Abstract
Six developmental stages of the bay mussel Mutilus edulis, from fertilization to 32 h after fertilization, and also unfertilized eggs, were exposed for 1 h to different concentrations of the insecticide Sevin and its first hydrolytic product, 1-naphthol. After exposure, the larvae or eggs were separated from the pesticide solution and returned to clean water. At 48 h after fertilization, the numbers of normal and abnormal larvae were determined and 1-h EC50 values (the effective concentrations that caused anomalous development of 50% of the test animals) were calculated. The most sensitive developmental stage was the one that occurred shortly after fertilization at the time of appearance of the first polar body. Thereafter, sensitivity decreased as age increased. The EC50 of Sevin for the first polar body stage and 32-h stage were 5.3 and 24.0 mg/l of Sevin, respectively. The EC50 of l-naphthol for the first polar body stage was 5.2 mg/l. Effects of the toxicants on development were characterized by disjunction of blastomeres, a reduction in the rate of development, and asynchronous and unaligned cleavages.
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Communicated by O. Kinne, Hamburg
Technical Paper No. 3840, Oregon Agricultural Experiment Station.
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Armstrong, D.A., Millemann, R.E. Effects of the insecticide sevin and its first hydrolytic product, 1-naphthol, on some early developmental stages of the bay mussel Mytilus edulis . Marine Biology 28, 11–15 (1974). https://doi.org/10.1007/BF00389112
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DOI: https://doi.org/10.1007/BF00389112