Alterações histopatológicas utilizadas em girinos de Lithobates catesbeianus como biomarcadores de intoxicações causadas por pesticidas
DOI:
https://doi.org/10.20950/1678-2305/bip.2022.48.e711Palavras-chave:
Amphibian, Biomarker, Ecotoxicology, Lithobates catesbeianusResumo
O uso de indicadores biológicos tem aumentado nos últimos anos, com o intuito de investigar a poluição ambiental em ambientes aquáticos que são vulneráveis ao constante uso de pesticidas. Alguns biomarcadores podem ajudar a avaliar o estado de saúde, indicando alterações físicas, metabólicas e comportamentais de intoxicações agudas e subletais. A mistura dos ingredientes ativos picoxistrobina e ciproconazol é amplamente usada como fungicida para o controle de pragas da cultura de algodão, arroz, café, cana-de-açúcar, milho, soja e trigo. O objetivo deste trabalho foi verificar a ocorrência de possíveis lesões histopatológicas em fígado e rins de girinos de rã-touro (Lithobates catesbeianus) causadas pela mistura dos fungicidas picoxistrobina e ciproconazol. Os animais foram submetidos a diferentes concentrações do fungicida para determinação da concentração letal mediana (CL50-96h = 0,05 mg L-1), ou seja, a dose letal para 50% dos animais em 96 horas. Após a determinação do valor da CL50-96h, os animais foram submetidos a três concentrações subletais (CL50-96h/2, CL50-96h/10 e CL50-96h/100). Através dos biomarcadores histológicos, a pesquisa verificou que esse fungicida alterou a morfologia dos tecidos renais e hepáticos dos animais de maneira crônica, prejudicando o funcionamento de órgãos que são fundamentais para sua sobrevivência e metamorfose, o que pode resultar em um desequilíbrio para a biodiversidade dos ecossistemas aquáticos.
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