Abstract

Using well plates of Phaeocystis pouchetii colonies isolated from experimental mesocosms in western Norway, increases in colony size and division were documented. Median, longest linear dimensions increased 0-7 μm h -1 ; literature Phamcystis globosa values are 0.9-4.7 μm h -1 . Ten to twelve percent of colonies divided at rates of 0.21-0.28 divisions day -1 . Daughter colonies were 100 μm smaller than mother colonies. Colonies delayed 3.5-4.9 days to first division, compared with literature values of 4-5 days for P. globosa. This study provides the first experimental evidence for colony division of wild P. pouchetii.

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