Vegetation on the Artificial Floating Island in Dam Lake

We monitored the plant growth in two artificially vegitated floating islands on a dam lake in the mountain area of Kanto plain, Tochigi, Central Japan. We also monitored the vegitation around the dam lake to compare that with the vegitation on the island. The group of plants that invaded the floating island were mostly those that were also seen in the lake shore area between the minimum and maximum water level. Is was suggested that the floating island with much more moist water condition would be prefferable to establish a rich aquatic plant community on the island.