Figure 4.

Log cell numbers per ml of P. tricornutum NRKO (A,B) and A. macleodii WT bacteria (C,D) in co-culture, grown on ${\text{NH}}_4^{+}$ or ${\text{NO}}_3^{-}$ and as the sole nitrogen source. Green markers = P. tricornutum NRKO monoculture (also noted as D only), blue = P. tricornutum NRKO + A. macleodii WT (also noted as D + WT), and gray = P. tricornutum NRKO + A. macleodii WT + DOC (also noted as D + WT + DOC).