“Organisms as diverse as phytoplankton, corals, crabs and molluscs lay down limestone or calcium carbonate skeletons.”

“Many productive commercial fishing areas depend on phytoplankton nurtured by the seaward flow of clearer water, which in turn nurtures the fish.”

“Since silica can only limit diatoms, other forms of phytoplankton might dominate if nitrogen is regenerated more rapidly.”