紫口珊瑚螺具宿主專一性且廣泛分布於台灣珊瑚礁海域，本論文進行微孔珊瑚與紫口珊瑚螺的分布調查及實驗，並探討水流對珊瑚螺分布之影響。調查地點包括東北角、台東、綠島、蘭嶼、小琉球和澎湖海域。調查發現各測站微孔珊瑚群體上出現紫口珊瑚螺的比例以東北角最高(45%)，綠島(12%)、蘭嶼(12%)最低，紫口珊瑚螺出現的頻度在測站間有顯著差異(P<0.001)，顯示紫口珊瑚螺分布並不均勻；此外，測站間紫口珊瑚螺殼長頻度分布亦有顯著差異，其中綠島和蘭嶼的紫口珊瑚螺殼長頻度分布非常態；測站間紫口珊瑚螺年齡分布差異顯著，整體而言，紫口珊瑚螺年齡5,6歲之個體數量最多，綠島、蘭嶼和澎湖未發現2歲以下的個體。以數值模擬紫口珊瑚螺幼生沉降軌跡，顯示幼生沉降軌跡因流速和施放點不同而有差異，換言之，流速與幼生於水層的深度會影響著苗所需的底質大小。

The coral-inhabiting snail Coralliophila violacea is a common species in the Indo-Pacific coral reefs and it usually lives on the surface of its host, Porites spp. In this study, field survey on the distribution of C. violacea on poritid corals, Porites spp. among sites were conducted. And the influence of flow rate on the distribution of snails was also examined through a simulation model. The sampling sites were northeastern of Taiwan, Taitung, Penghu, Lutao, Hsiao-liu-chiu and Lanyu. The presence of spatial variability in the relative abundance of C. violacea on porited corals has been observed. The highest percentage of corals with snails was in northeastern Taiwan, i.e. 45% and the lowest ones were in Lutao and Lanyu, i.e. 12%. The distribution of snails among sites were heterogeneous (X2-test of independence; p<0.001). Significant differences of shell length in snails among sites were also found. Among them, the distribution pattern of shell length in snails from Lutao and Lanyu was not normal. Difference in the age-distribution of snails among sites was present. In general, five and six years old snails were most abundant. A lack of snails under two years old had been found in Lutao, Lanyu and Penghu. Based on the simulated downward trajectory of snail larvae, it was indicated that a minimum substratum for larval settlement varied with flow rates and depth of water.

中文摘要……………………………………………………………………………Ⅱ
英文摘要……………………………………………………………………………Ⅲ
目錄…………………………………………………………………………………Ⅳ
表目錄………………………………………………………………………………Ⅴ
圖目錄………………………………………………………………………………Ⅵ
一、 前言……………………………………………………………………………1
二、 材料與方法……………………………………………………………………4
三、 結果……………………………………………………………………………8
四、 討論……………………………………………………………………………19
參考文獻……………………………………………………………………………25

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