Requirements for small agricultural dams to allow the Japanese giant salamander (<i>Andrias japonicus</i>) to move upstream

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  • Taguchi Yuki
    Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University:(Present office)Graduate School of Global Environmental Studies, Kyoto University:(Present office)The Museum of Nature and Human Activities, Hyogo
  • Natuhara Yosihiro
    Kyoto University Graduate School of Global Environmental Studies

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  • オオサンショウウオが遡上可能な堰の条件
  • オオサンショウウオ ガ ソジョウ カノウ ナ セキ ノ ジョウケン

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The stream habitats of the Japanese giant salamander (Andrias japonicus) are becoming increasingly segmented and isolated by small agricultural dams and sand control dams. The goals of this study were to ascertain the inhibition of upstream movement of A. japonicus by small agricultural dams and to determine which conditions enable A. japonicus to move upstream over the dams. We tracked 104 individuals using a mark-recapture study over 1533m of the Hatsuka River in Hyogo Prefecture from July 2004 to December 2005. More than 10 individuals moved upstream of each dam, but the majority of individuals occurred downstream of the dams. Density ratios (density within 10m downstream of the dam/density in remaining 1473m) peaked in July 2004 (67.5) and in August 2005 (71.4). These peaks coincided with the migration season of A. japonicus, indicating that upstream movement of individuals was inhibited by the dams. Individuals tended to accumulate at the lower sides of dams that were higher than 80cm and lacked a gently-sloped detour. However, our observations suggest that if these dams were equipped with either asperities to facilitate a toehold or gently-sloped detours, A. japonicus could traverse these barriers.

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