Lethal and sublethal effects of the sediment‐associated PCB aroclor 1254 on a meiobenthic copepod
Lethal and sublethal effects of the sediment‐associated PCB aroclor 1254 on a meiobenthic copepod
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沉积物相关 PCB Aroclor 1254 对小型底栖桡足类的致死和亚致死影响
DOI：
10.1002/etc.5620121017
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发表时间：
1993
影响因子：
4.1
通讯作者：
G. Chandler
中科院分区：
文献类型：
--
作者：
L. DiPinto;B. C. Coull;G. Chandler
使用沉积物相关多氯联苯（PCB）Aroclor 1254（即，大量沉积物中结合和/或非结合状态的多氯联苯浓度）。将50只成年桡足类的三个重复样品暴露于五种水平的受多氯联苯污染的沉积物中96小时，并与未处理的对照组和溶剂对照组进行比较。雌性的半数致死浓度几乎是雄性的两倍。为了确定PCB对桡足类繁殖输出的影响，交配对Microarthridion littorale被允许在低于LC 50值的多氯联苯1254污染的沉积物浓度下繁殖。两个实验分别重复10次和15次，每次用一对Microarthridion littorale在Copulus中进行12 d，这是雌性产生一套无节幼体和携带第二窝卵所需的正常时间。在这两个实验中，无节幼体的数量显着减少，发现与多氯联苯污染。虽然未确定无观测效应浓度，但需要高浓度的沉积物相关多氯联苯无观测效应浓度才能显著影响死亡率，而较低浓度则会损害生殖。
Acute toxicity tests were performed on field-collected copepods (Microarthridion littorale) using the sediment-associated polychlorinated biphenyl (PCB) Aroclor 1254 (i.e., PCB concentrations in bulk sediments in the bound and/or unbound states). Three replicates of 50 adult copepods were exposed to five levels of PCB-contaminated sediments for 96 h and compared to untreated controls and solvent controls. LC50 concentrations were nearly twice as high for females as for males. To determine the effects of the PCB on reproductive output of the copepods, copulating pairs of Microarthridion littorale were allowed to reproduce in concentrations of Aroclor 1254-contaminated sediments below LC50 values. Two experimental trials with 10 and 15 replicates, each with one pair of Microarthridion littorale in copulus, were conducted for 12 d, the normal time needed for females to produce one set of nauplii and carry a second clutch of eggs. In both experiments, a significant decrease in number of nauplii was found with Aroclor contamination. Although NOECs were not determined, high concentrations of the sediment-associated Aroclor NOECs were required to affect mortality significantly, whereas lower levels impaired reproduction.