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Spacial Distribution and Diel Periodicity of Anaulus birostratus Grunow in the Surf Zone of a Sandy Beach in Algoa Bay, South Africa

Samples of Anaulus birostratus were collected from the surf zone of an exposed sandy beach in Algoa Bay, South Africa. A series of samples were taken, through a bloom and the areas adjacent to it, at four depths during the day (12h 00) and at two depths at night (21h 00). On a second occasion a series of samples were taken through a bloom at three hour intervals over 24 h. The data show that cells of A. birostratus were present in higher concentrations at the surface than in the rest of the water column during the day. They disappeared almost entirely from the surface and decreased in the rest of the shallow water column at night. Cells present in the surface layer of water during the day become concentrated over the rip currents of the surf System to form distinct, dark brown patches of phytoplankton. An hypothesis for bloom formation in the surf zone during the day is proposed.