Evaluation of biotope connectivity and planning of ecological network in urban landscape.

This study is to evaluate and plan ecological network of waters and greenspaces in urban landscape. The dragonfly, which is closely connected with Japanese culture and familiar naturescape, is chosen as indicator. For this purpose, firstly, the impact of biotope connectivity on species richness is estimated, in which several connectivity index are compared. Secondly, the relationship between occurrence probability of individual species as well as species richness and biotope factors-pond area, pond connectivity, greenspace connectivity-is investigated using multiple regression analysis, and species richness of each biotope is predicted. Thirdly, biotopes are classified on the basis of criteria for selecting ecological network elements-core area, nature development area, corridor-by rating assessment. Furthermore, the effects of biotope creation, that is the creation of 1 ha pond in open space of seven public facilities, for the development of ecological network is predicted.From this study, it is expected that more robust models to evaluate landscape planning scenarios for biodiversity conservation will be constructed and guidelines for the design of dragonfly biotope network including ecologically sustainable land-use system be developed.