Factors limiting phytoplankton production in a nearshore upwelling area

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Abstract
Phytoplankton productivity was investigated at two nearshore sites in the southern Benguela region during the upwelling season. Changes in biomass and production are discussed in relation to the physical and chemical Status of the water column. It is suggested that, although light and nutrients affect the production and biomass of phytoplankton, low phytoplankton biomass in upwelling water, coupled with the frequency of upwelling, plays a more important role in the overall productivity of the nearshore coastal zone of upwelling regions where the source water is poor in chlorophyll a .

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