A multidisciplinary study of iron transport and storage in the marine green alga Tetraselmis suecica

► Iron is taken up by Tetraselmis in a time and concentration dependent manner. ► Inhibitor and other studies suggest an reductive-oxidative pathway is likely. ► Mössbauer and XAS identify three metabolites after long term exposure to 57Fe. ► A polymeric iron-oxo mineral species accounts for 85% of the pool.