| 摘要: |
| 对1991年8月在青岛崂山沙子口海区底层沙中拖网采集的体长为1.8–2.2cm的青岛文昌鱼，进行不同剂量的Cu2+、Zn2+、Cr6+等重金属的毒性影响实验。结果表明，青岛文昌鱼对重金属反应敏感，重金属如超过一定浓度便可引起文昌鱼中毒乃至死亡，但微量的重金属则能促进文昌鱼的生长。 |
| 关键词: 青岛文昌鱼 Cu Zn Cr |
| DOI： |
| 分类号: |
| 基金项目:中国科学院“八五”重大课题资助项目，A08－920813号 |
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| TOXIC EFFECTS OF SEVERAL HEAVY METAL ON AMPHIOXUS AND LIVING ACTIVITY OF BRANCHIOSTOMA BELCHERI TSINGTAOENSIS TCHANG ET KOO |
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WU Xian-han, JIANG Xin-ji, ZHANG Bao-lu, QU Yan-mei
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Institute of Ocaenology, The Chinese Academp of Scieiences, Qingdao, 266071
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| Abstract: |
| This paper reports toxic effects of several heavy metals such as copper, zinc and cadmium on amphioxus (Branchiostoma belcheri tsingtaoensis Tchang and Koo) and its growth.
It will make amphioxus poisoned when the contents of heavy metal ions in the sea water exceed a concentration limit. Firstly its living activity decreases, then lost moving ability and dead, finally decayed in its whole abdomen. The semitoxic concentration of copper is 0.5×10-6–1.0×10-6 in 48 hours; the semilethal concentration of copper is 0.5×10-6 in 72 hours and 1.0×10-6 in 120 hours; the semitoxic concentration of zinc is 50.0×10-6 in 48 hours, but it takes 72 hours to get semilethal on this concentration; the semitoxic concentration of cadmium is 50.0×10-6 in 48 hours, but it takes 120 hours to get semilethal on this concentration. The dosages of Cu2+, Zn2+, Cr6+ are larger, and the death times of amphioxus are shorter. In the three heavy metals, the toxic effects of Cu2+ are the highest, Zn2+ less, and Cr6+ the least.
The trace heavy metals are necessary to animals growth just as amphioxus. Cu2+ (0.01×10-6 or 0.1×10-6), Zn2+ (0.01×10-6 or 0.1×10-6), Cr6+ ((0.2×10-6 or 2.0×10-6) are able to promote the growth of amphioxus, increasing its weight 5–8 percent. The growth of amphioxus can be promoted if trace Cu2+, Zn2+, Cr6+ are added into the seawater. |
| Key words: Branchiostoma belcheri tsingtaoensis Tchang et Koo, Cu, Zn, Cr |
