Seasonal variation in phytoplankton biomass and production in the vicinity of a Southern Benguela kelp bed is studied in relation to the upwelling cycle. Mean phytoplankton biomass was estimated as 56 mg chl a m -2 and phytoplankton production as 1.13 kg C m-'yr-' The top 10 m of the 20 m deep water column monitored contained 83 % of the b~omass and 76.5% of the production. Daily and seasonal variations in phytoplankton are described.
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