IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The Mercury and Selenium relationship in Franciscana dolphin (Pontoporia blainvillei) from two different impacted environments of Argentina.
Autor/es:
ROMERO, MA. BELEN; DAS, KRISHNA; POLIZZI, PAULA; RODRIGUEZ, DIEGO; GERPE, MARCELA
Lugar:
Liege
Reunión:
Workshop; Aquatic Mammals from Latin America; 2014
Resumen:
Franciscana dolphin is the most endangered cetacean in the Southwest Atlantic. In Argentine waters, there are two geographical groups, one in the Samborombón Bay area (estuarine stock), with recognized high antropogenic impact, and another in the south of it (marine stock). The aim was to assess hepatic levels of mercury (Hg) and selenium (Se) in P. blainvillei between age classes and in the two groups. There was no difference between groups, suggesting a natural input of Hg through diet (mainly fish). Adults presented higher Hg and Se concentrations than juveniles and calves. Fetus had higher levels of both metals than calves, suggesting mother-fetus transference. There was a high correlation between Hg and Se levels, with an average molar ratio Se:Hg = 5:1. It is evident that the demethylation process in the species increases with the development and the growth of individuals, during ontogeny; and the correlation between both metals would indicate that the hepatic accumulation of Hg P. blainvillei is mainly through the Hg-Se granules.