本研究是自1999年4月至2000年4月以及2001年5月至2002年4月期間於屏東大鵬灣內進行海月水母族群季節動態及其攝食之研究。海月水母主要分佈於大鵬灣的內灣處，年平均豐度為71±256 ind.100m－3，冬春季豐度較夏秋季高。海月水母豐度與水域環境因子的相關性並不顯著，但其豐度有伴隨橈足類豐度的季節變動而有1~2個月遲滯期。海月水母主要生殖季節是在秋季至隔年春季(9月至隔年4月)，而碟狀幼生體主要出現在冬季及春季，最高豐度達328 ind./100m3。海月水母族群年平均傘徑為13.9±4.2 cm，並且呈現季節性變化，秋季以大型個體居多，春季則以小型個體較多。由海月水母胃內含物組成分析發現，總共有17大類之浮游動物，主要攝食對象為橈足類(70.3%)，其次為橈足類無節幼生(20.1%)、二枚貝幼生(3.0%)及魚卵(2.3%)。海月水母之平均攝食速率為2165±2673 prey ind.-1 day-1 ，對於內灣水域的浮游動物衝擊為14.69 % ~ 40.84 %，不同大小傘徑水母個體的攝食率並無顯著差異。

The population dynamics and the feeding of the scyphomedusa Aurelia aurita in Tapeng Bay, southwestern Taiman, were investigated from April, 1999 to April, 2000 and May, 2001 to April, 2002. A. aurita distributed mainly in the inner water of the Bay. The average abundance of A. aurita was 71±256 ind.100m－3, with higher abundance in winter and spring than in summer and autumn. The abundance of A. aurita showed no significant correlation with hydrographic features, but it seems to have one or two month’s time lag with the seasonal distribution pattern of copepods. The main reproduction period of A. aurita was form autumn to next spring. The occurrence of ephyra was mainly in winter and spring, with maximum abundance of 328 ind./100m3. The average bell diameter of A. aurita was 13.9±4.2 cm. The size of bell diameter varied seasonally, generally had larger size in autumn and smaller size in spring. Seventeen zooplankton taxa were found in the stomach contents of A. aurita, copepods were the most dominant (70.3%), followed by copepods nauplius (20.1%), bivalve larva (3.0%) and fish eggs (2.3%). The average ingestion rate of A. aurita was 2165±2673 prey ind.-1 day-1 , the feeding impact of A. aurita on zooplankton was 14.69 % ~ 40.84 % %, with no significant difference among sizes.

章次 ……………………………………………………… 頁數
前言 ……………………………………………………… 1
材料與方法 ……………………………………………. 6
結果 ………………………………………….…………... 11
討論 ……….……………………………………………... 20
結論 ……………………………………………………... 30
參考文獻 ……………………………………………………… 31
附表 ……………………………………………………… 36
附圖 ……………………………………………………… 42
附錄 ……………………………………………………… 73

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