Bioaccumulation and trophic transfer of mercury in a food web from a large, shallow, hypereutrophic lake (Lake Taihu) in China
文献类型：SCI/SSCI论文
| 作者 | Wang S. F. ; Li B. ; Zhang M. M. ; Xing D. H. ; Jia Y. F. ; Wei C. Y. |
| 发表日期 | 2012 |
| 关键词 | Mercury delta C-13 and delta N-15 Trophic level Bioaccumulation Lake Taihu eutrophic lake methylmercury sediment biomagnification fish bioavailability methylation phytoplankton variability environment |
| 英文摘要 | Due to the fast development of industry and the overuse of agrichemicals in past decades, Lake Taihu, an important source of aquatic products for Eastern China, has simultaneously suffered mercury (Hg) contamination and eutrophication. The objectives of this study are to understand Hg transfer in the food web in this eutrophic, shallow lake and to evaluate the exposure risk of Hg through fish consumption. Biota samples including macrophytes, sestons, benthic animals, and fish were collected from Lake Taihu in the fall of 2009. The total mercury (THg), methyl mercury (MeHg), delta C-13 and delta N-15 in the samples were measured. The signature for delta N-15 increased with the trophic levels. Along with a diet composed of fish, the significant relationship between the delta C-13 and delta N-15 indicated that a pelagic foraging habitat is the dominant pathway for energy transfer in Lake Taihu. The concentrations of THg and MeHg in the organisms varied dramatically by similar to 3 orders of magnitude from primary producers (macrophytes and sestons) to piscivorous fish. The highest concentrations of both THg (100 ng g(-1)) and MeHg (66 ng g(-1)), however, were lower than the guideline of 200 ng g(-1) of MeHg for vulnerable populations that is recommended by the World Health Organization (WHO). The daily intake of THg and MeHg of 92 and 56 ng day(-1) kg(-1) body weight, respectively, was generally lower than the tolerable intake of 230 ng day(-1) kg(-1) body weight for children recommended by the Joint FAO/WHO Expert Committee on Food Additives. Significant relationships between the delta N-15 and the logarithm of THg and MeHg showed an obvious biomagnification of Hg along the food web. The logarithmic bioaccumulation factor of MeHg in the fish (up to 5.7) from Lake Taihu, however, was relatively low compared to that of other aquatic ecosystems. Health risk of exposure to Hg by consumption of fish for local residents is relatively low in the Lake Taihu area. Dilution of Hg levels in the phytoplankton induced by eutrophication is a possible factor inhibiting accumulation of MeHg in fish in eutrophic Lake Taihu. |
| 出处 | Environmental Science and Pollution Research |
| 卷 | 19 |
| 期 | 7 |
| 页 | 2820-2831 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0944-1344 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30748]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang S. F.,Li B.,Zhang M. M.,et al. Bioaccumulation and trophic transfer of mercury in a food web from a large, shallow, hypereutrophic lake (Lake Taihu) in China. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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