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Studies of vertical profiles of phytoplankton in the field combined with laboratory experiments demonstrated that reduction in phytoplankton concentrations in the near-bottom water layer, 5 to 10 cm in thickness on calm days, may play a significant role for the filter-feeding polychaete Nereis diversicolorin realizing its grazing capacity (estimated a t 13.8 m3 m-' d-l in the shallow bay of Kertinge Nor, Denmark, in July 1994). Field-growth experiments were performed with worms transferred to U-shaped glass tubes placed at different heights (0, 4 , 10 and 20 cm) above the seafloor. A considerably reduced specific growth rate of worms at the sea floor (0.2 * 1.1 'L d-l), compared to worms elevated just 10 cm above the sediment surface (2.5 k 0.8'Y" d.'), indicdtes that extremely meagre food cond~tions may be prevailing a t the bottom. Experimental laboratory data on the development of vertical algal cell profiles were compared with predicted values obtained by means of a simple diffusion model.

Phytoplankton reduction in near-bottom water caused by filter-feeding Nereis diversicolor - implications for worm growth and population grazing impact