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Effect of some Environmental Factors on the Toxicity of Pesticide "Lambda-Cyhlothrin" in Fresh Water Snail Lymnaea euricularia L. | ||
| Magazine of Al-Kufa University for Biology | ||
| Article 1, Volume 3, Issue 2, 2011, Pages 42-55 | ||
| Abstract | ||
| This Study deal with the effect of changing in some ecological proprieties on the Toxicity of Pesticide (lambda-cyhlothrin) by used the snail Lymnaea euricularia as test organism.The snail under study collected from Hilla River near Al-Hindia barrage ,the samples transport by special bags ,these organisms are accumulated by putting in aquarium 20 L contained a same position river water in laboratory degree 25c , aeration of 8h. and lighting as natural light(12 h light and 12 h dark),then they left for 5 days to accumulation , at this time the aquatic plant(Ceratophylum demersum) was ther,s food which was brought from Hilla River .After accumulation dead or tired snails was removed while active and live snails were stilled for using in toxicity tests.Three concentration of insecticide were user (0.1,0.5 and 1) mg/l as three replicate for each concentration, 10 accumulated snails were putting in each replicate. The experiment has taken 168 h. for each concentration wich during mortality calculated and LT50,LT90,the toxicity of pesticide has increased by concentration and exposure time increasing. Some of ecological factors was studies as salinity an p H by man experiments contained salinity percentage increasing in their water( 0.56) o% to( 1) o%, that the reason of pesticide toxicity decrease in all concentration, LT50 andLT90 were calculated. p H was changed for alkalinity to be 9 and for acidity to be 5 ,p H increasing to alkalinity was reduced toxicity in all concentration while it was increased under acidity conditions. LT50, LT90 and mortality were calculated in all concentrations under alkalinity and acidity conditions respectively . | ||
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