| Autor: |
Vaz, Cleiton1 cleitonvaz@yahoo.com, Kleine, Tamila1, Sá Tortelli, Talini1, Storch Böhm, Renata Falck1, Spitzner, Elaine C.1, Goncalves, Renata A.1, Barros, Virgínia G.1, Simm, Mariele1, Novais de Oliveira, Therezinha M.1, Matias, William G.2 |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. 2013, Vol. 22 Issue 7b, p1967-1976. 10p. |
| Abstrakt: |
The toxicity resulting from diffuse sources of pollution was assessed using a chronic toxicity test based on the reproduction, body size and survival of Mysidopsis juniae in Babitonga Bay, an estuarine complex that hosts one of the largest areas of mangroves in the southern hemisphere and that receives effluent from six adjacent municipalities, altering the chemical composition of water and interfering with the balance of the ecosystem. Water samples were collected at three points in the Bay: P1: mouth of the Cachoeira river, an interior point; P2: Port of São Francisco do Sul, in the central Bay and P3: Capri Beach, near the Bay's connection with the Atlantic Ocean. These samples were used for toxicity testing and an analysis of the metals Cd, Pb, Cu, Cr, Ni and Zn. The results indicated that the water samples caused chronic effects in Mysidopsis Jun iae when compared to control water. Statistical analysis revealed significant differences in the size of organisms, number of neonates, total population and time to first brood release. The birth rate can be considered the main factor analyzed because it is directly related to the reproduction of the species. Moreover, the study shows that the metals Cd, Pb, Cr and Zn are strongly correlated with birth rate, suggesting they are primarily responsible for chronic toxicity. However, it is necessary to consider the possibility of additive, synergistic and / or antagonistic effects between various metals or other substances that were not analyzed but were present in the samples. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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