Abstract

Particle uptake by two strains of the freshwater phytoflagellate Dinobryon was studied using cells grown in clonal batch cultures and presented with fluorescent microspheres. Clearance rates were found to be strongly dependent on temperature, with maximum clearance rate observed at around 20°C. Clearance rate over the diurnal light dark cycle was observed to be slightly higher during the dark phase. Cultures quickly died when placed in total darkness. cells of one strain grown for two weeks under dim irradiance (18 μEm -2 s -1 ) showed reduced clearance rates. For the other strain no relation was observed between clearance rate and irradiance

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