Bioaccumulation characteristics of mercury in fish in the Three Gorges Reservoir, China

Xu, Qinqin; Zhao, Lei; Ba, Zhixin; Xie, Qing; Yin, Deliang; Feng, Xinbin; Wang, Dingyong

doi:10.1016/j.envpol.2018.08.048

Cited by 48 publications

(19 citation statements)

References 65 publications

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“…Furthermore, 45 % of individuals exceeded the marketing limits, although no statistically higher Hg concentrations were observed in N. nandus. Compared to the present study, lower Hg in fishes was reported by Wang et al (2019) in an artificial Changshou Lake and Xu et al (2018) in Three Gorges Reservoirs in China.…”

Section: Resultscontrasting

confidence: 95%

“…Sometimes, fish species from different trophic levels may have similar mercury concentrations due to unknown reasons. Furthermore, low Hg concentrations in predator fishes of reservoirs could be due to the short food webs and limited magnification factor compared to natural water bodies (Xu et al, 2018). Although overall average concentrations of total Hg in fishes from the present study had significantly lower values (t = -3.87, p < 0.001) compared to the international marketing limit (500 mg/kg; WHO, 2008), X.…”

Section: Resultscontrasting

confidence: 59%

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Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal

Acharya¹,

Sharma

Kang

et al. 2019

Nep Jnl Environ Sci

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Stable isotope ratios of nitrogen (δ15N, ‰) and carbon (δ13C, ‰), accompanied by stomach contents were used to assess the food chain and trophic transfer of mercury in fifty-three marketable sized fish belonging to five species (Channa punctatus, Mystus vittatus, Nandus nandus, Puntius sophore and Xenentodon cancila) from the Jagadishpur Reservoir, Nepal. The highest total Hg concentration was found in X. cancila with an average of 800.42(±279.36) µg/kg exceeding the international marketing limit (500 mg/kg), a carnivorous species. However, except for some individuals of N. nandus, total Hg concentrations in other fish species in the present study were significantly lower than that limit. The fish community had at least two trophic levels (Δ15N > 5.6), C. punctatus with the highest and M. vittatus the lowest signatures of δ15N, which was also supported by the stomach content analysis. There was neither correlation between total Hg and δ15N nor connectivity in food resource utilization (based on δ13C), indicating no biomagnification among these fish species. In addition, Hg concentrations were not significantly correlated to total fish length in any of the species. Fish species in the present study have low Hg content accompanied by low biomagnification through the studied fish community.

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Section: Resultscontrasting

confidence: 95%

Section: Resultscontrasting

confidence: 59%

Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal

Acharya¹,

Sharma

Kang

et al. 2019

Nep Jnl Environ Sci

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“…The control group was raised in medium containing ethanol (0.1%), VCH group in 1 mmol VCH/L of fly food, MeHg + group in 0.2 mmol MeHg + /L of fly food and VCH + MeHg + group in 1 mmol VCH/L + 0.2 mmol MeHg + /L of fly food. Because of the strong affinity of MeHg + for thiol groups [34, 37] it is expected that the MeHg + will react to the thiol-containing proteins of the diet, mainly the yeast proteins (data are not shown), forming an R-S-HgMe complex (R = protein), which mimics the intake of this compound by vertebrates [64–68]. In fact, the MeHg + in fish muscle is found almost exclusively bound to cysteinyl residues of proteins [66].…”

Section: Methodsmentioning

confidence: 99%

Simultaneous exposure to vinylcyclohexene and methylmercury in Drosophila melanogaster: biochemical and molecular analyses

Piccoli

Segatto

Oliveira

et al. 2019

BMC Pharmacol Toxicol

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BackgroundExposure to vinylcyclohexene (VCH) and methylmercury (MeHg+) can induce oxidative stress and gene modulation. Several studies have been evaluating the effects of VCH and MeHg+, but little is known about interactive effects between them. This work aimed to assess the exposure and co-exposure effects of MeHg+ and VCH on oxidative stress and gene modulation in Drosophila melanogaster.MethodsReactive species production, glutathione S-transferase (GST) and acetylcholinesterase (AChE) activities were evaluated after exposure and co-exposure to VCH (1 mM) and MeHg+ (0.2 mM) for one or three days in the head and body (thorax and abdomen) of flies. The expression of genes related to redox state and inflammatory response was evaluated after exposure and co-exposure to VCH and MeHg+ for three days.ResultsSurvival decreased only in flies co-exposed to VCH and MeHg+ for three days. All treatments increased total reactive species production after one day of exposure. However, no significant changes were observed in the head after three days of exposure. One day of exposure to VCH caused an increase in the head GST activity, whereas MeHg+ induced an increase after three days of exposure. Regarding the body, all treatments increased GST activity after one day of exposure, but only the flies exposed to MeHg+ presented an increase in GST activity after three days of exposure. Treatments did not alter AChE activity in the head. As for gene expression, there was a significant increase in the Relish transcription factor gene in the flies’ body, but Nrf2, Keap1, Jafrac1, TrxR1, and NF-κβ were not altered.ConclusionThe results suggest that exposure to VCH and MeHg+ induce oxidative stress and activation of an inflammatory response in fruit flies.

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“…Hg bioaccumulation in farmed fish was reported (Q. Xu et al, 2018). The MeHg distribution in sediment remains unknown; this baseline data is essential for long monitoring of bioavailable Hg in the TGR.…”

Section: Introductionmentioning

confidence: 99%

Mercury and its form in a dammed reservoir ecosystem during the charging phase

Mir

et al. 2020

Environ Sci Pollut Res

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Throughout continents, reservoirs tend to have elevated methylmercury (MeHg) concentration transformed from mercury (Hg/ total Hg). This impact may be pronounced in the reservoir with less velocity of water during the charging period resulted in the deposition of sediments. In sediments on favorable conditions, methylation may be enhanced by the decomposition of flood organic material, which can release Hg and enhance microbial activity. However, much less is known about the transfer ratio of Hg and its form MeHg from sediment to biota in the hydrological reservoir during the dam charging phase. The objective of our study was to understand the interrelationship between total Hg and MeHg in two key components sediment and fish in the reservoir ecosystem. This study was performed at the Three Gorges Reservoir (TGR) located on upstream of the Yangtze River in China. At the TGR charging phase, during winter time, the water level was high due to blockade of water by Three Gorges Dam (TGD). Sediment and fish samples were collected in winter season for total Hg, MeHg, and several ancillary parameters. The results showed that total Hg in sediment samples of the winter season were ranged from 6.2 ± 0.001 to 193.3 ± 0.001 × 10 −3 mg/kg, with an average value of 53.76 ± 51.80 × 10 −3 mg/kg, and for MeHg was ranged from 12.1 ± 0.04 to 348.7 ± 0.16 × 10 −2 ng/g, with an average value of 98.96 ± 93.07 × 10 −2 ng/g. Total Hg and MeHg in fish samples of the winter season were from 42.48 ± 6.71 to 166 ± 52.56 ng/g, with an average value of 76.22 ± 31.23 ng/g, and from 21.09 ± 2.31 to 61.60 ± 13.30 ng/g, with an average value of 37.89 ± 11.96 ng/g. The relationship of total Hg and MeHg concentrations in fish to those of sediments from corresponding sites showed a negative relationship. This might include a strong association of total Hg with an inorganic component of sediment (e.g., bound to sulfides or coprecipitated with other metal oxides such as manganese and iron). The average concentration of fish MeHg found in this study, at rates greater than 1.72 g/day, was estimated hazardous to human health. This study concludes sediment was acting as sequestrate for total Hg and MeHg in TGR. The bioaccumulation of total Hg and MeHg in fish was not controlled by sediment further investigation about pathological routes and dietary habits of fish needed to be identified for total Hg and MeHg study in TGR.

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Bioaccumulation characteristics of mercury in fish in the Three Gorges Reservoir, China

Cited by 48 publications

References 65 publications

Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal

Bioaccumulation of mercury in fishes of Jagadishpur Reservoir, Nepal

Simultaneous exposure to vinylcyclohexene and methylmercury in Drosophila melanogaster: biochemical and molecular analyses

Mercury and its form in a dammed reservoir ecosystem during the charging phase

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