Acute toxicity and synergism of binary mixtures of antifouling biocides with heavy metals to embryos of sea urchin Glyptocidaris crenularis

Abstract

Acute toxicity and synergism of four antifouling biocides (Irgarol 1051, dichlofluanid, tolylfluanid and Sea-Nine 211) and five heavy metals (Ni, Pb, Zn, Cd and Cu) are investigated using the sea urchin embryos of Glyptocidaris crenularis (G. crenularis) at six typical developmental stages, that is, 2-cell, 4-cell, 8-cell, blastula, gastrula and 4-arm pluteus. Our results show that the toxicity of the four biocides is in an order of Sea-Nine 211 > tolylfluanid > dichlofluanid > Irgarol 1051 and their —log EC₅₀ values at all stages are strongly linearly correlated with the 1-octanol/water partition coefficient (log P) values (correlation coefficients R > 0.72) indicating the importance of hydrophobicity for the embryonic toxicity. For the five heavy metals, the EC₅₀ ranges from 0.36 to 30.78 μM and the toxicity follows an order of Cu > Pb > Zn > Cd >Ni. The significant correlation (R > 0.79) between the —log EC50 and the bioconcentration factor (log BCF) values of metals also indicate that the bioaccumulation property of metals contributes to their aquatic toxicity. In addition, the joint effects of the biocides with the heavy metals in embryonic development are assessed by using a concentration addition model. Synergistic effects are observed in almost all 25 mixtures, showing that Cu yields the strongest while Ni the weakest synergistic toxic effects on the embryos development.

Keywords

antifouling heavy metal binary toxicity sea urchin embryo-larval bioassay

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