Export of mercury downstream from reservoirs

Schetagne, Roger

doi:10.1016/s0048-9697(00)00557-x

Cited by 57 publications

(57 citation statements)

References 14 publications

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“…The results here also indicated that, like other reported habitats, particulate mercury accounted for about half of the total mercury observed (Schetagne et al 2000, Gray et al 2000. In the SRS streams the average percentage for total mercury was 55% versus 50% in the Savannah River.…”

Section: Discussionsupporting

confidence: 86%

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Final Report on the Aquatic Mercury Assessment Study

Halverson¹

2008

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Section: Discussionsupporting

confidence: 86%

“…A possible source for these pulses was L Lake. Reservoirs are known to export significant amounts of mercury, especially when water is released from an anoxic hypolimnion (Schetagne et al 2000;Canavan et al 2000), as may have been occurring in April of 2001 when high levels of mercury were measured in Steel Creek.…”

Section: Discussionmentioning

confidence: 99%

Final Report on the Aquatic Mercury Assessment Study

Halverson¹

2008

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“…Because of widespread placer mining of gold in the Inambari River [10,23], there is large potential for extensive bacterial methylation of Hg within organic-rich sediments of the newly created reservoir. It is well documented that reservoir construction causes MeHg concentrations in fish tissue to rise [45][46][47]. Fishes inhabiting a reservoir on the Inambari River would be expected to have elevated MeHg concentrations.…”

Section: Discussionmentioning

confidence: 99%

Gold Mining and Mercury Bioaccumulation in a Floodplain Lake and Main Channel of the Tambopata River, Perú

Roach¹,

Jacobsen²,

Fiorello³

et al. 2013

JEP

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Contamination of water bodies by inorganic mercury (Hg [II]) used in placer mining of gold deposits in the Madre de Dios Department, Perú, contributes to the bioaccumulation of methylmercury (MeHg) in fish tissue. We measured MeHg and total Hg (THg) concentrations (mg/kg wet weight [ww] tissue) of thirteen fish species from the Tambopata River, Perú, and the connected oxbow lake Tres Chimbadas. We also used stable isotope analysis (δ 15 N and δ 13 C) to estimate trophic positions of fishes. Average MeHg concentrations of fish species ranged from 0.042 mg/kg ww (Satanoperca jurupari) to 0.463 mg/kg ww (Hoplias malabaricus) in the main channel and from 0.090 mg/kg ww (Parauchenipterus sp.) to 1.282 mg/kg ww (Pimelodina flavipinnis) in the lake. Spearman rank correlation indicated that trophic position had no influence on MeHg concentrations of species in the main channel, but in the lake, trophic positions of species were positively associated with MeHg. Migrations of the pimelodid catfish surveyed from the main channel are well documented. Because little gold mining occurs at our study site, fishes from the main channel may be bioaccumulating MeHg from areas where mining is widespread. Fish species that reside in the lake are relatively sedentary and migration is limited by the brief period of floodplain inundation and the long, narrow corridor that connects the lake to the main channel; lake sediments are therefore the likely source for MeHg bioaccumulation. Five out of the eight fish species surveyed from the main channel and two out of the five species from the lake had MeHg levels higher than United States Environmental Protection Agency fish tissue criterion for human consumption.

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“…Bargagli et al, 1998;McIntyre & Beauchamp, 2007). According to Schetagne et al (2000), feeding is the main pathway of methylmercury to fish. Methylmercury concentrations in fish can be up to 100 000 times higher than the water concentration (World Health Organization, 1990).…”

Section: Introductionmentioning

confidence: 99%

Mercury distribution in different tissues and trophic levels of fish from a tropical reservoir, Brazil

et al. 2009

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Concentrations of organic (OrgHg) and inorganic mercury (InorgHg) were assessed in different fish tissues (liver, muscle, kidney, gut and gonads) and trophic levels collected in an impacted tropical reservoir in southeastern Brazil. Organic mercury concentrations in muscle were remarkably higher in the carnivorous species Hoplias malabaricus and Oligosarcus hepsetus. The ratios of OrgHg in relation to total mercury (%OrgHg) in muscle also varied according to the species trophic level: 93% for carnivores, 84% for omnivores, 73% for algivores/planktivores and 58% for detritivores. The %OrgHg in the gut tissue of carnivores (78%) was much higher than that found in omnivores (30%), possibly reflecting a process of trophic biomagnification in the reservoir. On the other hand, the InorgHg concentrations in muscle decreased with the trophic level increase, suggesting that this form of mercury did not biomagnify through the food web. Gonads contained the least total mercury, and approximately all of this mercury was represented by the organic form (83 to 98%). The kidney and the liver of all fish species contained less than 50% OrgHg. We suggest that the low %OrgHg in the liver is related to different capacities or strategies of OrgHg detoxification by the fish.Concentrações de mercúrio orgânico (OrgHg) e inorgânico (InorgHg) foram avaliadas em diferentes tecidos e níveis tróficos de peixes (fígado, músculo, rim, trato digestivo e gônadas) coletados em um reservatório tropical impactado, no sudeste do Brasil. Concentrações de OrgHg no músculo foram notavelmente maiores em carnívoros (Hoplias malabaricus e Oligosarcus hepsetus).As porcentagens de OrgHg em relação ao mercúrio total (%OrgHg) no músculo também variaram de acordo com o nível trófico das espécies: 93% para os carnívoros, 84% para os onívoros, 73% para os algívoros/planctívoros e 58% para os peixes detritívoros. Além disso, a %OrgHg encontrada no trato digestivo dos peixes carnívoros (78%) foi substancialmente superior a encontrada nos onívoros (30%), possivelmente refletindo um processo de biomagnificação trófica no reservatório. Por outro lado, as concentrações de InorgHg no músculo diminuíram com o aumento do nível trófico, sugerindo que esta forma do mercúrio não biomagnificou ao longo da cadeia alimentar. As gônadas apresentaram as menores concentrações de mercúrio total e grande parte deste estava na forma orgânica (83 a 98%). Por outro lado, rins e fígado de todas as espécies de peixes apresentaram menos que 50% de OrgHg. Sugere-se que a baixa %OrgHg no fígado possa estar relacionada às diferentes capacidades ou estratégias de destoxificação do OrgHg nesses peixes.

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Export of mercury downstream from reservoirs

Cited by 57 publications

References 14 publications

Final Report on the Aquatic Mercury Assessment Study

Final Report on the Aquatic Mercury Assessment Study

Gold Mining and Mercury Bioaccumulation in a Floodplain Lake and Main Channel of the Tambopata River, Perú

Mercury distribution in different tissues and trophic levels of fish from a tropical reservoir, Brazil

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Export of mercury downstream from reservoirs

Cited by 57 publications

References 14 publications

Final Report on the Aquatic Mercury Assessment Study

Final Report on the Aquatic Mercury Assessment Study

Gold Mining and Mercury Bioaccumulation in a Floodplain Lake and Main Channel of the Tambopata River, Per&#250;

Mercury distribution in different tissues and trophic levels of fish from a tropical reservoir, Brazil

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Gold Mining and Mercury Bioaccumulation in a Floodplain Lake and Main Channel of the Tambopata River, Perú