Comparative toxicity of crude oil derivatives-hydroquinone, resorcinol and catechol to gametes and embryos of the sea urchin Tripneustes gratilla L.
The toxicity of the monocyclic aromatic hydrocarbons - hydroquinone, resorcinol and catechol - to gametes and embryo-larvae of the sea urchin Tripneustes gratilla L. was investigated. The treatment of gametes with the toxicants for three minutes prior to fusion caused a significant dose-dependent in...
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| Format: | text |
| Language: | English |
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Animo Repository
1989
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| Online Access: | https://animorepository.dlsu.edu.ph/etd_masteral/1230 |
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| Institution: | De La Salle University |
| Language: | English |
| Summary: | The toxicity of the monocyclic aromatic hydrocarbons - hydroquinone, resorcinol and catechol - to gametes and embryo-larvae of the sea urchin Tripneustes gratilla L. was investigated. The treatment of gametes with the toxicants for three minutes prior to fusion caused a significant dose-dependent inhibition of fertilization, cleavage, hatching of the blastula, gastrula and pluteal development. Marked dose-related cytolysis was noted accompanied by bleb-formation and cytoplasmic disintegration. The toxicants also caused significant gross morphological damage characterized by exogastrula formation and skeletal malformation in the said sea urchin embryo-larvae. These observations indicate that the responses of the early developmental stages of this sea urchin species to the toxicants were stage-specific i.e. the pluteus being most affected while fertilization was least affected. The toxicity of the test chemicals to T. gratilla gametes and embryo-larvae decreased in the order: catechol hydroquinone resorcinol. Sensitivity to gamete pretreatment is in the order: pretreated sperms + pretreated eggs pretreated sperms + untreated eggs untreated sperms + pretreated eggs. |
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