| Texto completo | |
| Autor(es): |
Alexandre, David Silva
;
da Costa, Vanessa Borges
;
Gomes, Diego Ferreira
;
Dias, Mariana Amaral
;
Montagner, Cassiana Carolina
;
Espindola, Evaldo Luiz Gaeta
;
Pinto, Thandy Junio da Silva
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | AQUATIC TOXICOLOGY; v. 289, p. 10-pg., 2025-10-18. |
| Resumo | |
Pesticides are extensively used in agriculture worldwide, often reaching freshwater ecosystems and posing risks to non-target aquatic organisms. However, standard ecotoxicological assessments are commonly based on temperate species, potentially underestimating the vulnerability of tropical fauna. This study aimed to evaluate the acute toxicity of the insecticide imidacloprid (IMI) and the fungicide tebuconazole (TEB), individually and in mixture, to seven tropical freshwater invertebrate species: the crustaceans Ceriodaphnia silvestrii, Hyalella meinerti, and Strandesia rondoniensis, the insect Chironomus sancticaroli, and the oligochaetes Allonais inaequalis and Allonais chelata. Assays were conducted under controlled laboratory conditions using five concentrations per compound. Mixture experiments were carried out with the most sensitive species from each biological group (S. rondoniensis, C. sancticaroli, and A. inaequalis). Organism sensitivity was compared with that of temperate organisms using Species sensitivity distributions (SSDs) curves. Risk characterization was performed based on environmental concentrations reported in Brazilian surface waters. IMI was considerably more toxic than TEB to all species, except for C. silvestrii, which exhibited higher tolerance to both compounds. SSD distributions showed that temperate species are more sensitive to both pesticides. Mixture exposure induced synergistic interaction primarily at low concentrations of IMI in C. sancticaroli and S. rondoniensis. Synergism was observed at environmentally relevant concentrations, while antagonism occurred at higher doses of IMI. These findings underscore the ecological risks posed by pesticide mixtures in freshwater ecosystems and emphasize the importance of risk assessment frameworks that consider native biodiversity. (AU) | |
| Processo FAPESP: | 24/11107-5 - Microplásticos e seus efeitos na degradação do pesticida atrazina |
| Beneficiário: | Mariana Amaral Dias |
| Modalidade de apoio: | Bolsas no Brasil - Programa Fixação de Jovens Doutores |
| Processo FAPESP: | 22/12104-4 - Destino e impactos de microplásticos e pesticidas em matrizes aquáticas e terrestres em contextos agrícolas |
| Beneficiário: | Cassiana Carolina Montagner |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 22/14293-9 - Destino, interação e efeitos ecológicos de microplásticos e agrotóxicos em ambientes de água doce tropicais |
| Beneficiário: | Thandy Júnio da Silva Pinto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 24/08039-8 - Efeitos ecotoxicológicos de microplásticos e agrotóxicos, isolados e em mistura, sobre a espécie nativa Chironomus sancticaroli (Díptera) em ecossistemas aquáticos dulcícolas |
| Beneficiário: | Diego Ferreira Gomes |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 24/00791-2 - Efeitos ecotoxicológicos do microplástico polietileno e do agrotóxico imidacloprido, isolados e em mistura, sobre os invertebrados aquáticos Daphnia similis (Cladocera) e Hyalella meinerti (Amphipoda) |
| Beneficiário: | David Silva Alexandre |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 24/02189-8 - Microplásticos e seus efeitos na degradação do pesticida atrazina |
| Beneficiário: | Cassiana Carolina Montagner |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |