An overview of mercury contamination research in the Amazon basin with an emphasis on Brazil

Hacon, Sandra; Barrocas, Paulo Rubens Guimarães; Vasconcellos, Ana Cláudia Santiago de; Barcellos, Christovam; Wasserman, Julio César; Campos, Reinaldo Calixto de; Ribeiro, C Maria Cunha; Azevedo-Carloni, Flávia B.

doi:10.1590/s0102-311x2008000700003

Cited by 42 publications

(31 citation statements)

References 57 publications

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“…In these different studies, fish consumption was often cited as the most significant factor for the bioaccumulation of mercury, particularly in its organic form. The results of this study corroborated with the results obtained in several recent studies between total Hg and MeHg concentrations in hair samples and eating habits Marques et al 2007;Hacon et al 2008;.…”

Section: Discussionsupporting

confidence: 91%

“…A large number of exposure assessments of fish-eating populations have been conducted in many parts of the huge Amazon region, using blood and/or hair as biomarkers to study communities environmentally exposed through their fish diet (Campos 2001;Dorea 2003;Dorea et al 2005;Santos et al 2007;Hacon et al 2008;. Fish has always been an important item in the diet for Amazonians and per se is their best source of essential nutrients.…”

Section: Introductionmentioning

confidence: 99%

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Mercury and methylmercury concentration assessment in children's hair from Manaus, Amazonas state, Brazil

et al. 2012

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The present study evaluated Hg and MeHg content in hair samples of 201 children 2 to 7 years old, living in six neighborhoods of the city of Manaus, Amazonas State, Brazil. In general, the total Hg and MeHg median ranges in hair were similar (0.91 to 1.71 mg kg -1 ) except for the São Jose neighborhood, which was lower (0.16 mg kg -1 ). De spite the fact that the Manaus population consumes fish as part of the normal dietary intake, the Hg hair levels were below the level for an adult population not exposed to mercury (2.0 mg kg -1 ). These data were compared to demographic, socioeconomic information and eating habits of the families that took part in the study. The results were also compared to other published data from the Amazon region, other regions of Brazil and other countries. Future studies to set Hg and MeHg levels in hair of children in Brazil should take into account and assess the diversity of the country, mainly in terms of eating habits, socio-economic and cultural aspects. Keywords: mercury, methylmercury, children's hair, Amazon region. ). Esses dados foram comparados com informações demográficas, socioeconômicas e hábitos alimentares das famílias que participaram do estudo. Os resultados também foram comparados com outros dados publicados da Amazônia, outras regiões do Brasil e outros países. Futuros estudos para definir os níveis de Hg total e MeHg no cabelo das crianças brasileiras deverão considerar e avaliar a diversidade do país, principalmente em termos de hábitos alimentares, nível sócio-econômico e os aspectos culturais. Avaliação da concentração de Mercúrio e Metilmercúrio em cabelo de crianças de Manaus, Estado do Amazonas, Brasil

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Mercury and methylmercury concentration assessment in children's hair from Manaus, Amazonas state, Brazil

et al. 2012

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“…), with a consequent release of mercury into the air, aquatic and terrestrial ecosystems. These activities can increase local mercury levels several thousand-fold above background (1,9,17). In aquatic environments, mercury can be naturally converted to its most toxic species, methylmercury a potent neurotoxin, which is bioaccumulated and biomagnified through the trophic chain (2,9).…”

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confidence: 99%

A conservative region of the mercuric reductase gene (merA) as a molecular marker of bacterial mercury resistance

Sotero-Martins¹,

Jesus²,

Lacerda³

et al. 2008

Braz. J. Microbiol.

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“…The dangers that face this species are poaching for consumption, the capture of live animals for exhibition or kept as pets as well as the degradation and pollution of their habitat [8,16,17]. The importance of conserving this species is its ecological role as biological control of aquatic plants, contributing to fertilization water and plankton production, and so be a kind of high ecological value [3].…”

Section: Introductionmentioning

confidence: 99%

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

Mendoza¹,

Loja²,

Lizana³

et al. 2017

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The objective of the study was to determine a prediction equation of body weight of Amazonian manatee calves in captivity using their biometry. It was conducted out with 7 calves (4 males and 3 females) of approximately 8 months of age and average body weight of 29.94 ± 0.055 kg, arranged in pools of sufficient size. Biometry and weighing were performed periodically, with the following measurements: body weight (BW), total curved length (TCL), total length (TL), circumference (CIR), fin width (FW), tail width (TW) and peduncle (PED). Data were subjected to Pearson correlation analysis and linear regression, using the statistical software IBM SPSS 24.0. The results showed a significant correlation (P < 0.05) between BW and TCL, TL, FW, TW, CIR and PED. Six linear simple regression equations were generated with relation to BW, using as predictor variables those that showed positive correlation. The CIR equation independent variable had the highest correlation coefficient and less error estimate (R 2 = 0.855, 2 aj R = 0.852). In addition, three linear multiple regression equations of BW were calculated using the predictor variables previously analyzed by Person correlation analysis. The equation that used all biometric measurements (TCL, TL, FW, TW, CIR and PED) had the highest coefficient of determination and the lowest estimation error to predict BW. In conclusion, the biometric measurements of TCL, TL, FW, TW, CIR and PED showed a high correlation with the BW and can be used as predictive variables of BW of manatee calves, as they are easy to be measured.

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An overview of mercury contamination research in the Amazon basin with an emphasis on Brazil

Abstract: This article provides an overview of research on mercury contamination in the Amazon

Cited by 42 publications

References 57 publications

Mercury and methylmercury concentration assessment in children's hair from Manaus, Amazonas state, Brazil

Mercury and methylmercury concentration assessment in children's hair from Manaus, Amazonas state, Brazil

A conservative region of the mercuric reductase gene (merA) as a molecular marker of bacterial mercury resistance

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

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