Life-history effects of arsenic toxicity in clades of the earthworm Lumbricus rubellus

C J Anderson, P Kille, A J Lawlor, D J Spurgeon

Research output: Contribution to journalArticlepeer-review

Abstract

Exposures of Lumbricus rubellus to a series of arsenic concentrations in soil were used to assess life-stage (juvenile, adult) and genotype specific sensitivities, to calculate population growth rate (λ) and to assess patterns of As accumulation. Significant mortality was seen in juveniles at 125 mg/kg As, while growth and maturation was affected from 36 mg/kg and above. In adults, cocoon production at the highest concentration (125 mg/kg) was significantly reduced. Phylogenetic analysis was performed by comparison of mitochondrial sequences to establish genotypic variation among juveniles. Three clades with more than 7.5% divergent were described, with 70% of earthworms belonging to a single clade. Date of and mass at maturation was significantly different between clades, but clades were not differentially As sensitive. Parameter λ was reduced at 36 mg/kg As and was negative at 125 mg/kg As, suggesting impacts and population stability and potential extinction at environmentally relevant concentrations.

Original languageEnglish
Pages (from-to)200-7
Number of pages8
JournalEnvironmental Pollution
Volume172
DOIs
Publication statusPublished - Jan 2013

Keywords

  • animals
  • Arsenic
  • genotype
  • life cycle stages
  • oligochaeta
  • phylogeny
  • soil
  • soil pollutants

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