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Integrated assessment of mangrove sediments in the Camamu Bay (Bahia, Brazil)

2010; Elsevier BV; Volume: 74; Issue: 3 Linguagem: Inglês

10.1016/j.ecoenv.2010.10.038

1090-2414

Joana Fidelis da Paixão, Olívia Maria Cordeiro de Oliveira, José Maria Landim Domínguez, Edna dos Santos Almeida, Gilson Correia de Carvalho, Wagner F. Magalhães,

Environmental Toxicology and Ecotoxicology

Camamu Bay, an Environmentally Protected Area, may be affected by the pressures of tourism and oil exploration in the adjacent continental platform. The current quality of the mangrove sediments was evaluated by porewater bioassays using embryos of Crassostrea rhizophorae and by an analysis of benthic macrofauna and its relationships with organic compounds, trace metals and bioavailability. Porewater toxicity varied from low to moderate in the majority of the samples, and polychaetes dominated the benthos. The Grande Island sampling station (Station 1) presented more sandy sediments, differentiated macrobenthic assemblages and the highest metal concentrations in relation to other stations and guideline values, and it was the only station that indicated a possible bioavailability of metals. The origin of the metals (mainly barium) is most likely associated with the barite ore deposits located in the Grande and Pequena islands. These results may be useful for future assessment of the impact of oil exploration in the coastal region.