Toxicity of fipronil to Folsomia candida in contrasting tropical soils and soil moisture contents: effects on the reproduction and growth

This study assessed the influence of three tropical soil types and soil moisture content on the toxicity and risk of the insecticide fipronil to collembolans Folsomia candida . Chronic toxicity tests were performed in a Tropical Artificial Soil (TAS), an Oxisol and an Entisol spiked with increasing...

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Bibliographic Details
Published in:Ecotoxicology (London) 2022, Vol.31 (1), p.64-74
Main Authors: Hennig, Thuanne Braúlio, Alves, Paulo Roger Lopes, Toniolo, Tânia, Bandeira, Felipe Ogliari, dos Santos, William Eduardo, da Costa Cabrera, Liziara, Gilson, Ítalo Kael, Baretta, Dilmar
Format: Article
Language:English
Subjects:
Animals
Arthropods
Chronic toxicity
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Fipronil
Folsomia candida
Growth
Insecticides
Moisture content
Pesticides
Pyrazoles
Reproduction
Reproduction (biology)
Risk
Sandy soils
Soil
Soil moisture
Soil Pollutants - analysis
Soil Pollutants - toxicity
Soil types
Soils
Toxicity
Toxicity testing
Toxicity tests
Tropical climate
Tropical environments
Tropical soils
Water content
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Summary:This study assessed the influence of three tropical soil types and soil moisture content on the toxicity and risk of the insecticide fipronil to collembolans Folsomia candida . Chronic toxicity tests were performed in a Tropical Artificial Soil (TAS), an Oxisol and an Entisol spiked with increasing concentrations of fipronil to assess the effects on the reproduction and growth of the species. The soil moisture contents were kept at 60% (standard condition) and 30 or 45% (water restriction) of their water holding capacity (WHC). The toxicity of fipronil on collembolans reproduction was about three times higher in Entisol compared to TAS or Oxisol. Higher toxicities were also found in the drier TAS (EC 50 30%WHC  = 0.20 vs EC 50 60%WHC  = 0.70 mg kg −1 ) and Oxisol (EC 50 45%WHC  = 0.27 vs EC 50 60%WHC  = 0.54 mg kg −1 ), while in Entisol lower impacts were found in the drier samples (EC 50 30%WHC  = 0.41 vs EC 50 60%WHC  = 0.24 mg kg −1 ). For all tested soils, the size of generated collembolans was reduced by the fipronil concentrations, regardless of soil moisture. However, the drier condition increased the effect on the growth in TAS and Entisol for some concentrations. A significant risk of exposure was found in TAS and Oxisol at drier conditions and, for Entisol, regardless of the soil moisture. The toxic effects and risk of fipronil on collembolans were higher in the natural sandy soil. The soil moisture content increase or decrease the toxicity of the insecticide for collembolans, depending on soil type.
ISSN:0963-9292
1573-3017
DOI:10.1007/s10646-021-02490-7