Toxicity of imidacloprid to collembolans in two tropical soils under different soil moisture.

Autor: Braúlio Hennig T; Dep. of Soil Science, Santa Catarina State Univ., Ave. Luis de Camões, 2090, Lages, SC, 88520-000, Brazil.; Federal Univ. of Fronteira Sul, Ave. Fernando Machado 108 E, Chapecó, SC, 89802112, Brazil., Ogliari Bandeira F; Dep. of Soil Science, Santa Catarina State Univ., Ave. Luis de Camões, 2090, Lages, SC, 88520-000, Brazil., Dalpasquale AJ; Federal Univ. of Fronteira Sul, Ave. Fernando Machado 108 E, Chapecó, SC, 89802112, Brazil., Cardoso EJBN; Dep. of Soil Science, Univ. of São Paulo, Ave. Pádua Dias, 11, Piracicaba, SP, 13416-900, Brazil., Baretta D; Dep. of Soil Science, Santa Catarina State Univ., Ave. Luis de Camões, 2090, Lages, SC, 88520-000, Brazil.; Centro de Educação Superior do Oeste, Santa Catarina State Univ., Beloni Trombeta Zanin, 680-E, Chapecó, SC, 89815-630, Brazil., Lopes Alves PR; Federal Univ. of Fronteira Sul, Ave. Fernando Machado 108 E, Chapecó, SC, 89802112, Brazil.
Jazyk: angličtina
Zdroj: Journal of environmental quality [J Environ Qual] 2020 Nov; Vol. 49 (6), pp. 1491-1501. Date of Electronic Publication: 2020 Sep 17.
DOI: 10.1002/jeq2.20143
Abstrakt: Shifts in precipitation regimes due to the predicted climate changes can alter the water content in tropical soils and, consequently, may influence the toxicity of pesticides to soil fauna. This study assessed the influence of soil moisture content on the toxicity of the insecticide imidacloprid to the collembolans Folsomia candida in two tropical soils and evaluated the risk of this active ingredient for this species in the soils tested through the toxicity exposure ratio approach. Acute and chronic toxicity tests with F. candida were performed using an Entisol and an Oxisol. The soils were spiked with increasing imidacloprid concentrations while simulating normal water availability (60% of the water holding capacity [WHC]) and water restriction (30 or 45% WHC) for the tests. In the Oxisol, the reduction of soil moisture content significantly increased the toxic effects of imidacloprid on F. candida's survival (LC 50 at 45% WHC = 23.8 vs. LC 50 at 60% WHC >64 mg kg -1 ) and reproduction (effective concentration causing reductions in species reproduction of 50% [EC 50 ] at 45% WHC = 0.32 vs. EC 50 at 60% WHC = 2.83 mg kg -1 ), but in the Entisol no clear influence of the soil moisture on the toxicity of imidacloprid for collembolans was found. A significant risk for F. candida was observed in the Oxisol only when in water restriction, whereas in the Entisol it occurred regardless of soil moisture, suggesting that the imidacloprid hazard and risk for F. candida may be increased if soil moisture decreases due to climate changes, depending on the soil type.
(© 2020 The Authors. Journal of Environmental Quality © 2020 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.)
Databáze: MEDLINE
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