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Steady state response of phytoplankton under iron (Fe) and light (photosynthetic available radiation) colimitation (a–c) and bacteria under Fe and dissolved organic carbon (DOC) colimitation (d–f) in the absence of competitive interactions. Changes in carbon biomass (a and d), cellular Fe quota (b and e), and growth rate (c and f). Note that the response of Fe:C ratios (e) in the 5 µM DOC, 0.5 nM Fe (dotted line) treatment is hidden behind the 5 µM DOC, 1.0 nM Fe (dot dash) treatment.
