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DOI : , Vol.19, No.4, 57 ~ 65, 2011
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| Title |
| Effect of Copper Ion(Cu++) on Chronic Toxicity of Water Flea; Daphnia magna, Daphnia sp. and Moina macrocopa |
| 김규리 Kyu Ri Kim , 김금용 Keum Yong Kim , 이상일 Sang Ill Lee |
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| Abstract |
| This study was focused on the estimation of the effect of copper ions on the chronical ecotoxicity of water fleas including Daphnia sp., Moina macrocopa and Daphnia magna. With long term exposure of copper ions, rates of growth, reproduction and transformation of each species were examined. Experiments were carried out for over 21days for Daphnia magna and Daphnia sp. and over 10days for Moina macrocopa with concentration of copper ions of 0, 1, 3, 5, 10 ug/L in culture media. There was decreasing tendency of the survival rate observed of water fleas, as the increase of copper ion concentration in culture media. The time required for first birth of water fleas was less in Moina macrocopa, followed by Daphnia sp. and Daphnia magna. But, longer periods were required with increase of copper ions in every species. For testing period, the number of transformation of every species was decreased with the increase of copper ion. Rapid decrease of transformation rate was observed at Daphnia magna and Daphnia sp. with increase of copper ions. The size of neonates, born from the survived adult water flea was significantly smaller with increase of toxic concentration. Also, the number of water flea produced per day was decreased in the order of Daphnia magna, Daphnia sp. and Moina macrocopa. Also, the death rate of neonate was increased with increase of copper ions in order of Daphnia magna > Daphnia sp. > moina macrocopa. The sensitivity of tested water fleas for the toxicant(Cu) was in order of Daphnia magna > Daphnia sp. > moina macrocopa. |
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| Key Words |
| copper ion, Daphnia magna, Daphnia sp., Moina macrocopa, chronic toxicity |
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