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Percentage of total P. globosa cells within colonies after incubations with chemical cues from grazer-free (open bars) or grazer-containing P. globosa cultures (filled bars). Grazers were either a natural mixture of mesozooplankton (collected in plankton tows in coastal Georgia) (a), the copepod A. tonsa alone (b), or the ciliate Euplotes sp. alone (c). P values designate differences between treatments (ANOVA). Values are means ± 1 SEM.
