Abstract
Butterfly communities were studied in four urban housing complexes: Satsukigaoka-danchi (Satsukigaoka), Higashitoyonaka-daiichi-danchi (Higashitoyonaka), Asahigaoka-danchi (Asahigaoka), and Kori-danchi (Kori), in northern Osaka in 1998. The numbers of species and densities (km-1) ranged from 16-25 and 14.1-24.6, respectively. The most abundant species was Pseudozizeeria maha in 3 sites, and Pieris rapae in Kori. Rebuilding of a housing complex led to the reduction of species and density. For example, densities in new building areas were 0.3-0.4 times those in old ones. This reduction is considered to be due to the loss of the grass around buildings.
