Abstract
During the summer of 1984, moths were collected quantatively with an electrode-type light trap at two stations in the fields and forested areas scattered among the residential areas of Hiratuka City. In July, the numbers of individuals and species, dry weights and diversity indeces were greater at St. A, near the forested areas, than at St. B, around the field and residential areas. The community structures were also seen to be different at St. A, when the same sampling was carried out for a time in August. The numbers of species and individuals and dry weights had increased significantly by the time of the August sampling.
The results were compared to those of a study using the same methods and carried out in the Tama River basin in July, 1977. The numbers of species and individuals, and diversity indeces were greatest in the developed secondary forest in Hino City. The secondary forest in Kawasaki City, which is surrounded by suburban areas, showed a community structure more diversified than that of St. 8, but less deversified than St. A.
Cluster analysis constructed by the species compositions indicated that moth communitieswere classified first on the basis of areas between the Tama River basin and Hiratuka City. However, the difference in sampling times was more important for samples taken at Hiratuka. The relationship between larval food utilization and species composition of moth communities was also discussed.
