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A description of mercury in fishes from the Madeira River Basin, Amazon, Brazil Acta Amazonica
Bastos,Wanderley Rodrigues; Rebelo,Mauro de Freitas; Fonseca,Márlon de Freitas; Almeida,Ronaldo de; Malm,Olaf.
Over the last 20 years several projects carried on the Madeira River basin in the Amazon produced a great amount data on total Hg concentration in different fish species. In this paper we discuss temporal trends in Hg contamination and its relation to body weight in some of those fishes, showing that even within similar groups, such as carnivorous and non-migratory fish, the interspecies variability in Hg accumulation is considerable.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish; Mercury; Biomagnification; Madeira River; Amazon.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000300006
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Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon Acta Amazonica
Almeida,Ronaldo de; Bernardi,José Vicente Elias; Oliveira,Ronaldo Cavalcante; Carvalho,Dario Pires de; Manzatto,Angelo Gilberto; Lacerda,Luiz Drude de; Bastos,Wanderley Rodrigues.
The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic matter; Indicator kriging; Madeira river; Seasonality.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100010
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