title: Observations on the interaction of zinc and cadmium uptake rates in crustaceans (amphipods and crabs) from coastal sites in UK and France differentially enriched with trace metals.
abstract: This paper presents results on the possible interaction of zinc and cadmium uptake rates in crustaceans. Zn and Cd uptake rates were measured in amphipods (Orchestia gammarellus) and crabs (Carcinus maenas and Pachygrapsus marmoratus) from five coastal sites in Britain and France subjected to different degrees of trace metal enrichment. The presence or absence of 100 µg l(-1) of one metal (1.53 µM l(-1) Zn, 0.89 µM l(-1) Cd) had an inconsistent effect on the rate of uptake of the other metal by O. gammarellus. The presence or absence of 50 µg l(-1) of either zinc (0.76 µM l(-1)) or cadmium (0.45 µM l(-1)) had no effect on the rate of uptake of the other metal by C. maenas (from Millport, Scotland). Zinc and cadmium uptake rates were correlated in individual amphipods and crabs of both species from the five sites. These correlations indicate that zinc and cadmium might share common routes of uptake from solution by crustaceans, but the metals do not consistently interact competitively or synergistically at the exposure concentrations investigated. Regression coefficients of the relationship between zinc and cadmium uptake rates in amphipods and crabs showed occasional, but inconsistent, differences between sites and over time. All three crustaceans take up zinc from solution at a higher rate than cadmium for the same total dissolved metal molar concentration, but at a lower rate than cadmium per free metal ion molar concentration.
authors.affiliation: Department of Zoology, The Natural History Museum, Cromwell Road, SW7 5BD, London, UK
authors.initials: PS
authors.lastname: Rainbow
authors.initials: C
authors.lastname: Amiard-Triquet
authors.initials: JC
authors.lastname: Amiard
authors.initials: BD
authors.lastname: Smith
authors.initials: WJ
authors.lastname: Langston