Measured <i>Eucampia antarctica</i> and <i>Proboscia inermis</i> growth parameters (cell number, chlorophyll <i>a</i>, particulate organic carbon [POC] and nutrient uptake) under different conditions (control, + EDC dust, +FeCl₃).

Mean values are shown, calculated from 5 replicate bottles, ±1 SD. Initial chlorophyll a concentration was calculated from a single dilution of initial cell cultures. Nutrient uptake was calculated from the reduction in nutrient concentration in solution from beginning to end of experiment. Statistical difference from the control was tested with Analysis of Variance (ANOVA; see Methods), and p values and Least Significant Difference (LSD) are shown.