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首页> 外文期刊>Environmental toxicology and chemistry >VARIATION IN RIPARIAN CONSUMER DIET COMPOSITION AND DIFFERENTIAL BIOACCUMULATION BY PREY INFLUENCE THE RISK OF EXPOSURE TO ELEMENTS FROM A RECENTLY REMEDIATED FLY ASH SPILL
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VARIATION IN RIPARIAN CONSUMER DIET COMPOSITION AND DIFFERENTIAL BIOACCUMULATION BY PREY INFLUENCE THE RISK OF EXPOSURE TO ELEMENTS FROM A RECENTLY REMEDIATED FLY ASH SPILL

机译：捕食者的日粮中消费者饮食成分的变化和生物量的累积影响粉煤灰溢出对元素的暴露风险

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Emerging aquatic insects play a key role in transporting aquatic nutrients and contaminants to riparian consumers. However, little is known about how within- and between-year variation in the diet or patterns of element bioaccumulation in emerging insect taxa may influence the risk of exposure to wildlife. During 2 breeding seasons, the composition of the diet of tree swallows (Tachycineta bicolor) was examined at several colonies that were exposed to element contamination from a remediated coal fly ash spill to determine how variation in the diet influenced the risk of exposure to elements. The proportion of the diet that consisted of insects with an aquatic larval stage was positively related to concentrations of As, Fe, Se, and Tl in the samples. The proportion of the diet that consisted of Chironomidae (midges) was positively related to exposure to these elements at most colonies within and between years. Ephemeroptera (mayflies) contained higher concentrations of Se than midges, including 17 samples with concentrations of Se above 5 μg/g dry mass, the threshold of toxicological concern for birds. This was even the case at colonies several kilometers downstream from the spill. The results indicate that greater consideration should be given to the pattern of element bioaccumulation among different prey taxa and their relative importance in the diet to better assess the risk of contaminant exposure.
机译：新兴水生昆虫在将水生营养物和污染物输送到河岸消费者中起着关键作用。然而，人们对新兴昆虫类群中饮食或元素生物积累模式的年内和年际变化如何影响暴露于野生生物的风险知之甚少。在两个繁殖季节期间，在几个殖民地检查了树燕子的饮食结构（Tachycineta bicolor），这些殖民地暴露于经过补救的粉煤灰溢出物的元素污染中，以确定饮食中的变化如何影响元素暴露的风险。由具有水生幼虫阶段的昆虫组成的饮食所占比例与样品中As，Fe，Se和Tl的浓度呈正相关。在数年之内和数年之间的大多数菌落中，由猫科（mid虫）组成的饮食比例与这些元素的暴露呈正相关。 phe属（may）的硒含量高于ges，其中包括17份硒含量高于5μg/ g干物质的样品，这是鸟类对毒理学的关注阈值。甚至在泄漏事故下游几公里处的殖民地也是如此。结果表明，应更多考虑不同猎物类群中元素生物富集的模式及其在饮食中的相对重要性，以更好地评估污染物暴露的风险。

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