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Studies were carried out to investigate the contamination of Piracicaba and Mogi-Guaç…


Biology Articles » Hydrobiology » Freshwater Biology » Biomonitoring of Pb and Cd in two impacted watersheds in Southeast Brazil, using the freshwater mussel Anodontites trapesialis (Lamarck, 1819) (Bivalvia : Mycetopodidae) as a biological monitor » Conclusions

Conclusions
- Biomonitoring of Pb and Cd in two impacted watersheds in Southeast Brazil, using the freshwater mussel Anodontites trapesialis (Lamarck, 1819) (Bivalvia : Mycetopodidae) as a biological monitor

Although critical concentrations of Pb were not found, this metal was always in higher concentration in tested animals than in the control group. Therefore, it could be important to further investigation to determine the levels of Pb as well as its origin in both basins, but especially, in the Mogi-Guaçu. Another important finding was that there was no correlation between the degree of anthropogenic impacts and Cd and Pb concentrations. Major impacts were observed in the Piracicaba than in the Mogi-Guaçu basin, but Cd and, particularly, Pb concentrations were higher in animals placed in the Mogi-Guaçu basin, which did not confirm the initial hypotheses. In addition, we observed larger concentrations of Pb in less impacted areas of the Piracicaba and Mogi-Guaçu River basins. This fact suggested that it was not possible to infer about concentrations of these heavy metals based only in a broad evaluation of human impacts. The degree of environmental contamination is only one among several factors that influence metal concentrations in animals. Bioavailability or specific sources may be responsible for higher concentrations in apparently less impacted environments.

 

ACKNOWLEDGEMENTS

This work was supported by research grants from FAPESP, grant 97/01348-6 and 95/5075-9, and by Esso Brasileira de Petróleo. Our gratitude is expressed to many friends of the PiraCena project and to Álvaro Costa for help during the sampling procedures.

 


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