“A scientific critique of oceanic iron fertilization as a climate change mitigation strategy”. Greenpeace Research Laboratories. September 2007 – Ecological Concerns Results of mesoscale iron enrichment studies have generally shown that, after iron is added to HNLC waters, the initially predominant smaller phytoplanktonic species increase their growth rate. However, their growth soon becomes checked by the microzooplankton that consume them. The larger phytoplanktonic diatoms are initially low in abundance in the phytoplankton community but, upon the addition of iron, their growth rate also increases. However, unlike the smaller phytoplanktonic species, the diatoms bloom because they largely escape the grazing pressure of the mesozooplankton that
consume them and whose rate of replication is too slow to keep pace.