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oai:repository.naro.go.jp:02001085 2026-01-30T04:54:01Z 1706970004180:1 87:661:1727312983899:663:1713489132714

谷津田域におけるタモロコの移動と分散―個体識別法による追跡調査― Movement of field gudgeon, Gnathopogon elongatus elongatus, in agricultural canals in Yatsu paddy fields -Investigation using individual-identification method- TAKEMURA, Takeshi 竹村, 武士 タケムラ, タケシ KOIZUMI, Noriyuki 小出水, 規行 コイズミ, ノリユキ OKUSHIMA, Shuji 奥島, 修二 オクシマ, シュウジ YAMAMOTO, Shori 山本, 勝利 ヤマモト, ショウリ 相賀, 啓尚 アイガ, ヒロヒサ AIGA, Hirohisa We monitored marked individuals of filed gudgeon at two agricultural canals in Yatsu paddy fields, Shitada-gawa River, Chiba Prefecture, by using individual-identification method. Our monitoring had been continued from July 2004 to July 2005 at a few weekly intervals after releasing a total of 100 and 140 marked individuals at each target canal. The following results were obtained: 1) after the 20 to 30th from releasing, movement of marked individuals seemed to be stable, and the individuals were similar in distribution at each canal to wild individuals. 2) Movement after the 30 days for nine marked individuals, which were caught more than two times, displayed that average of migration range of those individuals was 100 m (standard deviation, 109m; median 54m; mode, 0m; max 294m). 3) Movement of marked individuals in a few weeks depended on body-size of individuals, and it was suggested that there was strong positive correlation between the migration range and body-size. 独立行政法人農業工学研究所 NATIONAL INSTITUTE FOR RURAL ENGINEERING INDEPENDENT ADMINISTRATIVE INSTITUTION 2006-03-31 jpn departmental bulletin paper https://doi.org/10.24514/0002001085 https://repository.naro.go.jp/records/2001085 10.24514/0002001085 0915-3314 農業工学研究所技報 Technical report of the National Research Institute of Agricultural Engineering 204 33 41 https://repository.naro.go.jp/record/2001085/files/TRNRIAE204_p33-41.pdf application/pdf 441 KB 2024-05-08