海草床是一個具高生產力的生態系統，提供各種草食生物以及食碎屑生物豐富的食物來源，一直都是生態學家的研究重點之一，海草床會形成一個複雜的生態系統，並藉由海草的地下根在穩定底質環境上扮演一個重要的角色。本研究地點位於小琉球多仔坪潮間帶上的海草床中（N 22°20"55' E 120°21"49'），利用結構方程模式（Structural Equation Modeling）探討柱形瘤海葵（Phymanthus strandesi）與環境因子之間的關係。此外，為瞭解柱形瘤海葵對環境因子的反應，在實驗室中進行溫度與光度的操控實驗，以觀察柱形瘤海葵在面對環境因子改變時的行為變化。結果顯示在冬季和夏季的模式中，泰來草（Thalassia hemprichii）對柱形瘤海葵的影響都是正向的，但是關係相較於其他環境因子並不顯著；而在環境因子中，土深是對柱形瘤海葵與泰來草都具有正向關係的，表示土深可能是藉由泰來草間接影響柱形瘤海葵的關鍵因子。環境因子的實驗結果顯示，當水溫達到38°C以上時柱形瘤海葵就會出現躲避的行為，而在光度實驗中以探照燈照射的結果則呈現非一致性的躲避反應。

Seagrass bed is a highly productivity ecosystem, it also provides habitats for animals and plays an important role in stabilizing the substrate. The sea anemone Phymanthus strandesi is very abundant in the seagrass bed of Thalassia hemprichii on Hsiao-Liuchiu Island. Structural Equation Modeling (SEM) was used to investigate the relationship between P. strandesi and some environmental factors, which affect the distribution of this species at Tuozaiping tidal flat (N 22°20"55' E 120°21"49'), Hsiao-Liuchiu Island. Light and temperature were also manipulated in the laboratory to test their effect on the hiding response of P. strandesi. The results of SEM show that the abundance of T. hemprichii showed very weak positive relation with P.strandesi. On the other hand, soil depth on the seagrass bed might be the main factor that affects the distribution of P. strandesi. In high a temperature situation (i.e. over 38°C), all the sea anemones in the experimental container hided into the sand.
However, only some sea anemones hid when exposed to strong light (i.e. 5030 lum/ft²) after one and half hours.

目錄.................................................................................................................................I
表目錄...........................................................................................................................II
圖目錄..........................................................................................................................III
附錄目錄......................................................................................................................IV
摘要...............................................................................................................................V
Abstract........................................................................................................................VI
壹、前言.........................................................................................................................1
貳、材料與方法.............................................................................................................6
參、結果.......................................................................................................................12
肆、討論.......................................................................................................................16
伍、結論.......................................................................................................................22
陸、參考文獻...............................................................................................................23
表..................................................................................................................................29
圖..................................................................................................................................31
附錄..............................................................................................................................47

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