Cyanotoxins and water quality parameters as risk assessment indicators for aquatic life in reservoirs

Autor(es)

Passos, Larissa Souza ; de Almeida, Eryka Costa ; Villela, Alexandre ; Fernandes, Adilson Nunes ; Marinho, Marcelo Manzi ; Gomes, Levy Carvalho ; Pinto, Ernani

• Tipo de documento: Artigo Científico
• Fonte: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY; v. 241, p. 10-pg., 2022-07-04.

Resumo

We assessed the extent of pollution in an essential public water supply reservoir (southeastern Brazil). An environmental monitoring study was performed at the Billings Reservoir (at the water catchment site) to assess the water quality in 2017, 2018, and 2019. Physicochemical parameters were analyzed, quantifying the total cyanobacteria and the cyanotoxins microcystins (MCs) and saxitoxins (SXTs), as well as their possible ecological risk to the aquatic environment. We also determined metals and metalloids (As, Ba, Cd, Pb, Cu, Cr, Fe, Mn, Ni, Zn, and Sb) and fecal bacteria (Escherichia coli). Monthly samplings were performed for 2017, 2018, and 2019 (totaling 36 sampling campaigns). Metals, metalloids, and E. coli values were below the maximum limit allowed by the Brazilian legislation. High concentrations of total cyanobacteria (3.07 x 10(4) - 3.23 x 10(5) cells/mL), microcystin variants MC-LR (0.67-23.63 mu g/L), MC-LA (0.03-8.66 mu g/L), MC-RR (0.56-7.92 mu g/L), and MC-YR (0.04-1.24 mu g/L), as well as the saxitoxins GTX2 (0.18-5.37 mu g/L), GTX3 (0.13-4.40 mu g/L), and STX (0.12-2.92 mu g/L) were detected. From an ecotoxicological point of view, the estimated values for the risk quotient (RQ) for microcystins and saxitoxins were largely greater than 1, indicating a high risk to aquatic life. Therefore, further efforts need to be made to delay the eutrophication of the reservoir. (AU)

• Processo FAPESP: 13/07914-8 - FoRC - Centro de Pesquisa em Alimentos
• Beneficiário: Bernadette Dora Gombossy de Melo Franco
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 21/14239-1 - Efeitos da interação entre organofosforados sintéticos e natural em Oreochromis niloticus (Teleostei: Cichlidae)
• Beneficiário: Larissa Souza Passos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 21/00149-0 - Tratamento e fracionamento seletivo de cianobactérias em florações para produção de insumos de valor agregado
• Beneficiário: Ernani Pinto Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/00109-6 - Avaliação da toxicidade de cianopeptídeos em peixes para consumo humano provenientes de pisciculturas em tanques-rede
• Beneficiário: Larissa Souza Passos
• Modalidade de apoio: Bolsas no Brasil - Mestrado