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Journal of Plankton Research Vol.22 no.1 pp.107-120, 2000
© Oxford University Press 2000

Growth and mortality of flagellates and non-flagellate cells of Phaeocystis globosa (Prymnesiophyceae)

L. Peperzak, R.N.M. Duin, F. Colijn1 and W.W.C. Gieskes2

National Institute for Coastal and Marine Management/RIKZ, PO Box 8039, NL-4330 EA Middelburg, The Netherlands, 1 Forschungs- und Technologie-Zentrum Westküste, Hafentörn, D 25761 Büsum, Germany and 2 University of Groningen, Department of Marine Biology, PO Box 14, NL-9750 AA Haren, The Netherlands

Two cell types of the same clone of Phaeocystis globosa, solitary non-flagellate cells and flagellates, were grown in batch cultures under identical conditions. The non-flagellate cells had a shorter lag phase (1.4 versus 2.8 days) and a higher growth rate (0.72 versus 0.65 day–1) than flagellate cells. The flagellates had a longer stationary phase (15.6 versus 9.5 days) and a lower death rate (0.07 versus 0.52 day–1) than non-flagellate cells. All differences were statistically significant. Biomass yield did not differ between the two cell types. The short lag phase and high growth rate of nonflagellate cells corresponds to field observations of rapidly developing non-flagellate Phaeocystis blooms that are typically observed in nutrient-rich environments such as temperate seas in spring. The flagellate cell type, with its longer stationary phase and lower death rate than non-flagellate cells, is better equipped for survival in oligotrophic environments. This explains why the flagellates of Phaeocystis are abundant after the spring phytoplankton bloom in temperate seas and in other nutrient-poor environments such as the open ocean.


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