スギモト タケシ   Sugimoto Takeshi
  杉本 剛
   所属   神奈川大学  工学部 情報システム創成学科
    神奈川大学大学院  工学研究科 工学専攻(情報システム創成領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2012/03
形態種別 その他
標題 The long way round is the short way home: the importance of wind conditions in migration route selection by Grey-faced Buzzards Butastur indicus.
執筆形態 共著
巻・号・頁 Book of Abstracts, 5th International Congress of East Asian Federation of Ecological Societies,p.381頁
著者・共著者 Sugasawa, S., Yamaguchi, N., Sugimoto, T., Higuchi, H.
概要 Migratory birds choose a certain route to their destination from potential routes under different conditions. Wind conditions are ones of the most important factors affecting the choice via costs and risks of migration. This study investigates if the detour by the Grey-faced Buzzard (Butastur indicus) breeding in Japan is adaptive in terms of migration costs and risks. To this end, we simulated flights of individuals along four possible routes using wind data, and calculated costs, defined as time to complete migration, and risks as probabilities not to reach breeding sites before the breeding season. Despite the large difference in distance, the difference in the costs between the detour and the shortest route, which have the lowest costs, was less than 40 hours. Risks did not vary greatly among the routes. Moreover, the detour has another advantage, the larger proportion of distance over land to the entire distance. Based on these facts, the detour seems to be the most adaptive among the four routes. Our approach explicitly accounts for the effect of wind conditions on bird flights. It would allow the more accurate evaluation of costs and risks than one based on distance only, eventually serving to a better understanding of the evolution of migration routes.