uncontrolled source of sediments carried to riverbeds, accompanied by residual chemicals from fertilizers and pesticides [5], which flow into the floodplains. The abnormal sediment deposition causes widespread siltation such as the one observed in the Taquari River [6].…”

Section: Introductionmentioning

confidence: 99%

Historical Land-Use Changes in São Gabriel do Oeste at the Upper Taquari River Basin

Buller

Bayma-Silva

Zanetti

et al. 2015

The Handbook of Environmental Chemistry

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Agricultural expansion in uplands of the Pantanal in recent decades suppressed a large fraction of native vegetation. In the case of the municipality of São Gabriel do Oeste (SGO), located in the Upper Paraguay River Basin, the processing of historical Landsat imagery indicates from 1984 to 2013 a relative land cover increase in soybean/corn cropland from 25% to 30% and pasture from 17% to 41%, whereas a decrease in native forest from 57% to 28%. These land-use changes produced several outstanding economic indexes as the per capita gross domestic product (GDP), 48% higher than that of Brazil. The total GDP increased by 259% from 1999 to 2011. Besides, SGO Human Development Index (HDI) of 0.729 in 2010 was about 2% higher than the Brazil's HDI average. On the other hand, the agricultural development reflected in alterations of major ecohydrological regulations (carbon and water) at the watershed, notwithstanding the economic concentration. Croplands mostly develop in areas of low vulnerability (55%), while

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Pesticides in the Pantanal

Cited by 5 publications

References 32 publications

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

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

Avulsive Rivers in the Hydrology of the Pantanal Wetland

Historical Land-Use Changes in São Gabriel do Oeste at the Upper Taquari River Basin

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