Abstract
The diatom Phaeodactylum tricornutum, grown in continuous culture in a cage culture turbidostat, demonstrated an increase in the release of copper-complexing ligands with increased growth rate, and a greater release during active photosynthesis during the day, as compared with release in the dark. Characterization of the organic matter released to the medium using Iatroscan thin-layer chromatography with flame ionization detection showed that the major portion of the copper-complexing ligand could be found in the ‘base-mobile’ fraction. The amounts of ligands released by these organisms were consistent with the ligand concentrations commonly found in seawater.
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