Iron and manganese co-limit growth of the Southern Ocean diatom Chaetoceros debilis
Fig 1
The dark-acclimated maximum PSII quantum yield Fv/Fm (A) and the dark-adapted functional absorption cross section of PSII photochemistry σPSII (B) of C. debilis grown in naturally FeMn-poor Antarctic seawater (-FeMn) and to which additions of either Mn alone (-Fe), Fe alone (-Mn) or both (control) were given. Values represent the means ± SD (n = 3). Different letters indicate significant differences between treatments (p < 0.05).