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During a 20 d period in summer 1988, two 30 m3 mesocosms were used to study the effect of nutrient enrichment (NH4+ plus Pod3-) on the short-term (6 h daylight) and diel (day-night) patterns of incorporation of I4C into different cell constituents of the phytoplankton [proteins, polysaccharides. low molar mass compounds (LMC) and lipids] in the northern Baltic. After 6 h incubation, the clearest effect of the nutrient enrichment was an increase in the proportion of the I4C-LMC pool. The nutrient additions led to a decrease in the proportion of I4C-proteins in the whole algal assemblage, while the opposite was true with autotrophic picoplankton. The proportions of '4C-polysaccharides and 14C-lipids seemed to be unaffected by the nutrient enrichment, but a sudden decrease of 5 "C in water temperature temporarily increased the proportion of '4C-polysaccharides by 10 to 20 percentage points. Our results demonstrate that determination of intracellular biochemical '4C-fractions provides ecologically important information about the different metabolic pathways of algal cell constituent synthesis in a fluctuating environment, hence supplementing primary productivity measurements based on total incorporation of I4C.

Effect of nutrient enrichment and temperature or intracellular partitioning of 14C02 in a summer phytoplankton community in the northern Baltic