||Surface waters where rapid growth and very high densities of diatoms occur. Diatoms are large cells and tend to have high
nutrient requirements. Spring diatom blooms occur in many estuarine and coastal waters, as diatoms have low light requirements
and are well adapted to the hydrologic period when turbid riverine inputs are highest. They have higher nutrient requirements
than other groups and require silica, needed to produce frustules. Land runoff contains silica making the spring period ideal
for formation of coastal diatom blooms. The rise of the bloom is important in initiating food webs of zooplankton and other
grazers and the decay of the bloom is important in nutrient cycling, and potentially contributes to the later formation of
hypoxic bottom water as organic material accumulates in the lower water column.