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The Influence of Current Direction on Longshore Distribution of Surf Phytoplankton

Investigations into the distribution of the surf diatom, Anaulus biroslratus (Grün.) Grün., have shown that they are confined to the surf-zone and immediate nearshore. Few cells have been found to cross the seaward boundary of the surf-zone, with the result that the system was considered almost closed. This study has shown that losses in phytoplankton can occur at the lateral boundaries of the system which is where the maximum in phytoplankton biomass often occurs. These lateral boundaries are dictated by land-form surf phytoplankton move toward the boundary with longshore water currents which cause particular distribution patterns. Longshore flowing water containing no A. biros tratus cells moves into the surf-zone at one end while A. birostratus-nch surf-zone water moves out of the system at the other end. The ecosystem is therefore not closed as was previously suggested, but can potentially export significant quantities of phytoplankton.