由2009年7月至2010年4月期間於台灣西南海域10個測站的毛顎類樣品進行分析，共發現4科14屬35種毛顎類，其中表層拖網發現4科14屬35種毛顎類，平均豐度為2911 ± 586 ind./100m3，平均種歧異度為2.86 ± 0.06；斜拖採樣則發現4科14屬30種毛顎類，平均豐度為3180 ± 532 ind./100m3 ，平均種歧異度為2.96 ± 0.07，前五優勢種為Flaccisagitta enflata、Aidanosagitta regularis、Aidanosagitta neglecta及A. delicate、Serratosagitta pacifica，合佔總豐度的72 %。台灣西南海域的水文環境在不同季節分別受到不同季風與水團的影響，導致夏季時呈現高溫低鹽高營養鹽，冬季則為低溫高鹽低營養鹽的現象，使得本區域毛顎類的豐度分布呈現夏季時較高，春季時較低，且近岸較遠岸高的趨勢。由複迴歸分析結果顯示毛顎類豐度與橈足類豐度成正相關，與海水溫度、鹽度則無顯著相關。主要優勢種之生長期皆以Stage I為最多，約佔各季總豐度的47∼89 %，而成熟的個體(Stage III以上)主要出現在4月，推測前五個優勢種於本研究海域皆為終年生殖的種類。Fl. enflata、A. regularis、A. delicate及Se. pacifica的平均體長( Average Body Length, ABL )於春季較大、夏季較小，但A. neglecta則呈現冬季較大，夏、秋季較小的季節變化。不同水團環境對毛顎類之平均生長期( Weight Mean Stage, WMS )及平均體長亦有所影響，Fl. enflata的ABL及Se. pacifica的WMS在鹽度較高的水團會較大；而Se. pacifica的ABL在冬季時則與溫度及鹽度呈現正相關。推論台灣西南海域季風與水團的消長應是影響毛顎類群聚分布的重要因素。

Thirty-five species of chaetognaths belonging to fourteen genera and four families were identified in the waters of southwestern Taiwan from July 2009 to April 2010. In surface tows, thirty-five species of chaetognaths belonging to fourteen genera and four families were found, with mean abundance of 2911 ± 586 ind./ 100m3; in oblique tows, thirty species of chaetognaths belonging to fourteen genera and four families were identified, with mean abundance of 3180 ± 532 ind./ 100m3. The five predominant species were Flaccisagitta enflata, Aidanosagitta regularis, A. neglecta, A. delicate and Serratosagitta pacifica, together they constituted 72 % of the total catch. The hydrographic conditions in the waters southwestern Taiwan were affected by seasonal monsoons and water masses. Higher temperature, lower salinity, and higher nutrient concentration were found in summer, and lower temperature, higher salinity, and lower nutrient concentration in winter. Generally higher abundance of chaetognath was found in summer and in inshore waters, and lower in spring and in offshore waters. Furthermore, the abundance of chaetognath showed significantly positive correlation with copepods, but no significant correlation with temperature and salinity. The predominant chaetognaths were mostly stage I (47 ~ 89 %), adult stage(>stage III) was mainly found in April. The average body lengths (ABL) of Fl. enflata, A. regularis, A. delicate and Se. pacifica were larger in spring than in summer, while the ABL of A. neglecta exhibited larger in winter than in summer and autumn. This study implies that the distribution of weight mean stage (WMS) and ABL of chaetognath were likely influenced by the water masses, because the ABL of Fl. enflata and WMS of Se. pacifica were larger in high salinity waters, furthermore, this study found that the seasonal moonsons and the succession of water masses maybe played important factors in the distribution patterns of chaetognaths.

論文審定書.........i
謝辭...............ii
摘要...............iii
Abstract.......... iv
目錄...............v
表目錄.............vi
圖目錄.........viii
附錄目錄......... xii
壹、前言..............1
貳、材料與方法...6
參、結果..............9
肆、討論............21
伍、結論............30
陸、參考文獻.....31

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