2003 Volume 29 Issue 1 Pages 3-8
The internal distribution of the vulnerable species Ludwigia peploidae ssp. stipulacea was investigated. The internal habitats of this species were recognized only twelve sites in 4 prefectures. On the characteristic of this species habitat, it was dominated by agricultural land use for paddy field cultivation, such as an abandoned paddy field, a ditch, a levee, a small reservoir, etc. The internal total aerial extent of Ludwigia peploidae ssp. stipulacea was 2,160 square maters. And 73% of its biomass was included in Chiba prefecture. Three habitats existed in a permanent water body, which was regarded as a location of a gentle disturbance. It was suggested that its community had been maintained by lengthening a leaf into the water body in order to avoid competition with other tall grass.
