title: The barnacle Balanus amphitrite as a biomonitor for Cd: radiolabelled experiments.
abstract: Radiolabelled experiments were carried out to measure necessary parameters in the development of a biodynamic ecotoxicological simulation model of Cd accumulation in the barnacle biomonitor Balanus amphitrite. The Cd uptake rate constant from the dissolved phase, the Cd assimilation efficiency (AE) from suspended particulate matter (SPM) and the efflux rate constant were obtained using (109)Cd. A Cd uptake rate constant from the dissolved phase (k(u)) of 0.0072 Lg(-1)h(-1) was determined for the barnacle under environmentally realistic dissolved Cd concentrations (maximum of 400 ng L(-1)). Cd AE from SPM was determined from the barnacle feeding on SPM with low and high chl a concentrations, resulting in AEs of 39.0% and 48.7%, respectively, and an efflux rate of 0.0072 d(-1). The difference between the AEs resulted from differences in chl a:SPM ratios suggesting a general tendency of higher AE when SPM is enriched with chl a. These results reinforce that the accuracy of ecotoxicological models for metal accumulation in organisms depends on how representative the selected food items are of the organism's natural diet.
authors.affiliation: Department of Chemistry, School of Pharmacy and Molecular Science, James Cook University, Townsville, Queensland 4811, Australia. dasilva.eduardoteixeira@gmail.com
authors.forename: Eduardo Teixeira
authors.initials: ET
authors.lastname: da Silva
authors.forename: Michael
authors.initials: M
authors.lastname: Ridd
authors.forename: David
authors.initials: D
authors.lastname: Klumpp
mesh_terms: D000818:Animals; D002104:Cadmium / Q000032:analysis* / Q000493:pharmacokinetics; D002106:Cadmium Radioisotopes / Q000032:analysis / Q000493:pharmacokinetics; D002734:Chlorophyll / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D020387:Food Chain; D001468:Thoracica / Q000737:chemistry / Q000502:physiology*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D002106:Cadmium Radioisotopes; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002734:Chlorophyll