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Cite this paper: |
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QI Leilei, WANG Ying, SHA Jingjing, WANG You, TANG Xuexi. The toxic effects of copper on larvae of the barnacle species Chthamalus challengeri[J]. Journal of Oceanology and Limnology, 2015, 33(2): 400-409 |
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The toxic effects of copper on larvae of the barnacle species Chthamalus challengeri |
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QI Leilei, WANG Ying, SHA Jingjing, WANG You, TANG Xuexi |
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Department of Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China |
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Abstract: |
With the increased use of copper (Cu)-based antifouling (AF) paints, copper has become a potential threat to marine organisms. Experiments were performed to investigate the effects of copper on larvae of the barnacle Chthamalus challengeri. These experiments attempted to identify a more sensitive index to monitor copper pollution in marine environments. The 24 h LC50 ranged from 156.07 μg/L (nauplius Ⅱ) to 817.15 μg/L (cypris) and the no observed effect concentration (NOEC) ranged from 81.75 μg/L (nauplius Ⅱ) to 571.04 μg/L (cypris). The cypris settlement rate declined significantly when copper concentrations ≥135 μg/L. No cypris was found in the copper concentration of 60 and 75 μg/L treatment groups stressed for 22 d. Nauplius Ⅱ moulting was not affected by exposure to copper for 24 h; however, when extended to 48 h, the percent moulted in 75 μg/L treatment group was declined to 37.12%, which was significant lower (P<0.05) than that in the control group. The phototaxis of nauplius Ⅱ decreased significantly when copper concentrations ≥45 μg/L. Despite an initial significant increase at copper concentrations of 30 μg/L, ammonia excretion rate decreased when copper concentrations ≥60 μg/L. These results suggested that: (1) nauplius Ⅱ could not develop to the cypris when the copper concentration ≥60 μg/L; (2) cypris settlement is more susceptible to copper than cypris mortality rate; (3) nauplius Ⅱ is the most sensitive larval stage; (4) nauplius Ⅱ ammonia excretion rate is the most sensitive index to copper and might be as the indicator for copper pollution monitoring. |
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Key words:
copper|Chthamalus challengeri|larval stage|sensitivity|pollution monitoring
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Received: 2014-05-27 Revised: 2014-07-11 |
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