Post-Impoundment Evolution of Fish Mercury Levels at the La Grande Complex, Québec, Canada (from 1978 to 1996)

Schetagne, Roger; Verdon, Richard

doi:10.1007/978-3-642-60160-6_12

Cited by 25 publications

(37 citation statements)

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“…Select water chemistry and hydrological parameters are presented in Table 1. Although newly flooded landscapes are well known for the production and release of methylmercury (MeHg) (Gerrard and St. Louis, 2001), the five major reservoirs were created >90 years ago and the impact of MeHg production from the original flooding is no longer a factor (Schetagne and Verdon, 1999). The current hydrological management varies for each reservoir.…”

Section: Study Areamentioning

confidence: 99%

Relating Land Cover Characteristics and Common Loon Mercury Levels Using Geographic Information Systems

et al. 2005

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This effort models the relationship between mercury (Hg) levels in the common loon (Gavia immer) and land cover types as defined by the National Land Cover Database (NLCD). We constructed the model within the framework of a GIS to analyze the spatial relationships between land cover types and blood Hg levels in male common loons. Thiessan polygons were used to generate the territory for each loon. We created 150, 300, and 600-m buffers around the Thiessan polygons and modeled the relationships that existed in each distance class. Within the 150-m buffer, three cover types, crop land, shrub land, and wetland were significantly related to blood Hg levels (r2 = 0.552, p < 0.001), which may indicate that the proximity of these cover types influences Hg availability in loon territories. Cropland exhibited a negative relationship with blood Hg levels and may play a role in reducing the amount of available Hg within the study area while wetlands and shrub lands exhibit a positive relationship. The study area consisted of five major lakes and eleven smaller ponds in northwest Maine, and data included a total of 61 male common loon blood Hg samples.

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Section: Study Areamentioning

confidence: 99%

Relating Land Cover Characteristics and Common Loon Mercury Levels Using Geographic Information Systems

et al. 2005

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“…The redox (Eh) transition zone containing sulfate-reducing bacteria (SRB) has long been recognized as favoring microbial Hg methylation (e.g., Jensen and Jernelov, 1969;Gilmour et al, 1992;King et al, 1999;Benoit et al, 2003). Similar situations fostering MMHg formation have also been found in artificial lakes and a number of authors have even pointed out that filling hydroelectric reservoirs may result in increasing the Hg concentrations found in fish (e.g., Surma Aho et al, 1986;Verdon et al, 1991;Tremblay, 1996;Schetagne and Verdon, 1999). The methylating potential of equatorial or tropical lakes has been poorly explored to date and only a few studies on Hg speciation have focused on such areas (e.g., Guimares et al, 2000 a and b;Roulet et al, 2000 and2001;Coelho-Souza et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

Monomethylmercury sources in a tropical artificial reservoir

Muresan¹,

Cossa²,

Richard³

et al. 2008

Applied Geochemistry

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The distribution and speciation of mercury (Hg) in the water column, the inputs (wet deposition and tributaries) and the outputs (atmospheric evasion and outlet) of an artificial partially anoxic tropical lake (Petit-Saut reservoir, French Guiana) were investigated on a seasonal basis in order to appraise the cycling and transformations of this metal. The total mercury (HgT) concentrations in the oxygenated epilimnetic waters averaged 5 ± 3 pmol L −1 in the unfiltered samples (HgTUNF) and 4 ± 2 pmol L −1 in the dissolved (HgTD) phase (<0.45 μm). On average, the monomethylmercury (MMHg) constituted 8%, 40% and 18% of the HgT in the dissolved phase, the particulate suspended matter and in the unfiltered samples, respectively. Covariant elevated concentrations of particulate MMHg and chlorophyll a in the epilimnion suggest that phytoplankton is an active component for the MMHg transfer in the lake. In the anoxic hypolimnion the HgTUNF averages 13 ± 6 pmol L −1 and the HgTD 8 ± 4 pmol L −1. The averages of MMHgP and MMHgD in hypolimnetic waters were two and three times the corresponding values of the epilimnion, 170 ± 90 pmol g −1 and 0.9 ± 0.5 pmol L −1 , respectively. In the long dry and wet seasons, at the flooded forest and upstream dam sampling stations, the vertical profiles of MMHgD concentrations accounted for two distinct maxima: one just below the oxycline and the other near the benthic interface. Direct wet atmospheric deposition accounted for 14 moles yr −1 HgTUNF, with 0.7 moles yr −1 as MMHgUNF, while circa 76 moles yr −1 of HgTUNF, with 4.7 moles yr −1 as MMHgUNF, coming from tributaries. Circa 78 moles (not, vert, similar17% as MMHg) are annually exported through the dam, while 23 moles yr −1 of Hg0 evolve in the atmosphere. A mass balance calculation suggests that the endogenic production of MMHgUNF attained 8.1 moles yr −1 , corresponding to a methylation rate of 0.06% d −1. As a result, the Petit-Saut reservoir is a large manmade reactor that has extensively altered mercury speciation in favor of methylated species.

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“…The risk of deleterious effects on human health may exist in those that have a greater consumption of B. falcatus because the consumer will be exposed to higher loads of mercury (including the sensitive groups). With the implementation of the Sinop Hydroelectric Power Plant, which it is planned to operates from 2019, future studies on fish assessment should be carried out since the creation of the reservoir may increase the bioaccumulation of Hg in fish, as already seen in many tropical and temperate reservoirs (e.g., Schetagne, Verdon, 1999;Hylander et al, 2006;Porvari, 1995).…”

Section: Discussionmentioning

confidence: 99%

Assessment of mercury contamination in Brycon falcatus (Characiformes: Bryconidae) and human health risk by consumption of this fish from the Teles Pires River, Southern Amazonia

et al. 2018

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Brycon falcatus is one of the most highly consumed species of fish within the region in the Teles Pires basin, and has great commercial importance in sport and professional artisanal fishing. The objective of this study was to analyze the presence and concentration of total mercury (THg) in the muscle, liver and gills of B. falcatus, and calculate the risk to human health of THg contamination from ingestion of the fish. THg concentrations were similar in the liver (0.076 mg kg-1) and muscle (0.052 mg kg-1), and higher than in the gills (0.009 mg kg-1). The levels of HgT present in B. falcatus tissues did not influence weight gain and nutritional status. Based on the condition factor, weight and length ratio and hepatosomatic index, it seems that the concentrations of THg did not influence the health and well-being of B. falcatus collected in the Teles Pires River basin. THg concentrations in the muscle of B. falcatus are below the limit recommended by the World Health Organization for people who consume until 250 g of fish per week. The risk of deleterious effects on human health may exist if there is a greater consumption of B. falcatus such as 340 g/day, that is the mean of fish consumption by indigenous and riverine.

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Post-Impoundment Evolution of Fish Mercury Levels at the La Grande Complex, Québec, Canada (from 1978 to 1996)

Cited by 25 publications

References 0 publications

Relating Land Cover Characteristics and Common Loon Mercury Levels Using Geographic Information Systems

Relating Land Cover Characteristics and Common Loon Mercury Levels Using Geographic Information Systems

Monomethylmercury sources in a tropical artificial reservoir

Assessment of mercury contamination in Brycon falcatus (Characiformes: Bryconidae) and human health risk by consumption of this fish from the Teles Pires River, Southern Amazonia

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