Effect of eutrophication on mercury, selenium, and essential fatty acids in Bighead Carp (Hypophthalmichthys nobilis) from reservoirs of eastern China

Razavi, N. Roxanna; Arts, Michael T.; Qu, Mingzhi; Jin, Binsong; Ren, Wenwei; Wang, Yuxiang; Campbell, Linda M.

doi:10.1016/j.scitotenv.2014.08.019

Cited by 36 publications

(16 citation statements)

References 43 publications

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“…Phytoplankton were collected by vertical tows through the water column, using a Wisconsin net (45 μ m nylon mesh; nine tows at one meter); zooplankton were collected with a cone net (202 μ m nylon mesh; three tows at 7–20 m, from one meter above the bottom to the surface, with care taken to avoid collecting sediment). Phytoplankton species composition is given elsewhere and was significantly correlated to TP concentrations (Razavi et al ). The size fraction for zooplankton was selected to allow comparison with previously published results (Chen and Folt ; published data extracted using DigitizeIt 2.0.4, http://www.digitizeit.de).…”

Section: Methodsmentioning

confidence: 99%

Effect of eutrophication on mercury (Hg) dynamics in subtropical reservoirs from a high Hg deposition ecoregion

Razavi

Chen

et al. 2015

Limnol. Oceanogr.

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Eutrophication can have opposite effects on mercury (Hg) bioavailability in aquatic systems, by increasing methylmercury (MeHg) production but reducing Hg biomagnification. Globally, the effect of eutrophication on Hg dynamics remains largely untested at lower latitudes such as eastern China, a productive subtropical ecoregion with Hg emission and deposition rates that are among the highest worldwide. Here, we quantify Hg (both MeHg and total Hg, THg) concentrations, Hg bioaccumulation, and Hg biomagnification rates in reservoir food webs across a gradient of eutrophication indicated by chlorophyll a (Chl a), zooplankton density, and total phosphorus (TP). We also assess the effect of hydrogeomorphic (HGM) features on Hg concentrations in water and biota. Water THg concentrations were strongly correlated with TP and were greater in reservoirs at higher elevations with short water retention times (WRT). Zooplankton and top predator THg concentrations were negatively correlated with Chl a, suggesting algal biodilution; evidence for zooplankton density dilution was also found when subtropical reservoirs were compared at a global scale with temperate lakes. Mercury bioaccumulation and biomagnification factors, respectively, did not correlate with increasing Chl a or zooplankton density suggesting no effect of plankton density on Hg trophic transfer. In subtropical reservoirs, eutrophication is associated with lower Hg concentrations in biota but does not explain Hg biomagnification; HGM features (i.e., elevation, WRT) and land use (i.e., % crop) appear to also influence Hg concentrations and bioaccumulation in reservoir food webs.

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Section: Methodsmentioning

confidence: 99%

Effect of eutrophication on mercury (Hg) dynamics in subtropical reservoirs from a high Hg deposition ecoregion

Razavi

Chen

et al. 2015

Limnol. Oceanogr.

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“…Meanwhile, in a comparative study of Hg accumulation in fish from one eutrophic and one oligotrophic lake, substantially lower Hg concentrations were observed in fish from the more productive study site (Kidd et al, 1999). Furthermore, Hg in fish has also been found to be low in highly productive Chinese reservoirs and lakes (Yan et al, 2010;Wang et al, 2012;Razavi et al, 2014). Given the high trophic status of many of the lakes included in the current study, it is not surprising that such low Hg concentrations are observed in fish from these lakes, however, causal mechanisms for these patterns remain largely undefined.…”

Section: Further Evidence Of Low Hg In Fish From African Lakesmentioning

confidence: 98%

Bioaccumulation and biomagnification of mercury in African lakes: The importance of trophic status

Poste

Muir

Guildford

et al. 2015

Science of The Total Environment

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Despite the global prevalence of both mercury (Hg) contamination and anthropogenic eutrophication, relatively little is known about the behavior of Hg in eutrophic and hypereutrophic systems or the effects of lake trophic status on Hg uptake and trophodynamics. In the current study we explore Hg trophodynamics at 8 tropical East African study sites ranging from mesotrophic to hypereutrophic, in order to assess the influence of lake trophic status on Hg uptake and biomagnification. Comprehensive water, plankton and fish samples were collected for analysis of total mercury (THg) and stable carbon and nitrogen isotopic ratios. We found evidence that uptake of THg into phytoplankton tended to be lower in higher productivity systems. THg concentrations in fish were generally low, and THg trophic magnification factors (TMFs; representing the average increase in contaminant concentrations from one trophic level to the next) ranged from 1.9 to 5.6. Furthermore TMFs were significantly lower in hypereutrophic lakes than in meso- and eutrophic lakes, and were negatively related to chlorophyll a concentrations both across our study lakes, and across African lakes for which literature data were available. These observations suggest that THg concentrations were strongly influenced by trophic status, with year-round high phytoplankton and fish growth rates reducing the potential for high THg in fish in these productive tropical lakes.

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“…Previous studies have demonstrated that eutrophication can affect the circulation of heavy metals in aquatic systems (Rahman and Hasegawa, 2012;Razavi et al, 2014;Webster et al, 2011). Yu and Wang (2004) suggested that dissolved phosphorus could strongly stimulate the intracellular accumulation of Cd and Zn in a freshwater alga (Scenedesmus obliquus).…”

Section: Sqgs Assessmentmentioning

confidence: 99%

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

Liu

Zhang

et al. 2016

CATENA

185

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Effect of eutrophication on mercury, selenium, and essential fatty acids in Bighead Carp (Hypophthalmichthys nobilis) from reservoirs of eastern China

Cited by 36 publications

References 43 publications

Effect of eutrophication on mercury (Hg) dynamics in subtropical reservoirs from a high Hg deposition ecoregion

Effect of eutrophication on mercury (Hg) dynamics in subtropical reservoirs from a high Hg deposition ecoregion

Bioaccumulation and biomagnification of mercury in African lakes: The importance of trophic status

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

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