Use este identificador para citar ou linkar para este item:
https://repositorio.inpa.gov.br/handle/1/18891
Título: | Concentration and subcellular distribution of trace elements in liver of small cetaceans incidentally caught along the Brazilian coast |
Autor: | Kunito, Takashi Nakamura, Shinji Ikemoto, Tokutaka Anan, Yasumi Kubota, Reiji Tanabe, Shinsuke Weber Rosas, Fernando Cesar Fillmann, Gilberto Readman, James W. |
Palavras-chave: | Biodiversity Biological Organs Coastal Zones Concentration (process) Estuaries Methane Silver Demethylation Dolphins Livers Mitochondria Trace Elements Antimony Arsenic Barium Cadmium Cesium Chromium Cobalt Copper Gallium Iron Lead Manganese Mercury Methyl Mercury Molybdenum Rubidium Selenium Silver Strontium Thallium Trace Element Vanadium Zinc Biological Uptake Cetacean Heavy Metal Marine Mammal Marine Pollution Pollution Exposure Trace Element Animals Experiment Animals Tissue Cellular Distribution Cetacea Concentration (parameters) Controlled Study Dolphin Estuary Liver Methylation Nonhuman Seashore Suckling Animal Cetacea Environmental Monitoring Female Liver Male Tissue Distribution Trace Elements Atlantic Ocean Brazilian Shelf Cetacea Coryphaenidae Delphinus Delphinus Capensis Delphinus Delphis Mammalia Pontoporia Blainvillei Sotalia Stenella (cetacea) Stenella Coeruleoalba Stenella Frontalis |
Data do documento: | 2004 |
Revista: | Marine Pollution Bulletin |
É parte de: | Volume 49, Número 7-8, Pags. 574-587 |
Abstract: | Concentrations of trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, Ga, As, Se, Rb, Sr, Mo, Ag, Cd, Sb, Cs, Ba, T-Hg, Org-Hg, Tl and Pb) were determined in liver samples of estuarine dolphin (Sotalia guianensis; n=20), Franciscana dolphin (Pontoporia blainvillei; n=23), Atlantic spotted dolphin (Stenella frontalis; n=2), common dolphin (Delphinus capensis; n=1) and striped dolphin (Stenella coeruleoalba; n=1) incidentally caught along the coast of São Paulo State and Paraná State, Brazil, from 1997 to 1999. The hepatic concentrations of trace elements in the Brazilian cetaceans were comparable to the data available in literature on marine mammals from Northern Hemisphere. Concentrations of V, Se, Mo, Cd, T-Hg and Org-Hg increased with increasing age in liver of both estuarine and Franciscana dolphins. Very high concentrations of Cu (range, 262-1970 μg/g dry wt.) and Zn (range, 242-369 μg/g dry wt.) were observed in liver of sucklings of estuarine dolphin. Hepatic concentrations of V, Se, T-Hg, Org-Hg and Pb were significantly higher in estuarine dolphin, whereas Franciscana dolphin showed higher concentrations of Mn, Co, As and Rb. Ratio of Org-Hg to T-Hg in liver was significantly higher in Franciscana dolphin than estuarine dolphin, suggesting that demethylation ability of methyl Hg might be lower in liver of Franciscana than estuarine dolphins. High hepatic concentrations of Ag were found in some specimens of Franciscana dolphin (maximum, 20 μg/g dry wt.), and 17% of Franciscana showed higher concentrations of Ag than Hg. These samples with high Ag concentration also exhibited elevated hepatic Se concentration, implying that Ag might be detoxified by Se in the liver. Higher correlation coefficient between (Hg+0.5 Ag) and Se than between Hg and Se and the large distribution of Ag in non-soluble fraction in nuclear and mitochondrial fraction of the liver also suggests that Ag might be detoxified by Se via formation of Ag2Se in the liver of Franciscana dolphin. © 2004 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.marpolbul.2004.03.009 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Não existem arquivos associados a este item.
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.