Institut national de recherche scientifique - Eau Terre Environnement, Université du Québec, 490 rue de Couronne, Quebec City, QC, Canada G1K 9A9.
Environ Pollut. 2013 May;176:254-60. doi: 10.1016/j.envpol.2013.01.032. Epub 2013 Feb 26.
We measured selenium (Se) speciation in the waters of 16 lakes located near two major metal smelters and compared it to Se concentrations in a potential biomonitor, the planktivorous insect Chaoborus. We used this sentinel because planktonic algae and crustaceans, which are lower in the trophic chain leading to Chaoborus, are more difficult to separate and identify to species, whereas many fish species are not obligate planktivores. Percentages of selenate and organo-Se were generally higher in acidic lakes, whereas those of selenite were usually greater in alkaline waters. Chaoborus Se concentrations varied widely among lakes and, with the exception of a single high-sulfate lake, were significantly and highly correlated with those of dissolved organo-Se plus selenate (Se(VI)). We suggest that Chaoborus larvae would be highly effective for monitoring the Se-exposure of planktonic food webs in lakes.
我们测量了位于两个主要金属冶炼厂附近的 16 个湖泊中的硒（Se）形态，并将其与潜在的生物监测器——食浮游动物的昆虫 Chaoborus 中的 Se 浓度进行了比较。我们选择这个监测器是因为浮游藻类和甲壳类动物处于食物链的较低位置，与 Chaoborus 相比，它们更难分离和鉴定到物种，而许多鱼类不是专性食浮游动物的。在酸性湖泊中，硒酸盐和有机硒的比例通常较高，而在碱性水中，亚硒酸盐的比例通常较高。Chaoborus 中的 Se 浓度在湖泊之间差异很大，但除了一个高硫酸盐湖泊外，与溶解的有机硒加硒酸盐（Se(VI)）的浓度显著且高度相关。我们认为，Chaoborus 幼虫非常适合监测湖泊中浮游食物网的 Se 暴露情况。
