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首页> 外文期刊>Environmental Science and Pollution Research >Differential bioaccumulation of potentially toxic elements in benthic and pelagic food chains in Lake Baikal
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Differential bioaccumulation of potentially toxic elements in benthic and pelagic food chains in Lake Baikal

机译：贝加尔湖底栖和中上层食物链中潜在毒性元素的差异生物富集

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Lake Baikal is located in eastern Siberia in the center of a vast mountain region. Even though the lake is regarded as a unique and pristine ecosystem, there are existing sources of anthropogenic pollution to the lake. In this study, the concentrations of the potentially toxic trace elements As, Cd, Pb, Hg, and Se were analyzed in water, plankton, invertebrates, and fish from riverine and pelagic influenced sites in Lake Baikal. Concentrations of Cd, Hg, Pb and Se in Lake Baikal water and biota were low, while concentrations of As were similar or slightly higher compared to in other freshwater ecosystems. The bioaccumulation potential of the trace elements in both the pelagic and the benthic ecosystems differed between the Selenga Shallows (riverine influence) and the ListvenichnyA Bay (pelagic influence). Despite the one order of magnitude higher water concentrations of Pb in the Selenga Shallows, Pb concentrations were significantly higher in both pelagic and benthic fish from the ListvenichnyA Bay. A similar trend was observed for Cd, Hg, and Se. The identified enhanced bioavailability of contaminants in the pelagic influenced ListvenichnyA Bay may be attributed to a lower abundance of natural ligands for contaminant complexation. Hg was found to biomagnify in both benthic and pelagic Baikal food chains, while As, Cd, and Pb were biodiluted. At both locations, Hg concentrations were around seven times higher in benthic than in pelagic fish, while pelagic fish had two times higher As concentrations compared to benthic fish. The calculated Se/Hg molar ratios revealed that, even though Lake Baikal is located in a Se-deficient region, Se is still present in excess over Hg and therefore the probability of Hg induced toxicity in the endemic fish species of Lake Baikal is assumed to be low.
机译：贝加尔湖位于西伯利亚东部，地处广阔的山区中心。尽管该湖被认为是一个独特而原始的生态系统，但仍存在该湖人为污染的现有来源。在这项研究中，分析了来自贝加尔湖受河流和中上层影响场所的水，浮游生物，无脊椎动物和鱼类中潜在毒性微量元素As，Cd，Pb，Hg和Se的浓度。与其他淡水生态系统相比，贝加尔湖水和生物区系中的Cd，Hg，Pb和Se浓度较低，而As的浓度则相似或略高。在上层生态系统和底栖生态系统中，微量元素的生物蓄积潜力在Selenga Shallows（河流影响）和ListvenichnyA Bay（中游影响）之间有所不同。尽管Selenga浅层中铅的水含量高出一个数量级，但ListvenichnyA湾中上层鱼类和底栖鱼类中的Pb浓度均显着较高。 Cd，Hg和Se的趋势相似。在中上层影响的ListvenichnyA湾中，确定的污染物生物利用度的提高可能归因于用于污染物络合的天然配体的含量较低。汞在底栖和上层贝加尔湖食物链中都有生物放大作用，而砷，镉和铅则被生物稀释。在这两个地方，底栖鱼类中的汞浓度比浮游鱼类高约7倍，而浮游鱼类的砷浓度比浮游鱼类高2倍。计算得出的硒/汞摩尔比表明，即使贝加尔湖位于缺硒地区，硒的含量仍超过汞，因此，汞在贝加尔湖特有鱼类中诱发毒性的可能性被假定为低。

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