Abstract
A significant proportion of the total primary production in the Celtic Sea (50°30′N; 07°00′W) has been found to be due to picoplankton and small nanoplankton. In July, August and October, 1982, 20 to 25% of the 14C fixed in primary production was in organisms >5 μm, 35 to 40% was in organisms 0.2 μm fraction; therefore, production in the 0.2 μm fraction was the result of photosynthesis per se by picoplankton and could not have been due to heterotrophic bacteria utilizing exudates from larger phytoplankton. Time-course experiments demonstrated some transfer of label from the 0.2μm fraction to the >5 μm fraction, presumably by grazing, but again most of the production in this fraction was the result of photosynthesis by organisms larger than 5 μm and was not due to grazing by heterotrophic microflagellates on smaller phytoplankton.
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