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Urban Ecological Network-Ecological Corridor function of the greenery in a city-

by Takuro Odawara，Yutaka Hayashi，Sotaro Yonemura and Shinya Nishio

Recently, cities have been promoting the planting of trees. However, little wildlife inhabits these areas of greenery, and the few species that do are few in number. Bio-corridors of trees provide wildlife with paths into areas of urban greenery. For these bio-corridors and areas of urban greenery to become an effective ecological network, however, people need to know about them. Therefore, in a large-scale institution construction or urban redevelopment, consideration to an ecosystem network and greening become essential. Until now, the function and value of these urban ecological networks have not been verified. In order to acquire fundamental knowledge that can be used when planning ecological networks, the authors investigated how butterflies and wild birds use bio-corridors. The investigation showed that butterflies and wild birds need uninterrupted paths of greenery for their movements. An experiment with butterflies revealed that their movements have a height component that is provided by continuous corridors of greenery. The results of this study show that urban ecosystems are effective when linked by bio-corridors of uninterrupted greenery. Moreover, these bio-corridors can help revive and maintain a city's urban ecosystem. The study also showed that rooftop biotopes are effective habitats for certain species when linked to a bio-corridor that provides the height component needed by certain species.