本研究於2005年1月至2006年10月間在台灣南部海域共記錄毛顎類4科12屬23種，前四個優勢種為Flaccisagitta enflata（相對豐度（R.A.）：32.2％）、Serratosagitta pacifica（R.A.：20.6％）、Zonosagitta bedfordii（R.A.：12.0％）、Pterosagitta draco（R.A.：8.8％），約佔總豐度的74％。毛顎類各季豐度分佈一般呈現由西向東遞減的趨向，並呈現明顯的季節變化，較高豐度出現在7月∼10月，較小豐度則出現在1月∼5月。毛顎類豐度與橈足類豐度呈顯著正相關，且水文結果顯示具較高營養鹽的南海水團影響黑潮主流流域長達7個月之久（2006年1月至2006年7月），造成這段期間浮游植物（Chl a）增加，使橈足類豐度大增，因而使毛顎類豐度於2006年7月時大增。由複迴歸分析結果顯示毛顎類豐度、種類數及種歧異度與海域環境因子，包括溫度及鹽度，有密切的關連性。主要優勢種毛顎類之生長期皆以Stage I 為最多，佔總毛顎類豐度的80 %左右，推測前四個優勢種於本研究海域皆為終年生殖的種類；另由食物分析結果顯示，毛顎類主要以橈足類為食，但估算的攝食衝擊（PI）僅介於0.25 %∼2.47 %之間。

Temporal and spatial distribution in species composition and abundance of chaetognaths in relation to hydrographic variables in the waters off southern Taiwan were investigated from January 2005 to October 2006. There were 23 species of chaetognaths belonging 4 families and 12 genera recognized in this region. The 4 most dominate species were Flaccisagitta enflata (32.2%), Serratosagitta pacifica (20.6%), Zonosagitta bedfordii (12%) and Pterosagitta draco (8.8%), together comprised about 74% of total chaetognaths. The distribution in abundance of chaetognaths generally decreased from west to east along the transect, and showed clear seasonal change, with the higher abundance occurred from July to October and the lower abundance from January to May. Abundance of chaetognaths increased significantly in July 2006 and positively correlated with the abundance of copepods. Our hydrographic results indicated that South China Sea Current with higher nutrients might dominante over Kuroshio Current in this region from January 2006 to July 2006, and might lead to the increases of phytoplankton (Chl a) and copepods consequently. Furthermore, temperature and salinity also interactively influenced the distribution in abundance and species richness of chaetognaths. Stage I individuals made up the majority of chaetognaths abundance (80%). The breeding period of predominant chaetognaths (F. enflata, S. pacifica, Z. bedfordii and P. draco) are year around. Results from gut content analysis implied that copepods is the main food for chaetognaths in the study area, but the predation impact of chaetognaths on copepods was only about 0.25%∼2.47 %.

摘要………………………………………………………i
Abstract…………………………………………………ii
表目錄……………………………………………………v
圖目錄……………………………………………………vii
附錄目錄…………………………………………………ix
前言………………………………………………………1
材料與方法………………………………………………8
結果………………………………………………………14
討論………………………………………………………24
結論………………………………………………………36
參考資料…………………………………………………38
附表………………………………………………………46
附圖………………………………………………………55
附錄………………………………………………………77

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