Abstract
Dichlorvos is an environmental hormone insecticide, and several studies have demonstrated its toxic effects on C. elegans. However, little is known about its effect on the population growth rate of nematode cohort. After exposing worms to dichlorvos (1, 10 and 50 μmol/L) for 4h, a life table experiment was conducted by a hanging-drop method with a semi-fluid culture medium. Results showed that the survival rate and fecundity of worms decreased significantly, and concentration-dependent inhibitions were also observed in net reproductive rate, total fertility rate, average lifespan and population growth rate, so these parameters were approved to be sensitive to dichlorvos, and could be used as monitors of dichlorvos pollutant. The life table experiment measured several life-cyle traits simultaneously, and integrated them into population growth rate, which reflects a population’s response to a specific pollutant. The experimental results proved that life table experiment was important for assessment of pollutants.
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