Abstract
The toxicity of heavy metals to marine invertebrates has been widely investigated; however, the effects on marine sedentary polychaetes have largely been ignored. The toxicity of copper, aluminium, lead, nickel, and zinc on fertilization, embryogenesis, and larvae of Hydroides elegans was examined in laboratory acute-toxicity tests. Exposure to metal during fertilization or early developmental stages leads to fertilization block and arrested development, which resulted in morphologic abnormalities in embryo and larvae. Fertilization rate showed a drastic decrease at the highest metal concentration tested. Embryos of H. elegans showed a differential response to metals, and the responses were stage-specific. The different morphologic effects of heavy metals reflect differentiation of the early embryonic cells. For individual metals, the toxicity ranking for 24−hour trochophore larvae was Cu > Al > Pb > Ni > Zn, with EC50 values of 0.122, 0.210, 0.231, 0.316, and 0.391 mg l−1, respectively. Rate of larval development and embryogenesis were the most sensitive end points, although the latter is more advisable for routine assessment of seawater quality because of its greater simplicity. In addition to bivalves and sea urchins, polychaete embryos can provide biologic criteria for seawater quality taking into account the sensitivity of a polychaete and contributing to the detection of harmful chemicals with no marked effect on the species currently in use in seawater quality bioassays.
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We thank Dr. Thiagarajan Raman, Department of Zoology, University of Madras, for his help in critical review and valuable comments on the manuscript.
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Gopalakrishnan, S., Thilagam, H. & Raja, P.V. Toxicity of Heavy Metals on Embryogenesis and Larvae of the Marine Sedentary Polychaete Hydroides elegans . Arch Environ Contam Toxicol 52, 171–178 (2007). https://doi.org/10.1007/s00244-006-0038-y
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DOI: https://doi.org/10.1007/s00244-006-0038-y