MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Mercury, Selenium, Silver and other trace elements in Commerson?s dolphins (Cephalorhynchus c. commersonii) from Tierra del Fuego, Argentina
Autor/es:
CÁCERES SAEZ, I.; DELLABIANCA, N.; GOODALL, R.N.P.; CAPPOZZO, L.; RIBEIRO GUEVARA, S.
Reunión:
Congreso; XV CONGRESO LATINOAMERICANO DE CIENCIAS DEL MAR; 2013
Resumen:
A survey of elemental contents of Fe, Zn, Mn, Co, Cd, Au, As, Ag and THg in liver, kidney, lung and spleen, and muscle tissue was performed in nine bycaught specimens of Commerson?s dolphins from the subantarctic waters of Tierra del Fuego, Argentina. The concentrations were determined by Instrumental Neutron Activation Analysis on freeze dried samples. Among essential trace metals, the lung and liver had the highest concentrations of Fe, 1130(138,2) and 974(180) μgg−1 dry weight (DW) (average and standard deviation in parenthesis), respectively. Liver and kidney showed similar Zn concentrations ranging between 100 and 137 μgg−1 DW; whereas Mn was higher in the hepatic tissue 15,5(3,0) μgg−1 DW. Among pollutants, Cd reached the mean highest concentration in renal tissue, 35(24) μgg−1 DW and THg the mean highest concentration in hepatic tissue, 15,3(15,2) μgg−1 DW. Kidney and muscle showed similar values, ranging from 2,58 to 3,63 μgg−1 DW. Mercury concentrations in lung and spleen were 1,01(0,71) and 0,64(0,39) μgg−1 DW; respectively. Selenium concentrations were similar in hepatic, renal, lung and spleen tissues, with mean values from 11,1 to 18,20 μgg−1 DW; and the lowest concentration was observed in the muscle, 3,92(1,84) μgg−1 DW. Highest concentration of Ag were found in the liver 5,4(5,0) μgg-1 DW and kidney 1,2(2,7) μgg-1 DW. Gold and As showed no significant differences among tissues. The molar ratios of Se/Hg, expressing Se availability to form Hg stable compounds such as HgSe, were 7,3(8,8); 13,2(9,5) and 6,7(9,2) in the hepatic, renal, and muscle tissues respectively, suggesting Se protection against Hg toxicity. High Se/Hg ratios were observed in lung 80,1(111,9) and spleen 60,1(65,7). This study constitutes the first description of the elemental composition with metabolic inferences, and first the joint description of Se, Hg and Ag concentrations in soft tissues of Commerson?s dolphins from subantarctic waters of the southern South Atlantic Ocean.