Abstract
Influence of allelochemicals from submergent plants for population dynamics of Daphnia were investigated. We checked rate of hatching out from resting eggs of Daphnia and transition of biota of planktonic microorganisms including Daphnia by using filtrated water from cultivation tank of submergent plant. Potamogeton dentatus, P. × inbaensis, P. perfoliatus and P. maackianus activated not only rate of hatching out from resting eggs but density of Daphnia. The other hands, Myriophyllum spicatum, Potamogeton pectinatus, P. oxyphyllus, Najas oguraensis and Utricularia vulgaris var. japonica inhivited population.of Daphnia. These results suggest us that allelochemicals from submergent plants will play an important role for decision of planktonic biota in natural water conditions.
