Acute and chronic toxicity of 2,4-D and fipronil formulations (individually and in mixture) to the Neotropical cladoceran Ceriodaphnia silvestrii

Autor(es)

Silva, Lais C. M. ^{[1, 2]} ; Moreira, Raquel A. ^{[1, 2]} ; Pinto, Thandy J. S. ^{[1, 2]} ; Ogura, Allan P. ^{[1, 2]} ; Yoshii, Maria P. C. ^{[1, 2]} ; Lopes, Lais F. P. ^{[1, 2]} ; Montagner, Cassiana C. ^[3] ; Goulart, Bianca V. ^[3] ; Daam, Michiel A. ^[4] ; Espindola, Evaldo L. G. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, PPG SEA, Sao Carlos Sch Engn, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, NEEA CRHEA SHS, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, Inst Chem, LQA, BR-13083970 Campinas, SP - Brazil

^[4] Univ Nova Lisboa, Fac Sci & Technol, CENSE, Dept Environm Sci & Engn, P-2829516 Caparica - Portugal

• Tipo de documento: Artigo Científico
• Fonte: ECOTOXICOLOGY; v. 29, n. 9, p. 1462-1475, NOV 2020.
• Citações Web of Science: 8

Resumo

Brazil is the largest producer of sugarcane and the world's top pesticide market. Therefore, environmental consequences are of concern. The aim of the present study was to evaluate the acute and chronic toxicity of pesticide formulations largely used in sugarcane crops: the herbicide DMA (R) 806 BR (a.i. 2,4-D) and the insecticide Regent (R) 800 WG (a.i. fipronil), isolated and in mixture, to the Neotropical cladoceranCeriodaphnia silvestrii. Toxicity tests with the individual formulated products indicated 48h-EC(50)values of 169 +/- 18 mg a.i./L for 2,4-D and 3.9 +/- 0.50 mu g a.i./L for fipronil. In the chronic tests, the 8d-EC(50)values for reproduction were 55 mg a.i./L (NOEC/LOEC: 50/60 mg a.i./L) and 1.6 mu g a.i./L (NOEC/LOEC: 0.40/0.80 mu g a.i./L) for 2,4-D and fipronil, respectively. A significant decrease in reproduction ofC. silvestriiin all concentrations tested of fipronil, except at the lowest, was observed. Regarding 2,4-D, the organisms had total inhibition of reproduction in the two highest concentrations. Probably your energy reallocation was focused (trade-off) only on its survival. The acute pesticide mixture toxicity (immobility) revealed a dose level dependent deviation with antagonism at low and synergism at high concentrations. For chronic mixture (reproduction) toxicity, antagonism occurred as a result of the interaction of the pesticides. Based on our results and concentrations measured in Brazilian water bodies, fipronil represents ecological risks for causing direct toxic effects onC. silvestrii. These results are worrisome given that agricultural production is likely to increase in the coming years. (AU)

• Processo FAPESP: 15/18790-3 - Consequências ambientais da conversão pastagem-cana-de-açúcar e intensificação de pastagens
• Beneficiário: Luiz Antonio Martinelli
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 17/24126-4 - Efeitos dos pesticidas fipronil e 2,4-d isoladamente e em mistura, sobre espécies nativas da biota aquática neotropical
• Beneficiário: Raquel Aparecida Moreira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado