Abstract
The purposes of this study was to clarify the influence of vegetation structure on avifauna during the breeding season in Nanasawa forest park (64.6ha) located in the suburbs of Tanzawa, Kanagawa Prefecture. The investigation, was done on vegetation and avifauna at twelve different study sites. Avifauna was censused during the breeding season in 1999. For vegetation investigation we examined the woods structure, especially layer structure.
As a results, we concluded that the grass layers influence increased the number of birds. Also that avifauna was differed by the difference in vegetation structure. Avifauna's diversity was under the influence of the shrub layer density and the relationship between the vegetation structure.
