The effects of low lead levels on the growth and reproduction of the African earthworm Eudrilus eugeniae (Oligochaeta)

The effects of sublethal concentrations of lead nitrate on the growth and r eproduction of the African composting earthworm species, Eudrilus eugeniae, was studied by exposing worms in an organic substrate to lead-nitrate-cont aminated food over a period of 76 days. The results revealed that growth wa s initially affected negatively by the presence of lead, while the maturati on rate and cocoon production were not affected. In agreement with other st udies on Eisenia fetida, cocoon Viability was affected negatively by lead, making this a sensitive toxicity endpoint.