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中文摘要：
Cypridopsis vidua是少数能在重污染水体中生存的介形类之一.本文采用急性毒性实验方法，研究了Cd2＋对介形类C.vidua及其肠壁结构的影响，结果表明，24、48、72和96h时Cd2＋对C.vidua的半致死浓度（LC50）分别为5.00、2.01、0.46和0.14 mg/L，安全浓度为0.014 mg/L.在急性毒性试验的基础上，于安全浓度上下分别设置了两个Cd2＋实验浓度对介形类进行攻毒研究，目的是进一步探讨在安全浓度附近，Cd2＋对C.vidua肠壁细胞的损伤情况，实验持续7 d.显微结果显示，在安全浓度以下时，C.vidua的胃肠道结构基本没有受到损伤，但超过安全浓度后，C.vidua的胃肠道结构损伤程度于96h以内表现出了一定的时间和剂量效应，但至第7天时部分幸存下来的C.vidua其受损胃肠道结构出现一定程度的恢复，但已无法恢复到最初的状态了；亚显微切片显示，肠壁细胞的膜结构、胞质、胞器等均有不同程度的损伤，且随镉离子浓度的升高损伤明显加剧，其中细胞的膜结构损伤尤为严重.
英文摘要：
Cypridopsis vidua is one of the few ostracods which can surrive from heavy pollution water. The toxic effects of Cd2＋ on C. vidua and its intestinal ultrastructure were examined using a static renewal system. The LC50 values for cadmium in C. vidua were 5.00, 2.01, 0.46 and 0.14 mg/L at 24, 48, 72 and 96 h exposure respectively, and the safe concentration of Cd2＋ for long-term C. vidua survival was less than 0.014 mg/L. To observe the structure changes of its intestinal, four Cd2＋ concentrations were set up, and two of them were below the safe concentration of Cd2＋ （0.001 and 0.004 mg/L） and the other concentrations were above its safe concentration （0.016 and 0.064 mg/L）. The experiment lasted for 7 days. When microstructure of C. vidua was observed, the gastrointestinal orga- nization was not damaged below the safe concentration; while the degree of injury showed a certain amount of time and dose effects in 24-72 hours above the safe concentration, and some structures among those surviving animals were slightly recovered in 7 days under same concentration. Sub-microscopic analysis of intestinal cells of C. vidua in two concentrations （0.004 and 0.064 mg/L） groups showed, different degrees of structure damage were found in the cell membrane, cytoplasm and organelles, which worsened with increasing Cd2＋ con- centrations. Among these cellular structures, the damage to the membrane system of the cell was especially serious.
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