Toxicity of lead, cadmium and mercury on embryogenesis, survival, growth and metamorphosis of Meretrix meretrix larvae |
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Authors: | Qing Wang Baozhong Liu Hongsheng Yang Xiaoyu Wang Zhihua Lin |
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Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(2) Graduate University, Chinese Academy of Sciences, 100049 Beijing, China;(3) Zhejiang Wanli University, 315100 Ningbo, China; |
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Abstract: | In order to assess the toxicity of heavy metals on the early development of Meretrix meretrix, the effects of mercury (Hg), cadmium (Cd) and lead (Pb) on embryogenesis, survival, growth and metamorphosis of larvae were
investigated. The EC50 for embryogenesis was 5.4 μg l−1 for Hg, 1014 μg l−1 for Cd and 297 μg l−1 for Pb, respectively. The 96 h LC50 for D-shaped larvae was 14.0 μg l−1 for Hg, 68 μg l−1 for Cd and 353 μg l−1 for Pb, respectively. Growth was significantly retarded at 18.5 μg l−1 (0.1 μM) for Hg, 104 μg l−1 (1 μM) for Cd and 197 μg l−1 (1 μM) for Pb, respectively. The EC50 for metamorphosis, similar to 48 h LC50, was higher than 96 h LC50. Our results indicate that the early development of M. meretrix is highly sensitive to heavy metals and can be used as a test organism for ecotoxicology bioassays in temperate and subtropical
regions. |
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