Abstract Contaminants of emerging concern (CECs) are prevalent in aquatic landscapes and may be a factor in population declines of aquatic and terrestrial fauna. Yet, there are limited data to assess the impacts of CECs to species. Understanding CEC impacts is particularly important for imperiled freshwater mussels which provide valuable ecosystem services. CEC exposure of freshwater mussels was characterized by evaluating sites with and without the federally endangered mussel (Villosa fabalis) in three subwatersheds of the Maumee River, Ohio, USA, a tributary of the Great Lakes Basin. Analyses of water, sediment, and tissue concentrations of two common mussels (Eurynia dilatata and Lampsilis cardium) indicated different CEC exposures across all 6 sites. Distinct CEC signatures were found across the three media types suggesting as mussels interact with water and sediment they may be experiencing different exposure concentrations and mixtures of CECs at different life stages. Of the 83 CECs which were detected, agricultural CECs dominated sediments, pharmaceuticals were common in tissues and water, and 16 of the 83 CECs were found co-occurring in mussel tissue, water, and sediment. There were no species differences in the CEC signatures indicating all mussels, including species of concern, may be experiencing similar exposure. Comparisons to known CEC standards indicate some exceedances in the Maumee watershed including locations of federally listed mussel species. This study provides evidence of the complexity of CEC mixes in a Great Lakes watershed and the need to understand how CECs impact declining aquatic fauna.

中文翻译：

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淡水贻贝对新出现的污染物的环境暴露：对物种保护的影响

摘要 新出现的污染物（CECs）在水生景观中很普遍，可能是水生和陆生动物种群数量下降的一个因素。然而，用于评估 CEC 对物种影响的数据有限。了解 CEC 的影响对于提供宝贵生态系统服务的濒危淡水贻贝尤为重要。淡水贻贝的 CEC 暴露的特点是评估美国俄亥俄州莫米河（五大湖流域的一个支流）的三个子流域中含有和不含联邦濒危贻贝 (Villosa fabalis) 的地点。对两种常见贻贝（Eurynia dilatata 和 Lampsilis cardium）的水、沉积物和组织浓度的分析表明，所有 6 个地点的 CEC 暴露情况不同。在三种介质类型中发现了不同的 CEC 特征，这表明当贻贝与水和沉积物相互作用时，它们可能在不同的生命阶段经历不同的暴露浓度和 CEC 的混合物。在检测到的 83 种 CEC 中，农业 CEC 在沉积物中占主导地位，药物在组织和水中常见，83 种 CEC 中有 16 种同时存在于贻贝组织、水和沉积物中。CEC 特征中没有物种差异，表明所有贻贝，包括受关注的物种，都可能经历类似的暴露。与已知 CEC 标准的比较表明 Maumee 流域的一些超标情况，包括联邦列出的贻贝物种的位置。