Fig. 4.
Particulate and cellular DA concentrations in deck-board continuous cultures containing P. cf granii. Basal growth media for the continuous cultures was OSP seawater collected using trace metal–clean techniques. Treatments were: not amended with metals (control) or amended with iron (1 nM Fe). Culture dilution rates were maintained at 0.5 d−1. Particulate DA and P. cf granii abundances were determined after 9 d of incubation. Open and solid bars are particulate DA (pDA) and cellular DA (pDA normalized to Pseudonitzschia cell abundance) concentrations, respectively. The volume adjusted MDL for analysis of pDA is 37 pg L−1.