In the stratified water, however, this assemblage occurred in the moderately eutrophic middle photic zone. The Florisphaera abundant assemblage, which is characterised by the common occurrence of F. profunda and G. flabellatus , was restricted to the lower photic zone. Horizontal and vertical distributions of assemblages were controlled by temperature and nutrient concentration. In the stratified oligotrophic stations, assemblages that require high nutrient-concentrations were constrained in the moderately eutrophic middle photic zone.
Floral stratification is more complex in the stratified waters rather than in the dynamic waters.