An overfishing-induced trophic cascade led to decimation of WFS zooplankton, with a subsequent increment of bacteria-mediated export of sea spray-entrained, wind-borne HAB aerosols to adjacent humans, comprising 48% of the annual net primary production of minimally-grazed HABs.

Unusually strong upwelled nutrient supplies for otherwise Si-limited diatoms, with less susceptibility to oil poisons, allowed these retrograde diatom competitors to win against HABs during the Deepwater Horizon oil spills.

Return of usual oligotrophy led to reoccurrence once more of HAB fish killers and human asthma triggers.