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. 2010 Mar 15;107(13):5887–5892. doi: 10.1073/pnas.0910579107

Table 1.

Comparison of the present, deck-board Fe-enrichment experiments with previous open-ocean mesoscale Fe enrichment experiments

HNLC Region Project Year Dominant phytoplankton within bloom Initial Chl a (μg L−1) Peak Chl a (μg L−1) Refs.
Equatorial Pacific
 IronEx-I 1933 Synechococcus red-fluorescing picoplankton autotrophic dinoflagellates 0.24 >0.65 37, 38
 IronEx-II 1995 Pseudonitzschia spp. (Initially reported as Nitzschia) 0.15–0.20 <4.0 6, 7, 39
Northwest Pacific
 SEEDS-I 2001 Chaetoceros debilis 0.8–0.9 21.8 40, 41
 SEEDS-II 2004 Pseudonitzschia spp., Neodenticula semina 0.80 2.48 42
Northeast Pacific
 SERIES 2002 Pseudonitzschia spp., Neodenticula semina, Chaetoceros spp. 0.27–0.43 6.30 43, 44
 PAPA-SEEDS 2006 Pseudonitzschia turgidula 0.2–0.3 Present study
Southern Ocean
 SOIREE (Australian polar waters) 1999 Fragillariopsis kerguelensis, Rhizosolenia spp., Pseudonitzschia sp. 0.25 3.0 8, 45
 EisenEx (Atlantic polar waters) 2000 Pseudonitzschia lineola 0.48–0.56 2.80 9, 15
 SOFeX – North (Pacific subpolar waters) 2002 Pseudonitzschia spp. 0.26 2.60 10, 11
 SOFeX – South (Pacific polar waters) 2002 Fragillariopsis spp., Corethron spp., Chaetoceros spp., Rhizosolenia spp. 0.20 4.0 10, 11
 EIFEX (Atlantic subpolar waters) 2004 Chaetoceros spp., Fragilariopsis kerguelensis, Pseudonitzschia spp., large single-celled diatoms 0.54 2.85 46, 47
 SAGE (Pacific subpolar Si-depleted coastal waters) 2004 ~0.6–0.4 1.3 > 0.7 2, 48

The present, deck-board Fe-enrichment experiment was compared with previous open-ocean mesoscale Fe enrichment experiments conducted in HNLC regions of the Equatorial and North Pacific Oceans, and Southern Oceans with respect to initial and peak biomass [as chlorophyll a (Chl a)], and the dominant phytoplankton species or genera that increased in response to alleviation of in situ Fe-deficient conditions.