抄録
This study focused on habitat area, dIIC as a method for evaluating the biodiversity conservation function of urban green spaces, and examined the possibility of using each index by clarifying the relationship with the actual habitat status of birds. The habitat status of birds was determined using the results of a survey conducted by the National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism, targeting parks and green spaces in Tokyo (survey results from spring to early summer, which is the breeding season for many birds). The distribution data of forests used in the functional evaluation was obtained from JAXA's high-resolution land use and land cover map. As a result of the study, in the evaluation using habitat area as an index, the occurrence rate of Japanese Pygmy Woodpeckers in forests of 2.0 ha or more was 80% or more, and a clear difference in occurrence rate was confirmed compared to forests of less than 0.2 ha, so it was considered possible to set the threshold for suitable habitats for Japanese Pygmy Woodpeckers at 2.0 ha. In the evaluation using dIIC as an index, the relationship between dIIC analyzed at a threshold distance of 500 m and the number of Japanese Pygmy Woodpeckers showed a strong positive correlation, but the confidence interval of the coefficient was wider than others.
