Effect of eutrophication on mercury, selenium, and essential fatty acids in Bighead Carp (Hypophthalmichthys nobilis) from reservoirs of eastern China
| Autor: | Linda M. Campbell, N. Roxanna Razavi, Wenwei Ren, Binsong Jin, Michael T. Arts, Mingzhi Qu, Yuxiang Wang |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
Carps Environmental Engineering 010501 environmental sciences 01 natural sciences Selenium chemistry.chemical_compound Animals Environmental Chemistry 14. Life underwater Food science Waste Management and Disposal Methylmercury 0105 earth and related environmental sciences chemistry.chemical_classification Hypophthalmichthys Fatty Acids Essential biology 010604 marine biology & hydrobiology Mercury Eutrophication biology.organism_classification Pollution Bighead carp Eicosapentaenoic acid chemistry 13. Climate action Docosahexaenoic acid Environmental chemistry Asian carp Water Pollutants Chemical Environmental Monitoring Polyunsaturated fatty acid |
| Zdroj: | Science of The Total Environment. 499:36-46 |
| ISSN: | 0048-9697 |
| Popis: | Analyses of the risks and benefits of consuming fish assess the content of beneficial fatty acids found in fish relative to harmful pollutants such as methylmercury (MeHg). Quantifying the effect of eutrophication on mercury (Hg), selenium (Se) and essential fatty acids (EFAs) in fish is necessary to determine how measures of risk vary with productivity. Total Hg and MeHg, Se and fatty acids, including the EFA eicosapentaenoic acid (EPA, 20:5n − 3) and docosahexaenoic acid (DHA, 22:6n − 3), were analyzed in Bighead Carp (Hypophthalmichthys nobilis) dorsal muscle tissue from seven subtropical reservoirs of eastern China. Individual elements and fatty acids, as well as derived measures of risk (Se:Hg and hazard quotient, HQEFA) were regressed against indicators of eutrophication, including total phosphorous (TP), chlorophyll-a (chl-a) and phytoplankton species composition. We found low MeHg concentrations (range = 0.018–0.13 μg/g ww) and Se concentrations (range = 0.12–0.28 μg/g ww), and Se:Hg molar ratios that were well above 1.0, indicating a low risk of Hg toxicity. Bighead Carp had a high content of total polyunsaturated fatty acids (∑ PUFAs = 44.2–53.6%), which included both EPA (6.9–12.5%) and DHA (16.1–23.2%). However, fish had significantly lower Se:Hg molar ratios in reservoirs with high TP, and lower EPA content with increasing plankton density (i.e. higher chl-a). Phytoplankton species composition predicted Se concentrations, but not Hg concentrations or EFA content. Overall, Hg concentrations in Bighead Carp were very low relative to consumption guidelines, and Se concentrations were adequate to confer protective benefits against MeHg toxicity. Our findings suggest that changes to plankton species composition and density with eutrophication may result in fish of lower nutritional value and thus increase risks to fish consumers by changing the availability of Se and EPA relative to MeHg. |
| Databáze: | OpenAIRE |
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