郭世杰 碩士論文中英摘要 四種共棲雀鯛(網紋光鰓雀鯛 Dascyllus reticulatus、三帶光鰓雀鯛 Dascyllus aruanus、三點光鰓雀鯛 Dascyllus trimaculatus及藍綠光鰓雀鯛 Chromis viridis)底 質利用之研究 　　為了了解一群共棲於同一個珊瑚礁區的珊瑚礁魚類空間使用及資源分配的情況，於非生殖季節在墾丁台電第三核能發電廠進水口水域記錄網紋光鰓雀鯛(Dascyllus reticulatus)、三帶光鰓雀鯛(D. aruanus)及三點光鰓雀鯛(D. trimaculatus)個別在30個樣區內的出現頻度，並調查樣區珊瑚及底質組成來評估此三種雀鯛空間利用與底質的關係。以複迴歸分析建立三種Dascyllus屬雀鯛空間利用的模式，三種雀鯛在樣區出現頻度均受樣區內珊瑚組成影響。而網紋光鰓雀鯛種內體型大小不同的個體其空間利用模式與枝狀珊瑚的間隙大小有關。 　　另於生殖期時觀察此三種Dascyllus屬雀鯛及藍綠光鰓雀鯛 (Chromis viridis)產卵所使用的底質種類及深度。結果發現藍綠光鰓雀鯛所使用的深度比其他三種雀鯛淺。在底質的使用上，三帶光鰓雀鯛有相當高的比例使用枝狀珊瑚表面作為產卵場所(76%)，其他三種雀鯛所使用的產卵場底質差異不大。綜合底質及深度的使用情況，以網紋光鰓雀鯛與三點光鰓雀鯛間的差異最小(overlap index (Oi) = 0.7352) ，藍綠光鰓雀鯛與三帶光鰓雀鯛差異最大(Oi = 0.1539)。 　　針對網紋光鰓雀鯛所選擇的產卵場特性包括深度、種類及面積等與所獲得的卵面積進行分析。發現底質的種類及所在的深度並不會影響單位面積上的卵數。雄魚所擁有的產卵場表面積越大，未來所能獲得的卵量有較多的趨勢(R = 0.497,p < 0.01)，顯示雄魚的生殖成功率(獲卵量)取決於所擁有的產卵場大小。另一方面雄魚的體型大小與其所佔有的產卵場面積呈正相關(R = 0.395, p < 0.01)。 Substrate utilization of four coexisting pomacentrids (Dascyllus reticulatus、Dascyllus aruanus、Dascyllus trimaculatus and Chromis viridis) 　　Substrate utilization of the coexisting Dascyllus reticulatus、D. aruanus and D. trimaculatus on the intake channel of the Nuclear Power plant III at Kenting was studied. Numbers of individuals of the three Dascyllus damsefish species in 30 sampling grids were counted in every other two weeks during the nonbreeding season. Substrate features of the sampling grids were surveyed in August 1993. Data were analysed using multiple-regression method. Results suggest that numbers of Dascyllus species recorded within a sampling grid was correlated with corals composition in the grids. 　　For assessing the substrate utilization and degree of resource partitioning during breeding season, depths used for nesting and types of substrate in these three Dascyllus species and Chromis viridis were compared. C. viridis nested at 1 to 3m, and Dascyllus nested below 2m. D. aruanus preferred branching corals for nesting (76%). There was no significant difference between D. reticulatus 、D. trimaculatus and C. viridis in preference of nesting substrate (they suggest overlap of resource utilization between C. viridis and D.aruanus was low (overlap index (Oi)=0.1549), where as overlap between D. reticulatus and D. trimaculatus was high (Oi=0.7822). 　　Reproductive success in male D. reticulatus was determined by the number of egg batches that a male received in a reproductive cycle which usually lasted for four days. Relationship of nesting substrate features (e.g., depth 、size of nest and type of substrate) and reproductive success was analyzed . Significant correlation was found between reproductive success and nesting substrate area (R = 0.497, p < 0.01).