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PRELIMINARY STUDIES ON TOXICITY OF Cd~(2+) AND Pb~(2+) TO HYDRA PSEUDOLIGACTIS

ZHAO Hua-bin,HU Hao-yuan,WANG Ying,CHEN Na,GAO Bin,HAO Jia-sheng(College of Life Science,Anhui Normal University,Wuhu 241000,China)  
The acute and chronic toxicity of Cd~(2+) and Pb~(2+) to Hydra pseudoligactis were studied in this paper.The result of acute toxicity experiment showed that the 96h lethal concentration(LC_(50)) of Cd~(2+) was 1.81mg/L,and the 96h LC_(50) of Pb~(2+) was 10.13mg/L.Cd~(2+) and Pb~(2+) were both poisonous to this animal and the former's toxicity was severer than the latter's.The result of chronic toxicity experiment showed that the generation time obviously prolonged when the generation number increased in the cultivating liquids containing the two ions.Moreover,the generation time of this coelenterate animal was much longer than the comparison group's when the concentration of Cd~(2+) was 0.0025mg/L,or the concentration of Pb~(2+) is 0.015625mg/L and 0.0625mg/L,suggesting the two ions in lower concentrations may promote or stimulate the growth and reproduction of Hydra pseudoligactis.
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