Eco-toxic effects of lead and nickel on survivability, reproduction and growth of earthworm (Eudrilus eugeniae)

Abstract

The present study was carried out to determine the toxic effects of lead (Pb) and nickel (Ni) on the survivability, reproduction and growth of earthworm, Eudrilius eugeniae. Adult E. eugeniae were exposed to the varying concentrations of Pb and Ni. Mortality, growth and cocoon production were measured at every 30 days interval for 90 days. The results suggest clear dose-dependent negative effects of Pb and Ni on survivability, reproduction and growth of earthworms. A maximum reduction (43.35%) in survivability was observed in the case of Pb (0.06 ppm) followed by Ni+Pb (0.03+0.03 ppm) in which there is 31.65% decrement in survivability was observed. A similar trend was observed in growth and reproduction studies. It was concluded that the heavy metal Pb was more noxious to E. eugeniae as compared to Ni alone as well as in combinations. These results can be used for environmental monitoring and estimation of heavy metals contamination in soil.