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| Acute and chronic toxicity of glyphosate to Daphnia magna |
| Received:March 23, 2016 |
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| KeyWord:glyphosate;Daphnia magna;acute toxicity;chronic toxicity;breeding |
| Author Name | Affiliation | E-mail | | CAI Xiao-yu | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | JIANG Jin-lin | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China | jjl@nies.org | | SHAN Zheng-jun | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China | szj@nies.org | | BU Yuan-qing | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China | | | XU Wei-li | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China | | | ZHOU Jie-lian | Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China | |
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| Abstract: |
| Glyphosate is widely used in agriculture as a broad spectrum herbicide.With the increasing of application, it's effects on aquatic organisms have also been widely concerned. 99.5% glyphosate technical was selected to assess the acute toxicity to Daphnia magna and the chronic effects on the growth and reproduction after 21-d exposure.The results of acute toxicity test showed that glyphosate had low acute toxicity against Daphnia magna, the 48h-EC50 was 151.057 mg·L-1. The results of chronic test showed that the first reproduction time, the number of total offspring per female, the number of brood per female and the body length of Daphnia magna were significantly affected when exposure to glyphosate at the concentration of 3.125 mg·L-1, the number of total offspring per female and number of brood per female of Daphnia magna were significantly reduced. Taking into account of each index in this experiment, the 21-d lowest observed effect concentration(LOEC) was 3.125 mg·L-1 and the no observed effect concentration(NOEC) was 1.56 mg·L-1. In addition, when exposed to glyphosate at 25 mg·L-1, the first reproduction time of Daphnia magna could be dramaticlly prolonged. However, the first molting time and the number of molting of Daphnia magna had not been observed during the 21-d glyphosate exposure. The results suggested that glyphosate had inhibiting effects on the growth and reproduction of Daphnia magna. |
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