大都市圏の河川とその周辺域における越冬期の鳥類に影響する環境要因

抄録

Biodiversity conservation in urban areas is one of the key task for landscape and urban planning. The concept of ‘compact city’ provides new possibilities for creating open spaces which can be habitats for many species in urban areas. The purpose of this study is to clarify the environmental factors influencing populations of wintering birds in metropolitan riparian area and its surroundings to obtain useful guidelines for enhancing urban biodiversity. We surveyed populations of birds and land covers along the river called Okawa in Osaka prefecture in winter 2016. To find the environmental factors influencing populations of birds, we used the Generalized Liner Mixed Model (GLMM). As a result, Passer montanus, Columba livia, Hypsipetes amaurotis, Spodiopsar cineraceus, Turdus naumanni, and Motacilla alba adapted to the metropolitan riparian area. Through this study, we got two results for urban biodiversity. 1) The presence of high trees, non-pavement open spaces, curved water edge and concrete banks along the river, influenced some bird’s populations with the distance from the nearest other rivers or forests. 2) Though a lot of species avoided buildings or pavement open spaces, some species like Corvus macrorhynchos, Phoenicurus auroreus and Motacilla alba, used these areas.