| 中文摘要 |
本研究選擇源頭與七家灣溪較為接近的雪山溪、白石溪、馬達拉溪及卡社溪等4條高山溪流，深入保有較原始生態環境之河段進行棲地調查評估，為台灣櫻花鉤吻鮭找尋大甲溪上游以外的新家，為未來可能進行的域外放流預作準備。在列入評估的4條溪流中，卡社溪海拔高度1,885-2,050m的調查河段流量變化小，雖歷經颱風、豪雨及921大地震，但河道改變不大，濱溪植物對於水面的覆蓋較為完整，水溫、水質皆佳，水棲昆蟲數量豐富，河道坡度與七家灣溪最為接近且無任何攔砂壩阻隔，流水型態比例亦較其他溪流均勻及穩定，是較適合台灣櫻花鉤吻鮭生存的棲地。
In order to assess the feasibility of the propagation of Oncorhynchus masou formosanus (Jordan & Oshima) outside its present range at Chichiawan Creek, four streams of which altitudes and environmental conditions were fairly similar to those of the Chichiawan Creek were selected for the habitat assessment. They were Kashe Creek, Matala Creek, Paishin Creek and Hsuehshan Creek. For each creek, hydrological and hydraulic conditions, water quality, aquatic insects, and fishes were investigated. The results indicated that the Kashe Creek, a headwater creek of the Choshui River, is favorable for the propagation of 0. masou formosanus. |
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