頁籤選單縮合
題 名 | Do Hydrographic Features Limit the Distribution of Ichthyoplankton?A Case Study=水文現象是否會限制表層浮游魚類的分布?個案研究 |
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作 者 | 葉信平; | 書刊名 | 國立屏東科技大學學報 |
卷 期 | 7:1 1998.03[民87.03] |
頁 次 | 頁1-12 |
分類號 | 388.5 |
關鍵詞 | 水文現象; 表層浮游魚類分布; 臺灣西北部海域; Hydrographic features; Ichthyoplankton distribution; Northwestern Taiwan; |
語 文 | 英文(English) |
中文摘要 | 在臺灣西北部海域內沿一斷面(10個測站)上之浮游魚類季節性調查係於1991年 10月6-7日(秋季)及1992年7月19-20日(夏季)中,以直徑1.3m仔椎魚網(網身長4.5m,網目 0.5mm)採集所得。兩季節的水文現象及浮游魚類分布明顯不同,秋季襄,斷面中部水域出 現一充份混合的水團一由來自臺灣海峽及黑潮的水流交會而成,在東北季風的吹拂下更加 速水團的混合;此一混合的水團限制了魚卵及七星魚、帶魚、鼠鱔、紅□虎屬、發光鯛等 優勢魚種在沿岸水域出現。夏季中斷面出現一溫鹽鋒面,由黑潮、臺灣海峽流及大陸沿岸 流交會所致;此鋒面限制短額稜鰻、紅狼牙蝦虎、正蜥魚出現在深水域,及限制□屬、條 尾鯡鯉、大頭狗母魚出現在沿岸水域,而魚卵的豐度在靠近鋒面兩側的測站較高。本文結 論是秋季的充份混合的水團及夏季的溫鹽鋒面被視為影響優勢魚種在沿岸分布的重要環境 因子。 |
英文摘要 | Ichthyoplankton surveys were conducted by a 1.3 meter diameter ring fitted with cylindrical-conical net (4.5 m long; 0.5 mm mesh size) along a transect over the shelf of N.W. Taiwan in autumn 1991 and summer 1992, respectively. Different hydrographic features and ichthyoplankton distribution were found during two sampling periods. In autumn, the water was well-mixed in mid-transect, a mixture of water from Taiwan Strait and Kuroshio and enhanced by N.E. monsoon. This well-mixed water appeared to limit the distribution of fish eggs and most major larval species such as Benthosemapterotum, Trichiurus lepturus, Gonorynchus abbrevialus, Amblychaeturichthys sp. and Acropomajaponicum near coastal area. While in summer, a thermohaline front caused by the waters from saline Kuroshio and Taiwan Strait and brackish mainland China coast was observed. This front reduced larval abundance of Thrissa purava, Taenioides rubicundus, and Synodus undosquamis in deeper areas and Caranx sp., Upeneus bensasi and Trachinocephalus myops in shallower area. The egg abundance was relatively higher at stations adjacent to the front than itself It is concluded that the well-mixed water in autumn and a thermohaline front in summer both function as an important environmental factors to affect the distribution of fish larvae in the coastal area during the surveyed periods. |
本系統中英文摘要資訊取自各篇刊載內容。