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題 名 | Microhabitat Use by Formosan Landlocked Salmon, Oncorhynchus Masou Formosanus=櫻花鉤吻鮭之微棲地使用 |
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作 者 | 曹先紹; 林曜松; | 書刊名 | 動物研究學刊 |
卷 期 | 37:4 1998.10[民87.10] |
頁 次 | 頁269-281 |
分類號 | 387.105 |
關鍵詞 | 鮭魚; 微棲地; 選擇; 水底觀察; Salmon; Microhabitat; Selection; Underwater observation; |
語 文 | 英文(English) |
中文摘要 | 在七家灣溪內選取四段長度85公尺的溪段,垂直流水方向間隔五公尺設一條穿越 線, 利用浮潛法記錄所觀察到櫻花鉤吻鮭( Oncorhynchus masou formosanus )個體的大 小與行為,隨後並測量水體與鮭魚吻端位置的物理因子,包括水深、流速、底質石粒徑、溪 流內遮蔽物有無等,據此比較不同水溫時期、不同魚體大小、不同行為下,櫻花鉤吻鮭所使 用的微棲地物理因子之特徵。發現浮現初期的仔魚多集中水流速度緩慢與溪流內遮蔽物豐富 的區域; 目測體長超過 5 公分的幼魚則泰半移入水位較深、 水流速較高( 0.1 至 0.86 m/sec )的水域,且對溪流內遮蔽物的依賴程度不高。一齡以上的成魚喜好使用溪水較淺、 水流速較緩(低於 0.2 m/sec )且溪流內遮蔽物豐富的位置休息; 溪水較深、水流速較高 ( 0.6 至 1.1 m/sec )且溪流內遮蔽物缺乏的位置覓食。櫻花鉤吻鮭對生殖棲地的物理因 子亦有極為嚴格的要求,傾向水位較淺( 0.1 至 0.39m )、水流速較緩( 0 至 0.3m/sec )、底質由中小型卵石、礫石所構成的環境。本研究結果顯示,櫻花鉤吻鮭對微棲地的使用 會受溪水水溫、個體大小、及其當時行為之影響而有所差異。 |
英文摘要 | Microhabitat requirements of the Formosan landlocked salmon ( Oncorhynchus masou formosanus) were studied in four 85-m-long sections of the Chichiawan Stream. Underwater observations to locate the salmon, followed by measurements of physical habitat variables, were conducted along transects established at 5-m intervals. Available and occupied habitat units were compared to quantify water depth, current velocity, instream cover, and substrate type of suitable microhabitat. Data were pooled to represent salmon habitat use during 2 water temperature periods. Newly emerged fry extensively used habitats with nearly no current velocity and abundant instream cover. More than 50% of the salmon from 5 to 9 cm moved into deeper water having moderate current (0.1 to 0.86 m/sec) and less instream cover. Adult salmon used slower (less than 0.2 m/sec), shallower sites with abundant instream cover for resting, and fast velocity (0.6 to 1.1 m/sec), deeper sites with less instream cover for feeding. Spawning salmon preferred shallower waters (0.1 to 0.39 m), slower currents (0 to 0.3 m/sec), and small to moderate substrate sizes (<25.6 cm). Microhabitat selection by Formosan landlocked salmon is related to fish size, water temperature, and life history activities. |
本系統中英文摘要資訊取自各篇刊載內容。