Dietary absorption of sediment-bound fluoranthene by a deposit-feeding gastropod using the 14C:51CR dual-labeling method

Valery E. Forbes, Thomas L. Forbes

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Polycyclic aromatic hydrocarbons (PAH) constitute a broad class of toxic, environmentally persistent, particle-reactive organic compounds that are ubiquitous in aquatic and terrestrial ecosystems. This study was designed to measure ingestion and dietary absorption of the PAH, fluoranthene, by two genotypes of a deposit-feeding gastropod using the 14C:51Cr dual-labeling method. Sediment processing rate, fluoranthene ingestion rate, selective ingestion of fluoranthene-containing particles, and fluoranthene absorption rate varied as a function of snail body size and genotype. Absorption efficiency of sediment-bound fluoranthene did not vary as a function of body size but differed between genotypes, averaging 42 to 46% for Clone A and 22 to 36% for Clone B. We could detect no significant metabolism of ingested fluoranthene to dissolved organic carbon or CO2 during 24 h following its ingestion. The 14C:51Cr dual-labeling method provides a powerful approach for investigating the dietary absorption of sediment-bound contaminants by (1) allowing the calculation of ingestion selectivity, sediment processing rate, contaminant ingestion rate, and absorption efficiency in individual small invertebrates; (2) permitting estimation of the fraction of ingested/absorbed contaminant that is metabolized and released via different routes following its ingestion; and (3) facilitating evaluation of the relative importance of porewater versus ingested sediment as routes of contaminant uptake by animals.

Original languageEnglish (US)
Pages (from-to)1002-1009
Number of pages8
JournalEnvironmental Toxicology and Chemistry
Volume16
Issue number5
StatePublished - May 1 1997

Keywords

  • Clones
  • Polycyclic aromatic hydrocarbon
  • Potamopyrgus antipodarum
  • Sediment

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