The common reed (Phragmites communis) appeared all along the Danube River and was dominant in places where the river had great widths and several islands. Overall, reed is more common in areas with stagnant or low flowing waterbodies, swamps, flood plains, channels and puddles. It appears both in aquatic as well as in teresstrial ecosystems. The distribution is mainly water-born. Anthropogenic influence on distribution is little.