Geochemistry of the Upper Paraná River floodplain: study of the Garças Pond and Patos Pond

Remor, Marcelo Bevilacqua; Sampaio, Sílvio César; Damatto, Sandra R.; Castilhos, Zuleica Carmen; Stevaux, José Cândido; Boas, Márcio Antônio Vilas; Reis, Ralpho Rinaldo dos

doi:10.1007/s10967-015-4021-9

Cited by 15 publications

(5 citation statements)

References 46 publications

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“…The region is situated within a protected reserve with no agricultural areas in the surroundings. Physico-chemical analyses of water did not detect heavy metals or other pollutants in the studied ecosystems [19]. We took four annual samples, once each during summer, spring, autumn and winter (except for years 2001, 2003, 2016, 2017, 2018 and 2019, which were sampled twice annually, in summer and winter owing to funding constraints), of insects, non-native fish and environmental variables.…”

Section: Methodsmentioning

confidence: 99%

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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Insect abundance and diversity are declining worldwide. Although recent research found freshwater insect populations to be increasing in some regions, there is a critical lack of data from tropical and subtropical regions. Here, we examine a 20-year monitoring dataset of freshwater insects from a subtropical floodplain comprising a diverse suite of rivers, shallow lakes, channels and backwaters. We found a pervasive decline in abundance of all major insect orders (Odonata, Ephemeroptera, Trichoptera, Megaloptera, Coleoptera, Hemiptera and Diptera) and families, regardless of their functional role or body size. Similarly, Chironomidae species richness decreased over the same time period. The main drivers of this pervasive insect decline were increased concurrent invasions of non-native insectivorous fish, water transparency and changes to water stoichiometry (i.e. N : P ratios) over time. All these drivers represent human impacts caused by reservoir construction. This work sheds light on the importance of long-term studies for a deeper understanding of human-induced impacts on aquatic insects. We highlight that extended anthropogenic impact monitoring and mitigation actions are pivotal in maintaining freshwater ecosystem integrity.

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Section: Methodsmentioning

confidence: 99%

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

et al. 2021

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“…Calibration curves were prepared using GLY (97% purity, Sigma Aldrich) and AMPA (99% purity, Sigma Aldrich) standards. An uncontaminated matrix sample from 1876, confirmed by Remor et al 100 , was also analysed in triplicate after fortification procedures with standard solutions. Other details of the analytical procedure are shown in Supplementary Table S5 .…”

Section: Methodsmentioning

confidence: 99%

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

Silva

Nicola

DUDAS

et al. 2021

Sci Rep

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With the growing global concern on pesticide management, the relationship between its environmental recalcitrance, food security and human health has never been more relevant. Pesticides residues are known to cause significant environmental contamination. Here, we present a case study on long-term no-tillage farming systems in Brazil, where Glyphosate (GLY) has been applied for more than 35 years. GLY and its main breakdown product, aminomethylphosphonic acid (AMPA) were determined in topsoil (0–10 cm) samples from no-tillage fields and nearby subtropical secondary forests by high-performance liquid chromatography coupled with a fluorescence detector. In addition, the presence of carbamates, organochlorines, organophosphates and triazines were also screened for. GLY and AMPA were present in all soil samples, reaching values higher than those described for soils so far in the literature. A significant decrease for AMPA was observed only between the secondary forest and the farm's middle slope for site B. GLY and AMPA were observed respectively at peak concentrations of 66.38 and 26.03 mg/kg soil. GLY was strongly associated with forest soil properties, while AMPA associated more with no-tillage soil properties. Soil texture was a significant factor contributing to discrimination of the results as clay and sand contents affect GLY and AMPA retention in soils. This was the first study to report DDT and metabolites in consolidated no-tillage soils in Brazil (a pesticide fully banned since 2009). Based on human risk assessment conducted herein and the potential risk of GLY to local soil communities, this study offers a baseline for future studies on potential adverse effects on soil biota, and mechanistic studies.

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“…Calibration curves were prepared using GLY (97% purity, Sigma Aldrich), and AMPA (99% purity, Sigma Aldrich) standards. An uncontaminated matrix sample from 1876, con rmed by Remor et al (2015) 102 , was also analysed in triplicate after forti cation procedures with standard solutions. Other details of the analytical procedure are shown in Supplementary Table S5.…”

Section: Study Areamentioning

confidence: 99%

How Far Can Pesticides Spread? A Case Study on No-Tillage Farming Systems and Surrounding Forest Patches

Silva¹,

Nicola²,

DUDAS³

et al. 2020

Preprint

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With the growing global concern on pesticide management, the relationship between its environmental recalcitrance, food security and human health has never been more relevant. Pesticides residues are known to cause significant environmental contamination. The present study focused on long-term no-tillage farming systems and subtropical forests in Brazil, where Glyphosate (GLY) has been applied for more than 35 years. GLY and the main breakdown product of glyphosate, aminomethylphosphonic acid (AMPA) were determined by high-performance liquid chromatography coupled with a fluorescence detector. In addition, the presence of carbamates, organochlorines, organophosphates and triazines were also detected. GLY and AMPA were omnipresent in soil samples, reaching values higher than those described for soils previously in the literature. GLY and AMPA were observed respectively at peak concentrations of 66.38 and 26.03 mg/kg soil. GLY was strongly associated with forest soil properties, while AMPA associated with no-tillage soil properties. The texture was a significant factor that contributed to the maximum discrimination of the results since clay and sand contents influence GLY and AMPA retention in soils. This was the first study to report DDT and metabolites in consolidated no-tillage soils in Brazil (a pesticide fully banned 2009). Based on human risk assessment and the potential risk of GLY to local soil communities, this study offers a baseline for future studies that will be crucial to understand the toxicity mechanisms on non-target soil biota.

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Geochemistry of the Upper Paraná River floodplain: study of the Garças Pond and Patos Pond

Cited by 15 publications

References 46 publications

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Pervasive decline of subtropical aquatic insects over 20 years driven by water transparency, non-native fish and stoichiometric imbalance

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

How Far Can Pesticides Spread? A Case Study on No-Tillage Farming Systems and Surrounding Forest Patches

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