Assessment of the causes of Hg bioaccumulation in the fish of a Mediterranean lagoon subject to environmental management interventions
| Autor: | Paola Gennaro, Mauro Lenzi, Letizia Marsili, A. D'Agostino, E. Franchi, M. Leporatti-Persiano |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Mediterranean climate Conservation of Natural Resources Geologic Sediments chemistry.chemical_element 010501 environmental sciences Aquatic Science Oceanography 01 natural sciences Water column Sedimentary organic matter Animals Humans Fish contamination 0105 earth and related environmental sciences 010604 marine biology & hydrobiology Sediment Lagoon Mercury Contamination Eutrophication DGT Pollution Bioaccumulation Mercury (element) Heavy metal chemistry Environmental chemistry Environmental science Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Marine pollution bulletin. 162 |
| ISSN: | 1879-3363 |
| Popis: | In a Mediterranean lagoon characterized by high levels of Hg in the sediment, Hg content in commercial fish species was determined, and, in order to establish Hg concentration in the water column, Diffusive Gradient in Thin films technique (DGT) was used. The results allowed to state (1) the disturbance of the surface sediment and its resuspension in the water column did not cause detectable increase in Hg releases, (2) the East basin acted more than the West one in contamination of fish species, (3) the small-sized sea-breams (400 g) were more contaminated than larger sizes ones (400 g). We concluded: (1) fish contamination may also depend on direct contact with releases of the contaminant and small, gregarious and less sedentary subjects are more likely to incur releases of Hg; (2) Hg releases can be greater in areas with a relatively low sedimentary organic matter load compared to areas subjected to high density macroalgal mat, regardless of the amount of Hg present in the sediments; (3) wind transport of plant masses in low energy storage areas, may constitute an increase factor of Hg in the sediment. A critical review of the results was made in comparison with the available literature reports and some hypotheses were proposed regarding the possible dynamics and availability of the contaminant. |
| Databáze: | OpenAIRE |
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