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首页> 外文期刊>Environmental toxicology and chemistry >BIO ACCUMULATION DYNAMICS AND EXPOSURE ROUTES OF Cd AND Cu AMONG SPECIES OF AQUATIC MAYFLIES
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BIO ACCUMULATION DYNAMICS AND EXPOSURE ROUTES OF Cd AND Cu AMONG SPECIES OF AQUATIC MAYFLIES

机译：水生MAY科动物中Cd和Cu的生物累积动力学和暴露途径

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摘要

Consumption of periphyton is a potentially important route of metal exposure to benthic invertebrate grazers. The present study examined the bioaccumulation kinetics of dissolved and dietary Cd and Cu in five species of mayflies (class Insecta). Artificial stream water and benthic diatoms were separately labeled with enriched stable metal isotopes to determine physiological rate constants used by a biokinetic bioaccumulation model. The model was employed to simulate the effects of metal partitioning between water and food, expressed as the bioconcentration factor (BCF), as well as ingestion rate (IR) and metal assimilation efficiency of food (AE), on the relative importance of water and food to metal bioaccumulation. For all test species, the contribution of dietary uptake of Cd and Cu increased with BCF. For a given BCF, the contribution of food to the body burden increased with kuf, the metal uptake rate constant from food that combined variation in IR and AE. To explore the relative importance of water and diet exposure routes under field conditions, we used estimated site-specific aqueous free-ion concentrations to model Cd and Cu accumulation from aqueous exposure, exclusively. The predicted concentrations accounted for less than 5% of the observed concentrations, implying that most bioaccumulated metal was acquired from food. At least for the taxa considered in this study, we conclude that consumption of metal-contaminated periphyton can result in elevated metal body burdens and potentially increase the risk of metal toxicity.
机译：食用周生植物是金属暴露于底栖无脊椎动物放牧者的潜在重要途径。本研究检查了五种of类昆虫（昆虫纲）中溶解的镉和饮食中的镉和铜的生物累积动力学。用富集的稳定金属同位素分别标记人造河水和底栖硅藻，以确定生物动力学生物蓄积模型使用的生理速率常数。该模型用于模拟水和食物之间的金属分配，以生物富集因子（BCF）以及食物的摄入速率（IR）和金属同化效率（AE）表示，对水和食物的相对重要性食物对金属的生物蓄积。对于所有测试物种，随着BCF膳食摄入Cd和Cu的贡献增加。对于给定的BCF，食物对人体负担的贡献随着kuf的增加而增加，而kuf是结合了IR和AE变化的食物对金属的吸收速率常数。为了探索田间条件下水和饮食接触途径的相对重要性，我们仅使用估计的特定于场地的水自由离子浓度来模拟水接触中镉和铜的积累。预测的浓度不到所观察到的浓度的5％，这意味着大多数生物富集的金属都是从食物中获取的。至少对于本研究中考虑的分类单元，我们得出结论，食用金属污染的附生植物会导致金属体负担增加，并可能增加金属毒性的风险。

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