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| Toxic Effects of Cadmium on Larvae of Chironomus riparius and Chironomus flaviplumus |
| Received:March 24, 2015 |
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| KeyWord:Chironomus riparius;Chironomus flaviplumus;Cd2+;toxicity test;LC50 |
| Author Name | Affiliation | E-mail | | DENG Xin | Yunnan Jinyu Ecological Engineering Consulting CO. Ltd, Kunming 650051, China | | | ZHOU Xiang | Yunnan Jinyu Ecological Engineering Consulting CO. Ltd, Kunming 650051, China | | | LIU Zhi-hong | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
Center for Integrated Ecology, School of Life and Environmental, Deakin University, Warrnambool Campus, Victoria 3280, Australia | | | LI Xiao-jun | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | TAI Pei-dong | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | peidtai@163.com |
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| Abstract: |
| Chironomidae are important organisms indicating the quality of water environment. Here acute(96 h) and chronic(20 d) toxicity experiments were carried out to determine the toxicity of Cd2+ on the larvae of Chironomus riparius and Chironomus flaviplumus, following the standard methods in the guideline GB/T 27859—2011(Chemicals-Sediment-water chironomid toxicity test:Spiked sediment method). The mortality, emergence rate, emergence time, and mentum deformity rate were observed. The 96 h LC50 values of cadmium to three instar C. riparius and C. flaviplumus larvae were 22.39 mg·L-1 and 33.41 mg·L-1, respectively. The 20 d LC50 values of Cd to C. riparius and C. flaviplumus were correspondingly 226.26 mg·kg-1 and 351.84 mg·kg-1. Their survival rate and mentum deformity rate were significantly positive correlated to Cd2+ concentration(P<0.01). Emergence time of C. riparius was not significantly affected by Cd2+ in the sediment, whereas that of C. flaviplumus was significantly positively correlated to Cd2+ concentration(P<0.05). However, the mortality and mentum deformity rates indicated that C. riparius was more sensitive to cadmium than C. flaviplumus. |
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