LIFE-CYCLE AND REPRODUCTION OF THE DINOFLAGELLATE DINOPHYSIS-NORVEGICA

Developmental stages resulting from inoculation of isolates and concen trates of toxigenic Dinophysis norvegica are described. Similarities e xist in the developmental stages of D. acuminata, D, acuta, D, pavilla rdi and D. norvegica. Physical oceanographic mechanisms explain only t he distribution of the cells in a red tide resulting from Dinophysis, but not the biomass. However, sexual reproduction as a prerequisite ca n account for the abundance of cells and therefore the formation of th e red tide.