Comparative toxicity of crude oil derivatives-hydroquinone, resorcinol and catechol to gametes and embryos of the sea urchin Tripneustes gratilla L.

Date of Publication

1989

Document Type

Master's Thesis

Degree Name

Master of Science in Biology

College

College of Science

Department/Unit

Biology

Thesis Adviser

Armando Andaya

Defense Panel Member

Abelardo Geronimo
Gerardo C.Janairo

Abstract/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.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG01678

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

139 p., 28 cm.

Keywords

Sea urchins -- Effect of surface active agents on; Sea urchins -- Effect of chemicals on

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