... anti-cyanobacterial compounds from vegetation in artificial floating islands, and such allelopathic vegetation may be used in artificial floating islands for effective cyanobacterial control, as well ... MATERIALS AND METHODS Plants and cyanobacterium Commercially obtained umbrella plant (Cyperus alternifolius) and Canna (Canna generalis) were used for testing, because the artificial floating islands ... removing nutrients, and restoring the aquatic ecosystems. The artificial floating islands with vegetation have been applied to many lakes, ponds, and dams (Hoeger, 1988; Nakamura and Shimatani,...