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首页> 外文期刊>Environmental toxicology and chemistry >Linking metal bioaccumulation of aquatic insects to their distribution patterns in a mining-impacted river.
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Linking metal bioaccumulation of aquatic insects to their distribution patterns in a mining-impacted river.

机译：将水生昆虫的金属生物积累与其在受采矿影响的河流中的分布方式联系起来。

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Although the differential responses of stream taxa to metal exposure have been exploited for bioassessment and monitoring, the mechanisms affecting these responses are not well understood. In this study, the subcellular partitioning of metals in operationally defined metal-sensitive and detoxified fractions were analyzed in five insect taxa. Samples were collected in two separate years along an extensive metal contamination gradient in the Clark Fork River (MT, USA) to determine if interspecific differences in the metal concentrations of metal-sensitive fractions and detoxified fractions were linked to the differences in distributions of taxa relative to the gradient. Most of the Cd, Cu, and Zn body burdens were internalized and potentially biologically active in all taxa, although all taxa appeared to detoxify metals (e.g., metal bound to cytosolic metal-binding proteins). Metal concentrations associated with metal-sensitive fractions were highest in the mayflies Epeorus albertae and Serratella tibialis, which were rare or absent from the most contaminated sites but occurred at less contaminated sites. Relatively low concentrations of Cu were common to the tolerant taxa Hydropsyche spp. and Baetis spp., which were widely distributed and dominant in the most contaminated sections of the river. This suggested that distributions of taxa along the contamination gradient were more closely related to the bioaccumulation of Cu than of other metals. Metal bioaccumulation did not appear to explain the spatial distribution of the caddisfly Arctopsyche grandis, considered to be a bioindicator of metal effects in the river. Thus, in this system the presence/ absence of most of these taxa from sites where metal exposure was elevated could be differentiated on the basis of differences in metal bioaccumulation.
机译：尽管已经利用流类群对金属暴露的不同响应进行了生物评估和监测，但是影响这些响应的机制尚未得到很好的理解。在这项研究中，在五个昆虫类群中分析了在操作定义的金属敏感和解毒组分中金属的亚细胞分配。沿克拉克福克河（美国MT）的广泛金属污染梯度，在两个不同的年份中收集了样本，以确定金属敏感级分和解毒级分的金属浓度之间的种间差异是否与相对分类单元的分布差异相关渐变。尽管所有类群似乎都对金属（例如与胞质金属结合蛋白结合的金属）具有解毒作用，但大多数Cd，Cu和Zn人体负荷都被内在化并具有潜在的生物活性。与金属敏感级分相关的金属浓度在五旬花艾波罗虫和小Serratella tibialis中最高，它们在受污染最严重的地点很少见或缺失，但发生在受污染较少的地方。相对较低浓度的铜是耐性类群Hydropsyche spp常见的。和Baetis spp。，分布广泛，在河流污染最严重的地区占主导地位。这表明，与其他金属相比，沿污染梯度的生物分类分布与铜的生物富集关系更为密切。金属的生物积累似乎不能解释毒蛾圆弧虫的空间分布，认为该虫是河流中金属效应的生物指标。因此，在该系统中，可以根据金属生物蓄积的差异来区分是否存在来自金属暴露程度升高的部位的大多数这些分类单元。

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