台灣南部三種孵育幼生型珊瑚，尖枝列孔珊瑚(Seriatopora hystrix)、萼柱珊瑚(Stylophora pistillata)和細枝鹿角珊瑚(Pocillopora damicornis)的釋放幼生具有日夜週期，尖枝列孔珊瑚和萼柱珊瑚的同步性高，集中在日出前釋放幼生；而細枝鹿角珊瑚全天釋放幼生，但在日落後和日出前有兩個高峰，本研究利用改變亮暗週期與溫度探討其控制的環境因子與機制。結果發現，尖枝列孔珊瑚在持續暗和持續亮下不會釋放幼生而無內生性時鐘，幼生在開燈後約23小時且黑暗下才大量釋放，關燈時間和不同水溫(23.5-28.5℃)不影響釋放幼生時間，顯示尖枝列孔珊瑚釋放幼生日夜週期受日出時間調控，但受光線抑制。萼柱珊瑚在持續暗與持續亮下釋放幼生情形與尖枝列孔珊瑚相似，顯示釋放幼生受日出時間調控和受光線抑制且可能無內生性時鐘。細枝鹿角珊瑚在持續暗與持續亮下會釋放幼生，持續暗下可能有約37小時的週期性，顯示釋放幼生的調控機制較複雜。這些結果顯示珊瑚調控釋放幼生的日夜週期可能具有種間的不同機制。

Three brooding corals, Seriatopora hystrix, Stylophora pistillata, and Pocillopora damicornis in Nanwan Bay, southern Taiwan, revealed a diel rhythm of larval release. Planulation by S. hystrix and S. pistillata was highly synchronized with one peak of planula release occurring close to sunrise. Planulae of P. damicornis were released throughout the day with two peaks occurred in the early morning and at night. We maintain corals in laboratory with varied light-dark cycle and temperature to determine the mechanism of their release rhythm. S. hystrix did not release larvae under constant light and constant dark, thus the release of larvae in S. hystrix is not controlled by an endogenous rhythm. Peak of larval release occurs after 23hrs of light cue and under the dark. Temperature treatments, in 1℃ intervals from 23.5-28.5℃, did not change the timing of larval release. We infer that the diel rhythm of larval release of S. hystrix controlled by sunrise. S. pistillata did not release larvae under constant light and constant dark. The larval release pattern of S. pistillata is similar to S. hystrix. Thus, we infer that sunrise may be the cues for the diel rhythm of larval release of S. pistillata. P. damicornis releases larvae under constant light and constant dark, and exhibit a rhythm of larval release with 37 h periodicity under constant dark. The regulation of its larval release is complex. These results suggest that the interspecific mechanism controlling diel rhythm of larval release may be different.

前言 1
材料與方法 4
結果 7
討論 9
參考文獻 12

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