Geochemical and ecotoxicological assessment for estuarine surface sediments from Southern Brazil |
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| Institution: | 1. Athabasca River Basin Research Institute and Faculty of Science and Technology, Athabasca University, Athabasca, Alberta T9S 3A3, Canada;2. Bamfield Marine Sciences Centre, Bamfield, British Columbia V0R 1B0, Canada;3. Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada;4. Department of Biology, McMaster University, Hamilton, Ontario L8S 4K1, Canada;5. Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada;1. Departamento de Química, Universidade Federal de Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS, Brazil 97105-900;2. Universidade Federal do Rio Grande (FURG), Instituto de Ciências Biológicas, Rio Grande, RS, Brazil 96201-900;3. Dept. of Biology, McMaster University, 1280 Main Street West, Hamilton, ON, Canada L8S 4K1 |
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| Abstract: | Sediments from Guaratuba Bay (PR, Brazil), a marine protected area, were collected and evaluated for geochemistry and toxicity. High levels of P and acute toxicity were observed in some samples. Concentrations of Cu, Cd, Pb and Zn were relatively low; however, Cd levels eventually exceeded Threshold Effect Level. Toxicities were associated to nutrients and metals enrichment. Results suggest that impacts are incipient and occur only at specific sites, associated to multiple contamination sources. Despite sediments quality seems to range between good and fair, attention is required to land-use planning around Guaratuba Bay and controlling local pollution sources. |
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