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Blooms of the coccolithophorid Emiliania huxleyi were monitored in two land-locked fjords, Fauskangerpollen and Nordasvannet (Western Norway), in May 1993. The chemical composi- tion of participate matter, size-fractionated photosynthesis , calcification, nitrogen uptake rates and the patterns of macromolecular synthesis were examined during the peak and decline of E. huxleyi blooms. The temporal evolution of the bloom in Fauskangerpollen was defined by a gradual decrease in cell abundance and cell-specific calcification rates, and by increasing numbers of empty coccospheres and the ratio detached coccoliths/living cells. A large proportion of the nitrogen required for microplank- ton growth was supplied by ammonium and dissolved organic compounds such as urea and, as a con- sequence, the f-ratios were low (-0.2). In general, nitrogen uptake patterns were consistent with ambient concentrations of nitrogenous species. The photosynthetic carbon metabolism of E.huxleyi- dominated phytoplankton assemblages was characterized by high carbon allocation into lipids and relatively low carbon incorporation into protein as compared with diatom-dominated assemblages. Consequently, the organic Gnitrogen uptake ratio determined stoichiometrically was significantly higher (up to 10.8) when coccolithophorids were dominant than in diatom-based or mixed-phyto- plankton assemblages. These carbon incorporation patterns were reflected in differences in the chemi- cal composition of paniculate matter.

Patterns of carbon and nitrogen uptake during blooms of Emiliania huxleyi in two Norwegian fjords