本研究探討2006年2月至2007年10月期間在台灣小琉球附近海域浮游翼足類之種類組成與豐度之時空分布及其與水文因子之相關性。分析結果共發現浮游翼足類6科13屬20種與5個僅鑑定至「屬」等級的未知種，平均豐度為7348 ± 994 ind./ 1000m3，前5個主要優勢種依序為Limacina inflata、Creseis virgula var. conica、Creseis acicula、Limacina trochiformis以及Creseis clava，合佔浮游翼足類總豐度之78.7 %。
小琉球附近海域之海水表層溫度、鹽度與浮游植物豐度在月份間均有顯著差異，浮游植物豐度在2006年顯著高於2007年。浮游翼足類在春季的總豐度顯著高於其他季節，深層採樣的總豐度顯著高於表層採樣；種類數在2007年顯著高於2006年，在季節上則普遍呈現夏季較高，秋季較低的現象，而深層採樣的種類數也顯著高於表層採樣；種歧異度則有夏季高秋季低的趨向。依水文特徵概可分為2007年夏季群、夏秋季、冬末春初及春季四個站群，其中2007年夏季群與其他站群間有明顯差異；翼足類站群分析顯示春季測站間的群聚組成及豐度變異程度與夏秋冬季有較明顯的差異，而種類群集分析則可將小琉球附近海域的翼足類分成豐度及出現率皆較高的廣溫廣鹽種以及相對來說豐度及出現率較低的高溫高鹽種。此外，由線性迴歸結果發現，翼足類總豐度與環境因子間均未有相關，而主要優勢種之豐度均與仔稚魚豐度呈現顯著性正相關，如Limacina inflata、Creseis virgula var. conica及Limacina trochiformis等，而Limacina inflata（p < 0.001）亦與浮游植物豐度有顯著負相關，表示除了水文因素外，翼足類可能也受到仔稚魚的捕食及攝食浮游植物而影響其豐度與群聚分布。

This study investigates the tempo-spatial distribution in species composition and abundance of planktonic pteropods in relation to hydrography in the waters around Liu-chiu Yu Island, southwestern Taiwan from February 2006 to October 2007. In total, we recognized 25 pteropod species belonging to 12 genera and six families, with a mean abundance of 7348 ± 994 ind./ 1000m3. The five most dominant species were Limacina inflata, Creseis virgula var. conica, Creseis acicula, Limacina trochiformis and Creseis clava, together they accounted for 78.7 % of the total pteropods.
The surface sea water temperature, salinity, and phytoplankton concen- tration in the waters around Liu-chiu Yu Island were significantly higher in 2006 than in 2007. Pteropod abundance was higher in spring than in other seasons, and higher in deeper waters than in surface waters. Species number of pteropods was significantly higher in 2007 than in 2006, generally higher in summer and lower in autumn, and higher in deeper waters than in surface waters. Species diversity index of pteropods was generally higher in summer and lower in autumn. Cluster analysis of hydrography included 4 clusters (e.g., 2007 summer, summer and autumn, spring and winter, spring), the 2007 summer cluster was different from other seasons. Pteropod assemblage showed apparent difference between seasons, the variation of pteropod assemblages between stations in spring was higher than other seasons. Linear regression showed that the species number (p < 0.01) and diversity index (p < 0.05) were positively correlated with abundance of fish larvae. Abundance of most dominant species of pteropods was significantly and positively correlated with abundance of fish larvae (e.g., Limacina inflata; Creseis virgula var. conica and Limacina trochiformis) and significantly and negatively correlated with phytoplankton abundance (e.g., Limacina inflata, p < 0.001). In addition to the hydrographic factors, the distribution of pteropods might also be affected by predatory fish larvae and phytoplankton supplement.

章次 頁數
中文摘要------------------------------------------------------------------------------ I
英文摘要------------------------------------------------------------------------------ III
目錄------------------------------------------------------------------------------------ V
表目錄--------------------------------------------------------------------------------- VII
圖目錄--------------------------------------------------------------------------------- IX
附錄目錄------------------------------------------------------------------------------ XI
壹、前言------------------------------------------------------------------------------ 1
1. 1 小琉球相關文獻回顧----------------------------------------------------- 1
1. 2 浮游翼足類相關文獻回顧----------------------------------------------- 2
1. 3 台灣附近浮游翼足類文獻回顧----------------------------------------- 5
貳、材料與方法--------------------------------------------------------------------- 8
2. 1 採樣之時間、地點與方法----------------------------------------------- 8
2. 2 樣品的處理----------------------------------------------------------------- 8
2. 3 資料處理-------------------------------------------------------------------- 9
參、結果------------------------------------------------------------------------------ 12
3. 1 水文環境-------------------------------------------------------------------- 12
3. 2 浮游翼足類豐度、種類數及種歧異度的時空變化----------------- 15
3. 3 主要優勢種的時空變化-------------------------------------------------- 18
3. 4 浮游翼足類之群聚分析-------------------------------------------------- 20
3. 5 浮游翼足類優勢種與環境因子之相關性----------------------------- 22
肆、討論------------------------------------------------------------------------------ 24
4. 1 水文環境因子之探討----------------------------------------------------- 24
4. 2 豐度與物種多樣性分布特徵-------------------------------------------- 26
4. 3 優勢種的組成及季節變化----------------------------------------------- 31
4. 4 浮游翼足類站群及種群之探討----------------------------------------- 34
4. 5 優勢種與環境因子相關性的探討-------------------------------------- 35
伍、結論------------------------------------------------------------------------------ 37
陸、參考文獻------------------------------------------------------------------------ 39
附表------------------------------------------------------------------------------------ 47
附圖------------------------------------------------------------------------------------ 59
附錄------------------------------------------------------------------------------------ 81

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