Avaliação dos efeitos da acidificação em sedimentos: mobilidade de contaminantes e biodisponibilidade em mexilhões (Mytella charruana)

• Ano de defesa: 2017
• Autor(a) principal: Brito, Bruna Alves de [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Ocean acidification; Bivalve; Carbon capture and storage; Ecotoxicology; Metals; Acidificação oceânica; Captura e armazenamento de carbono; Ecotoxicologia; Metais
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5534126; https://repositorio.unifesp.br/handle/11600/50017

In marine ecosystems, sediments act as a sink for contaminants, such as metals. However, acidification processes caused by accidental CO2 leakage associated with Carbon Capture and Storage activities may cause the remobilization and bioavailability of metals from sediments to the water column, resulting in toxic effects on marine biota. Considering the urgent need to understand the environmental risks of this activity, this study aimed to investigate the effects of acidification on marine sediments using Mytella charruana mussel. Therefore, ecotoxicological assays were performed over 14 days using sediment matrices from a reference and a contaminated site at four pH treatments (7.6, 7.0, 6.5, 6.0) and the seawater pH control (8.1). Lethal and sublethal effects were evaluated through behavioral, cytotoxicity, histopathology and bioaccumulation analysis. After 14 days, mortality and sublethal responses of behavior, cytotoxicity and histopathology evidenced deleterious effects of acidification, especially at the lower pH (6.5 and 6.0), which showed an intensification of synergistic effects with contamination. Bioaccumulation did not present a linear relation with the pH reduction. The most sensitive sublethal response was histopathology, since effects were observed in all acidification scenarios. Based on the responses analyzed, it was possible to note an impact associated with ocean acidification, especially as a result of CO2 leakage from CCS activity.