The conceptual model for phytoplankton dynamics in SF Bay points to light, not nutrients, as the dominant factor controlling phytoplankton production, given the high nutrient concentrations present year-round and variable sediment concentrations that limit light penetration into the water column. In the deep channel, phytoplankton biomass generally remains low year-round, except during relatively short-lived stratification events that allow suspension of phytoplankton near the surface.
