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Toxic Effects of Two Organophosphorus Pesticides on Hylarana Guentheri Tadpoles

Author: ZhongBiZuo
Tutor: GengBaoRong
School: Fujian Normal University
Course: Zoology
Keywords: Triazophos Acephate Hylarana guentheri-tadpole Toxicity
CLC: X174
Type: Master's thesis
Year: 2009
Downloads: 115
Quote: 2
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Abstract


Amphibian populations have globally declined over the past decades,now some researches have proved that pesticide pollution was one resulting in amphibian population declination.The organophosphorus pesticides have been used widely in agricultural production and become a major pollutant to environment.Hylarana guentheri is a widely distributed species in the south of China.In this study,the toxicity effects of two organophosphorus pesticides（triazophos and acephate） on the Hylarana guentheri tadpoles were investigated.The acute toxicity of triazophos and acephate to the H.guentheri tadpoles was studied.Exposed to pesticides,the body length,body weight, dismutase（SOD） activities,catalase（CAT） activities and malondialdehyd（MDA） content, the isoenzyme metabolism of tadpoles were observed.And the effects of two pesticides on the micronucleus,nucleus abnormity and DNA damage in the blood cells were also observed and detected.The result of acute toxic tests showed that triazophos is medium-toxic to the H. guentheri tadpoles,the LC50 in 96h is 5.277 mg/L,and acephate is low-toxic,the LC50 in 96h is 87.886 mg/L.Both of the two pesticides inhibited the growing development of tadpoles,the body length and body weight decreased obviously as the concentrations of pesticides increased.Both of triazophos and acephate can change antioxidant system of H. guentheri tadpole,cause some toxic effects and the SOD,CAT activities and MDA contents of amphibian can be considered as good biomarkers of pollution.Exposed to pesticides,the isoenzyme metabolism of tadpoles had changed;the EST and LDH activities were activated or inhibited.The genotoxicity effects of different doses of triazophos and acephate on H.guentheri tadpoles were evaluated by micronucleus assay and single cell gel electrophoresis（SCGE,Comet assay）.The micronucleus（MN）, nucleus abnormity frequency,the degree of DNA damage in erythrocytes were higher than those of the control group,which indicated both of two pesticides cause genotoxicity to tadpoles.In conclusion,the present study explores the ecotoxic and genotoxic effects of triazophos and acephate on H.guentheri tadpoles,reveals that the toxic mechanism of triazophos and acephate,and provides scientific methods for pollution monitoring.

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Biology > Environmental zoology
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