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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 12 | PAGES 2349-2366 | 1996
© Oxford University Press

research-article

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

E. Fernández1, E. Marañón2, D. S. Harbour3, S. Kristiansen4 and B. R. Heimdal5

1Departamento de Recursos Naturais e Medio Ambiente, Universidade de Vigo Campus Lagoas-Marcosende, E-36200 Vigo 2Departamento de Biologia de Organismos y Sistemas; Universidad de Oviedo E-33071 Oviedo, Spain 3Plymouth Marine Laboratory Prospect Place, West Hoe Plymouth PL1 3DH, UK 4Department of Biology, Marine Botany, University of Oslo PO Box 1069 Blindern, N-0316 Oslo 5Department of Fisheries and Marine Biology, Bergen High Technology Center, University of Bergen N-5020 Bergen, Norway

Received on March 15, 1994; accepted on July 29, 1996 Blooms of the coccolithophorid Emiliania huxleyi were monitored in two land-locked fjords, Fauskangerpollen and Nordåsvannet (Western Norway), in May 1993. The chemical composition of particulate 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 microplankton growth was supplied by aminonium and dissolved organic compounds such as urea and, as a consequence, 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 C/nitrogen 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 chemical composition of particulate matter.


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