Uptake of cadmium by the seagrass Heterozostera tasmanica from Corio Bay and Western Port, Victoria
GJ Fabris, JE Harris and JD Smith
Australian Journal of Marine and Freshwater Research
33(5) 829 - 836
Uptake of cadmium by leaves and root-rhizomes of the seagrass H. tasmanica was studied in laboratory and field experiments. In laboratory experiments, cadmium concentration in leaves approached constant levels after exposure for 192 h to dissolved cadmium at concentrations of 40 and 400µg I-1. Root-rhizomes, separated from leaves in a partitioned container: did not attain constant cadmium levels under similar conditions. Translocation of cadmium between the leaf and the root-rhizomes was not observed. In field experiments, H. tasmanica containing cadmium at concentrations of 1.8 and 0.4 µg g-1 in the leaves and root-rhizomes, respectively, and growing in sediment that did not contain measurable cadmium, concentrated that element principally in the leaves when transferred to seawater containing cadmium at concentrations of up to 1.8 µg I-1. Leaves and root-rhizomes initially containing cadmium at concentrations of 15 and 14 µg g-1, respectively, lost cadmium when transferred to seawater containing cadmium at less than 0.2 µg I-1. Approximately 70% of the cadmium accumulated by leaves of H. tasmanica was associated with solid cellular material, 20% with cell fluids and the remainder was sorbed on the leaf surfaces.
Full text doi:10.1071/MF9820829
© CSIRO 1982