珊瑚礁最大的威脅來自於海洋暖化造成的珊瑚白化或死亡。若要有效的管理及保護珊瑚礁，需要了解珊瑚群聚對於溫度升高下的變化及調適能力。利用拍攝測線及以螢光技術監測天然礁體樣框的方式，本研究比較台灣南部南灣海域受核電廠溫排水影響25年的出水口礁區及鄰近未受影響的後壁湖礁區底棲群聚結構與珊瑚補充量的異同。此兩地區皆受間歇性湧升流的影響。出水口的石珊瑚覆蓋率顯著高於後壁湖，軟珊瑚則呈現相反的結果。團塊形及表覆形珊瑚如表孔珊瑚、微孔珊瑚、棘杯珊瑚及菊珊瑚的覆蓋率在出水口顯著高於後壁湖，但分枝形珊瑚如列孔珊瑚及咢柱珊瑚則在後壁湖顯著高於出水口。後壁湖的珊瑚補充量高於出水口，其中後壁湖擁有較多的鹿角珊瑚和列孔珊瑚，出水口則擁有較多的棘杯珊瑚。成體及幼體珊瑚的群聚結構並沒有季節性變化，但珊瑚補充量及其存活率皆在春夏季顯著高於秋冬季。這些結果顯示海水溫度升高及其他環境狀況的改變（如對季風不同的暴露程度和水流）會影響珊瑚不同生命階段的群聚結構。在海洋暖化的影響下，團塊形或表覆形的珊瑚相對於分枝形珊瑚似乎對海洋暖化較有抵抗力。

Coral bleaching and mortality caused by ocean warming is the largest threaten to modern coral reefs. Understanding the change and acclimatization of coral communities to warming temperature is urgent for management and conservation. Using transect photo-surveys and monitoring of natural substratum quadrats with fluorescence technique, we compare the community structure and recruitment of corals between a reef artificially heated by thermal outfall of a nuclear power plant for more than 25 years (Outlet) and a nearby natural reef (Hobihu) in Nanwan Bay, southern Taiwan. Both reefs are influenced by intermittent upwelling induced by internal wave. Abundance of hard corals in Outlet was significant higher than in Hobihu, while soft corals showed an opposite pattern. Coverages of corals such as Montipora spp., Porites spp., Galaxea spp. and Favia spp. were significant higher, but Seriatopora spp. and Stylophora spp. were significant lower in Outlet than in Hobihu. Coral recruitment rates were higher in Hobihu than in Outlet with Hobihu having more Pocilloporidae recruits while Outlet having more Euphylliidae, majorly Galaxea recruits. Coral recruitment rates and their survivorship were significant higher in spring/summer season than in autumn/winter season. These results suggest that elevated seawater temperature with other contrasting environmental conditions (different exposure and current) may change the structure of coral community by influencing differently on various life stages. Massive and encrusting corals may be more resilient to ocean warming.

Contain
ABSTRACT.......................................iii
摘要.......................................... iv
INTRODUCTION.................................. 1
MATERIALS AND METHODS......................... 7
1.Study sites................................. 7
2.Survey methods........................................... 7
3.Temperature recording........................................... 8
4.Data analysis.............................................. 8
RESULTS........................................................ 12
1.Seawater temperature.................................................. 12
2.Benthic community.........................................12
3.Recruitments................................................ 13
4.Survivorship and growth rates of juvenile corals in fixed quadrats................ 14
DISCUSSION.................................................. 16
Spatial variation.............................................. 16
Temporal variation........................................... 18
Pocilloporidae at Hobihu....................................... 18
Conclusion..................................................... 19
Literature cited............................................... 21
Tables......................................................... 32
Figures........................................................ 40
Appendixes..................................................... 53

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