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首页> 外文期刊>Marine ecology progress series >Uptake pathway for Ag bioaccumulation in three benthic invertebrates exposed to contaminated sediments
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Uptake pathway for Ag bioaccumulation in three benthic invertebrates exposed to contaminated sediments

机译：暴露于受污染沉积物的三种底栖无脊椎动物中Ag生物积累的吸收途径

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We exposed 3 benthic invertebrates, the clam Macoma balthica, the polychaete Nean-thes arenaceodentata and the amphipod Leptocheirus plumulosus, to Ag-contaminated sediments to evaluate the relative importance of various uptake routes (sediments, porewater or overlying water, and supplementary food) for Ag bioaccumulation. Silver bioaccumulation was evaluated at 4 levels of sediment Ag (0.1, 0,3, 1,2 and 3.3 μmol Ag g~(-1)) and 2 levels of acid-volatile sulfide (AVS), <0.5 or ～ 40 μmol g~(-1), and compared among food treatments with or without Ag contamination, or with different food rations. L. plumulosus were incubated for 35 d in the Ag-contaminated sediments after 3 mo of Ag-sediment equilibration, and M. balthica and N. arenaceodentata for 19 d after 5 mo equilibration. Ag bioaccumulation in the 3 organisms was significantly correlated with 1N HCl-extractable Ag concentrations (Ag-SEM: simultaneously extracted Ag with AVS) in sediments. The Ag concentrations in porewater and overlying water were greatest in the sediments with least AVS, consistent with previous studies. Nevertheless, the amphipod and. clam exposed to oxic sediments (< 0.5 μmol AVS g~(-1)) accumulated amounts of Ag similar to those accumulated by organisms exposed to anoxic sediments (～ 40 μmol AVS g~(-1)), when Ag-SEM levels were comparable. The dissolved Ag source was important for bioaccumulation in the polychaete N. arenaceodentata. Amphipods fed Ag-contaminated food contained ～ 1.8-fold more tissue Ag concentrations than those fed uncontaminated food. As suggested in kinetic (DYMBAM) modeling studies, ingestion of contaminated sediments and food were the principle routes of Ag bioaccumulation by the benthic invertebrates during chronic exposure, but the relative importance of each uptake route differed among species.
机译：我们将3种底栖无脊椎动物，蛤Mac Macoma balthica，多毛Ne Nean-thes arenaceodentata和两栖动物Leptocheirus plumulosus暴露在受Ag污染的沉积物中，以评估各种摄取途径（沉积物，孔隙水或上覆水和补充食物）的相对重要性Ag的生物蓄积。在4种沉积物Ag（0.1、0.3、1,2和3.3μmolAg g〜（-1））和2种酸挥发性硫化物（AVS）（<0.5或〜40μmolg）下评估银的生物累积〜（-1），并在有或没有银污染或食物定量不同的食物处理之间进行比较。在经过3个月的Ag沉积物平衡后，将L. plumulosus在受Ag污染的沉积物中孵育35 d，并在经过5 mo的平衡后将M. balthica和槟榔N. arenaceodentata培养19 d。 3种生物中的Ag生物积累与沉积物中1N HCl可提取的Ag浓度（Ag-SEM：同时用AVS提取的Ag）显着相关。与以前的研究一致，在AVS最小的沉积物中，孔隙水和上覆水中的Ag浓度最高。尽管如此，两栖动物和。当暴露于含氧沉积物（<0.5μmolAVS g〜（-1））时，蛤的累积银量与暴露于缺氧沉积物的生物体（〜40μmolAVS g〜（-1））相似。可比。溶解的Ag源对于斑鸠多毛猪笼草的生物积累很重要。饲喂被Ag污染的食物的两栖动物组织中的Ag含量是未饲喂未污染食物的两栖动物的〜1.8倍。正如动力学（DYMBAM）建模研究中所建议的那样，在长期暴露期间，底栖无脊椎动物吸收被污染的沉积物和食物是Ag生物积累的主要途径，但是每种摄取途径的相对重要性在物种之间有所不同。

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