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Colonies of the alga Phaeocystispouchetj~ (average colony diameter ca 4 mm) were subjected to light/dark periods in culture, and production and consumption of macromolecules of the colony matrix were measured. In the light, up to ca 32 % of the total photosynthetic carbon fixation, consisting mostly of large-molecular-weight products (MW > 1800), were accumulated in the colonial matrix. In the dark, these macromolecular compounds disappeared, whereas monomeric and oligomeric compounds were found, suggesting reassimilation of colonial substances by P. pouchetii cells. Stepw~se filtration allowed separate analysis of cells, colonial matrix and surrounding medium. The latter 2 compartments differed widely in size spectra of organic compounds (as determined by gel-permeation) and in fluctuations over a light/dark cycle, suggesting that the very high rates of carbon excretion during P. pouchetii blooms in previous reports should be reconsidered.

Transfer of photosynthetic products in gelatinous colonies of Phaeocystis pouchetii (Haptophyceae) and its effect on the measurement of excretion rate