Figure 5.

The uptake rate constants (k_in) for Fe′ and FeDFB uptake by iron-limited cyanobacteria. The data is presented within the bioavailability envelope based on the Fe′ and FeDFB uptake of iron-limited eukaryotic phytoplankton (dashed trend lines). Each data point represents a value taken from a different study. A single point of Fe–schizokinen uptake by Anabaena (starred circle) is included for comparison. The symbols indicate different strains: marine Synechococcus (white triangles), brackish Synechococcus (white squares), Synechocystis (black circles), Prochlorococcus (gray triangles), Trichodesmium (black triangles) and Anabaena (white circles).