本研究調查2004年於台灣周邊海域水螅水母的種類組成及數量在不同季節之分佈特徵，並探討其與環境因子間的相關性。綜合四季採樣分析結果，共鑑定出34科65屬101種水螅水母，平均豐度為557 ± 90 inds./1000m3。整體而言，水螅水母豐度並無明顯的季節性變化，但以5月(春)、11月(秋)豐度較高，8月(夏)較低。前8個優勢種水螅水母依序為半口狀麗水母(Aglaura hemistoma)、兩手筐水母(Solmundella bitentaculata)、真瘤水母(Eutima levuka)、四葉小舌水母(Liriope tetraphylla)、高華麗水母(Aglantha elata)、印度感棒水母(Laodicea indica)、寬模棍手水母(Rhopalonema velatum)及真胃穴水母(Sminthea eurygaster)，合佔全部水螅水母豐度的85％。
水螅水母豐度分佈呈現台灣西北部海域較東部及南部海域高的趨勢，種類數及歧異度則以台灣東部及南部海域較高。不同優勢種水螅水母在測站間的分佈情形不盡相同。水螅水母群聚組成則呈現明顯的季節變化。水螅水母群聚豐度在不同水團間的差異明顯，以大陸沿岸流海域較高，種類數及種歧異度則以黑潮海域較高。
本海域水螅水母總豐度與溫度及鹽度並無明顯的相關性，但與浮游動物總豐度呈顯著正相關，種岐異度則與浮游動物總豐度呈顯著負相關，各優勢種與環境因子各有不同相關性，半口狀麗水母(Aglaura hemistoma)與鹽度呈顯著正相關；兩手筐水母(Solmundella bitentaculata)則和鹽度呈顯著負相關，各優勢種水螅水母的豐度與環境因子的相關性隨著季節變動亦各有不同。

Temporal and spatial distribution in species composition and abundance of hydromedusae in relation to hydrographic variables in the waters surrounding Taiwan were investigated from February to November, 2004. A total of 101 species belonging to 65 genera and 34 families hydromedusae were identified, with the mean abundance of 557 ± 90 inds./1000m3. The abundance of hydromedusae showed no significant seasonal change but generally was higher in spring and fall, and lower in summer. The eight dominant species were Aglaura hemistoma、Solmundella bitentaculata、Eutima levuka、Liriope tetraphylla、Aglantha elata、Laodicea indica、Rhopalonema velatum and Sminthea eurygaster, which together contributed 85% of the total hydromedusae.
Hydromedusae showed higher abundance in the waters northwest off
Taiwan, while the species number and diversity were higher in the waters east and south off Taiwan. Hydromedusa communities showed significant difference among water masses, higher abundance in China Costal Current, meanwhile higher species number and diversity in Kuroshio Current. Different dominant species showed different distribution patterns. The total abundance of hydromedusae showed no significant correlation with temperature or salinity, but were positive correlated with zooplankton abundance, while species richness were negatively correlated with zooplankton abundance. Different dominant hydromedusae species showed different correlationships with environmental factors; Aglaura hemistoma showed significant positive correlation with salinity, but Solmundella bitentaculata showed significant negative corelation with salinity. The correlationship between the abundance of each dominant species and evironmental factors varied seasonally.

壹、前言---------------------------------------------------1
貳、材料與方法------------------------------------------8
一、資料收集------------------------------------------8
二、資料處理與分析---------------------------------8
參、結果---------------------------------------------------11
一、水文環境------------------------------------------11
二、種類組成和總豐度、種類數及種歧異度的變
化---------------------------------------------------14
三、優勢種豐度之時空分佈------------------------16
四、豐度群聚分析------------------------------------19
五、水螅水母在水文站群間之差異分析---------22
六、豐度與環境因子之相關性------------------------24
七、豐度、種類數及種歧異度與採樣時間之相關性
------------------------------------------------------26
肆、討論---------------------------------------------------28
一、水文環境因子之探討---------------------------28
二、種類組成及豐度之分佈特徵與比較---------29
三、水文環境變動對優勢種豐度分佈的影響---32
伍、結論---------------------------------------------------40
陸、參考文獻---------------------------------------------42
表------------------------------------------------------------49
圖------------------------------------------------------------80
附錄---------------------------------------------------------123

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