Turbid water induces refuge behaviour of a commercially important ayu: a field experiment for inter-stream movement using multiple artificial streams.-論文・刊行物検索

作成年度	2018 年度
論文名	Turbid water induces refuge behaviour of a commercially important ayu: a field experiment for inter-stream movement using multiple artificial streams.
論文名（和訳）
論文副題
発表会
誌名	Ecology of Freshwater Fish
巻・号・回	Vol.27, No.4
発表年月日	2018/06/28

所属研究室／機関名	著者名（英名）
Aqua Restoration Research Center, Public Works Research Institute, Department of General Systems Studies, The University of Tokyo	Mori Terutaka
Aqua Restoration Research Center, Public Works Research Institute, Civil Engineering and Eco‐technology Consultants Co., Ltd.	Kato Yasumitsu
Aqua Restoration Research Center, Public Works Research Institute, OYO Corporation	Tetsuya Takagi
Aqua Restoration Research Center, Public Works Research Institute	Onoda Yukio
Water Environment Research Group, Public Works Research Institute	Kayaba Yuichi

抄録
Riverine systems are inherently dendritic in nature, and turbid water may not necessarily flow equally throughout an entire catchment. Tributaries have the potential to serve as refugia from temporarily turbid water in the main stem. As ayu (Plecoglossus altivelis) are one of the important species for the inland fisheries industry and recreational fishing, their behaviour in a branched river network is a primary concern. We released ayu with radio‐transmitting tags into two experimental streams that joined at a downstream pool. Turbid water was released into one of the streams, and we identified whether avoidance movement of ayu between the two experimental streams was triggered by flowing turbid water. The suspended solid concentration elevated rapidly after adding the turbid water and was maintained at more than 400 mg/L for 3 hr. Avoidance movement of ayu was triggered when the suspended solid concentration exceeded approximately 200 mg/L. Then, most ayu moved from the turbid stream to the nonturbid one, leading to a difference in ayu density between the two streams. Therefore, we demonstrated that turbid water induced interstream movement of a commercially important ayu as refuge behaviour, suggesting that river connectivity is important for the persistence of the ayu.

抄録

Riverine systems are inherently dendritic in nature, and turbid water may not necessarily flow equally throughout an entire catchment. Tributaries have the potential to serve as refugia from temporarily turbid water in the main stem. As ayu (Plecoglossus altivelis) are one of the important species for the inland fisheries industry and recreational fishing, their behaviour in a branched river network is a primary concern. We released ayu with radio‐transmitting tags into two experimental streams that joined at a downstream pool. Turbid water was released into one of the streams, and we identified whether avoidance movement of ayu between the two experimental streams was triggered by flowing turbid water. The suspended solid concentration elevated rapidly after adding the turbid water and was maintained at more than 400 mg/L for 3 hr. Avoidance movement of ayu was triggered when the suspended solid concentration exceeded approximately 200 mg/L. Then, most ayu moved from the turbid stream to the nonturbid one, leading to a difference in ayu density between the two streams. Therefore, we demonstrated that turbid water induced interstream movement of a commercially important ayu as refuge behaviour, suggesting that river connectivity is important for the persistence of the ayu.

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詳細情報

論文投稿　Turbid water induces refuge behaviour of a commercially important ayu: a field experiment for inter-stream movement using multiple artificial streams.

論文・刊行物検索

詳細情報

論文投稿 Turbid water induces refuge behaviour of a commercially important ayu: a field experiment for inter-stream movement using multiple artificial streams.

論文投稿　Turbid water induces refuge behaviour of a commercially important ayu: a field experiment for inter-stream movement using multiple artificial streams.