Concentrations of metals in liver of Guiana dolphins (Sotalia guianensis) from an estuary in Southeast of Brazil


  • Lilian Dalago Salgado Universidade Federal do Paraná
  • Suzana Mas Rosa Faculdade de Ensino Superior e Formação Integral
  • Júlio César Rodrigues de Azevedo Universidade Tecnológica Federal do Paraná



Concentrations of Fe, Zn, Cu, Mn, Pb, Cr, Co and Ni were measured in the liver of 21 Guiana dolphins from the Estuarine-Lagoon Complex of Iguape-Cananéia, in order to indicate the impact of their habitat and to verify if these concentrations differ between the sexes and age classes. The concentrations followed the order: Fe>Zn>Cu>Mn>Pb>Cr>Co>Ni, and with the exception of lead, all concentrations were in the same order of magnitude observed for the species. The accumulations between the sexes were similar, while copper were higher in infants, suggesting that the organ can act as a reservoir for Co in a period of rapidly postnatal growth. Lead mean concentration (3.17 μg g-1) were the highest described for the species, which from a toxicological point of view may be a matter of concern. This accumulation suggests a trophic transfer, indicating the contamination of the food chain, which possibly reflects the local environmental contamination caused by ancient lead mining.

Author Biographies

Lilian Dalago Salgado, Universidade Federal do Paraná

Laboratório de Toxicologia Ambiental, Departamento de Farmacologia

Suzana Mas Rosa, Faculdade de Ensino Superior e Formação Integral

Departamento de Medicina Veterinária

Júlio César Rodrigues de Azevedo, Universidade Tecnológica Federal do Paraná

Laboratório de Estudos Avançados em Química Ambiental, Departamento de Química






Original Articles