Relationship between the Ocurrence of Birds in Winter and Wooded Streets in a Central Area of Osaka City, Japan

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  • ICHINOSE Tomohiro
    兵庫県立大学自然・環境科学研究所／淡路景観園芸学校

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  • 大阪市中心部の街路樹と越冬期の鳥類の出現状況の関係
  • オオサカシ チュウシンブ ノ ガイロジュ ト エットウキ ノ チョウルイ ノ シュツゲン ジョウキョウ ノ カンケイ

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I investigated birds from 15 January to 24 February 2004 along 8 wooded streets in central area of Osaka, Japan, in order to determine which environmental factors of wooded street are important as habitat of birds in winter. Eight species of 218 individuals were recorded at 2 times observation of the streets. I used a satellite image to identify the distribution of vegetation in my study area. The normalized difference vegetation index (NDVI) of each grid cell was calculated. The value of NDVI that indicated the threshold value for vegetation cover were 0.3 and more, based on the ground-truthing from December 2003 to February 2004. The proportion of vegetation cover within 50 m from a recording point was calculated in each bird species. The average vegetation cover proportion of Hypsipetes amaurotis and Sturnus cineraceus was more than 25 %, while that of Passer montanus was around 5 %. Almost all individuals of species except Passer montanus were significantly recorded in buffer areas within 100 m, 200 m, 300 m and 400 m from the edge of 2 ha and more woodlot.

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