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O foco deste estudo foi avaliar a resposta da Daphnia magna à exposição sequencial ao Metsulfuron-methyl, um herbicida amplamente utilizado. A metodologia incluiu o isolamento de organismos de um reservatório de água no campus experimental de La Maria, seguido de transferência para um ambiente aquoso controlado. O desenvolvimento da população foi monitorado pela quantificação de novas gerações de juvenis a cada 10 dias, revelando um crescimento exponencial de 65% a 68% aos 40 e 50 dias, respectivamente. A mortalidade na exposição controlada ao Metsulfuron-methyl indicou uma relação direta entre a dose do herbicida e a sobrevivência da D. magna, com concentrações acima de 2000 mg/L por 72 horas resultando em mortalidade de mais de 50%, atingindo um máximo de 72% a 3500 mg/L. A exposição a 2000 mg/L por 10 dias reduziu a taxa de reprodução para 6%, enquanto 15 e 20 dias resultaram em inibição completa. Essas descobertas destacam a sensibilidade da D. magna a altas concentrações de Metsulfuron-methyl e sugerem impactos significativos em seu desenvolvimento, sobrevivência e reprodução. Este estudo contribui para a compreensão dos efeitos desse herbicida em organismos aquáticos, destacando a importância das regulamentações ambientais e das práticas agrícolas sustentáveis.
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