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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 3 | PAGES 517-537 | 1998
© Oxford University Press
research-article |
Development of the diatom-Phaeocystis spring bloom in the Dutch coastal zone of the North Sea: the silicon depletion versus the daily irradiance threshold hypothesis
National Institute for Coastal and Marine Management/RIKZ PO Box 8039, NL-4330 EA Middelburg, The Netherlands 1Forschungs- und Technologie Zentrum Westküste, Hafentörn D 25761 Büsum, Germany 2Department of Marine Biology, University of Groningen PO Box 14, NL-9 750 AA Haren, The Netherlands
Received on July 17, 1997; accepted on November 6, 1997 The Dutch coastal zone of the North Sea is characterized by high nutrient inputs and low water column irradiance due to high concentrations of suspended matter. The vernal phytoplankton blooms are dominated by diatoms and the flagellate Phaeocystis (Haptophyta). Two hypotheses that predict the timing of the Phaeocystzs bloom were tested with field data collected in 1992. The first one, stating that the Phaeocystis bloom starts when silicon has been depleted by a preceding diatom bloom, could not be bracketed with observations. The second hypothesis, predicting that Phaeocysus blooms under nitrogen- and phosphorus-replete conditions after a daily irradiance threshold has been passed could be supported by field observations. Furthermore, it is shown that the Dutch coastal zone is not continuously homogeneously mixed. It is argued that this is an important factor in the life cycle of Phaeocystis and in foam formation on nearby shores. Grazing by the ciliate Strombidium sulcatum and heterotrophic gymnodinoid flagellates accounted for 92% of Phaeocystis cell loss after the bloom.
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