著者

水口 仁人 福井 亘 宮本 脩詩 髙林 裕

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究(オンライン論文集) (ISSN:1883261X)

巻号頁・発行日

vol.13, pp.20-23, 2020-06-24 (Released:2020-08-06)

参考文献数

24

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Communal roosts of birds formed on the street trees are problems in many cities, but no drastic solution has been found. Therefore, it is considered necessary to clarify the current situation of communal roosts from quantitative investigations and to accumulate knowledge of communal roosts formed on the street trees. The purpose of this study was to investigate the communal roosts on street trees of Kyoto city as an example, and to grasp the current situation. A research site was selected from places where Passer montanus and Spodiopsar cineraceus roosting in Kyoto. The survey was conducted once a week between June 13 and November 4, 2018, recording the number of roosting individuals, the time of roost initiation and completion, and roosting status. As a result, it became clear that a population roost will be formed until October. Furthermore, it was found that the population of P. montanus and S. cineraceus forming the communal roost increased during June. In addition, the initiation and completion times of roosting are close to the changes in sunset time, and it is considered that the sunset time is one of the factors affecting the roosting time. And, it was thought that there could be trees that are favored as roosts.

著者

髙林 裕 福井 亘

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究 (ISSN:13408984)

巻号頁・発行日

vol.83, no.5, pp.749-752, 2020-03-30 (Released:2020-06-09)

参考文献数

28

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Avifauna in urban matrix may be influenced by forests and farmlands surrounded by the matrix. How does the matrix in the city center with few forests and farmlands work for birds? The purpose of this study was to clarify the effect of the green coverage ratio in the matrix of the city center on the birds appearing in small urban parks. We selected 29 urban parks ( area : 2561.21±371.97 ㎡ ) in the center of the Osaka City as study sites. Each site was visited three times for bird surveys in each of breeding and wintering seasons. Using the satellite images taken by Sentinel-2, we calculated the green coverage ratio around 29 urban parks. Moreover, we clarified the relationship between the appearing birds and the green coverage ratio in the matrix based on the hierarchical Bayesian model. As a result, the presence of large habitat patch in the urban matrix affected the appearance probability of some species. Furthermore, the result also showed that the green coverage ratio in the matrix during the wintering season influenced the probability of appearance of Hypsipetes amaurotis and Turdus pallidus which have features about eating fruits.