Fig. 1.

Sites of five major ocean research cruises from which samples were obtained for measurements of domoic acid (DA) and/or Pseudo-nitzschia abundance. Samples from GOA-Gulf of Alaska (2007), VERTIGO K2 (2005), and VERTIGO ALOHA (2004) represent natural oceanic waters (i.e., seaward of the continental shelf in ≥200m of water), whereas SOFeX (2002) and IronEx II (1996) samples were obtained from blooms promoted by the artificial addition of Fe, also in deep water (≥1,000m) oceanic regions. The number of stations sampled at each site is given in parentheses. See Table S1 for station locations, geographic descriptions, DA concentrations in cells and water, and Pseudo-nitzschia abundances.