微量重金属对水螅摄食行为的毒性研究

目的]为水螅毒理学研究提供技术支持。方法]分别探索3种微量重金属离子(Cu2+、Cr6+、Zn2+)抑制水螅摄食和摄食反应的最低可见效应浓度(LOEC)。结果]Cu2+、Zn2+、Cr6+抑制水螅摄食的LOEC分别为0.014、0.51和6×10-5mg/L,其抑制水螅摄食反应的LOEC分别为0.030、.55和8×10-5mg/L。Cu2+、Zn2+、Cr6+对水螅摄食反应的无可见效应浓度(NOCE)分别是0.01、0.5和6×10-5mg/L。Cu2+、Zn2+、Cr6+对水螅的摄食行为均具有明显的抑制作用,其毒性为Cr6+>Cu2+>Zn2+。结论]利用水螅的不同摄食特性来检测水体的微毒毒性是可行的。该技术具有较高的检测效率,优于常规的动物浸泡方法。

Study on the Toxicity of Trace Heavy Metals on the Feeding Behavior of Hydra peseudoligactis

Objective] The aim of the research was to provide the technical support for the toxicological study on Hydra peseudoligactis.Method] The lowest observed effect concentration(LOEC) of 3 kinds of trace heavy metal ions(Cu2+,Cr6+and Zn2+) for inhibiting the feeding and the feeding response of H.peseudoligactis. Result] LOEC of Cu2+,Zn2+ and Cr6+ for inhibiting the feeding of H.peseudoligactis were 0.014,0.51,6×10-5 mg/L resp.and their LOEC for inhibiting the feeding response of H.peseudoligactis were 0.03,0.55,8×10-5 mg/L resp.The non-observed effect concentration(NOEC) for inhibiting the feeding response of H.peseudoligactis were 0.01,0.5,6×10-5 mg/L resp.Cu2+,Zn2+ and Cr6+ all had obvious inhibitory effects on the feeding behavior of H.peseudoligactis and their toxicity in turn was Cr6+ >Cu2+> Zn2+.Conclusion] It was feasible to determine the micro toxicity of water body by using different feeding characteristics of H.peseudoligactis.This technology had higher detection efficiency and it was better than that of conventional animal soaking method.