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在回答以前請先看以下文章:
http://reefkeeping.com/issues/2003-05/eb/index.htm
The second group is divided into two subgroups depending on how gametes come into contact with each other. Broadcast spawners release eggs and sperm into the water column for external fertilization and development. Brooders have eggs fertilized internally with development of the planulae within the polyps. The majority of corals studied are broadcast spawners (approximately 85 percent), with the remaining 15 percent being brooders. Until recent times, it was believed that most corals were "viviparous," or brooders. Notably contrary to most animals, some coral species, such as Pocillopora damicornis, are known to exhibit both brooding and broadcast spawning reproductive methods in different locations. It has also been proposed that this may be a valid reason to examine such populations to see if they are really separate species or subspecies.
不管是孵育型( brooder) 或 排放型 (broadcast )的有性生殖, 都不是自體受精, 還是要由別株珊瑚
排放精子來受精(否則有性生殖就失去意義), 在以往認為 brooder> broadcast, 但是現在知道
brooder 只佔有性生殖的 15%, 並不是那麼常見
http://www.aquarium.net/0397/0397_6.shtml
In aquariums, sexual reproductions of Pocillopora are becoming more common, but Pocillopora also reproduces asexually in a more common way called polyp bail-out. Sometimes sporadically, and often in response to stress, Pocillopora is noted along with a handful of other corals, to simply release it's polyps from the skeleton. The polyps then settle, begin calcifying a new skeleton, and perhaps many new colonies can thus be born
在 Pocillopora, 無性生殖還是比較常見, 其原因還是以stress 為主
我並不完全排除 Xl 的小鹿角是有性生殖, 但除非有觀察過排精的場面, 否則以水族箱
的環境要觀察到成功的有性生殖機會不是那麼大, 無性生殖的可能性較大
http://reefkeeping.com/issues/2003-05/eb/index.htm
The second group is divided into two subgroups depending on how gametes come into contact with each other. Broadcast spawners release eggs and sperm into the water column for external fertilization and development. Brooders have eggs fertilized internally with development of the planulae within the polyps. The majority of corals studied are broadcast spawners (approximately 85 percent), with the remaining 15 percent being brooders. Until recent times, it was believed that most corals were "viviparous," or brooders. Notably contrary to most animals, some coral species, such as Pocillopora damicornis, are known to exhibit both brooding and broadcast spawning reproductive methods in different locations. It has also been proposed that this may be a valid reason to examine such populations to see if they are really separate species or subspecies.
不管是孵育型( brooder) 或 排放型 (broadcast )的有性生殖, 都不是自體受精, 還是要由別株珊瑚
排放精子來受精(否則有性生殖就失去意義), 在以往認為 brooder> broadcast, 但是現在知道
brooder 只佔有性生殖的 15%, 並不是那麼常見
http://www.aquarium.net/0397/0397_6.shtml
In aquariums, sexual reproductions of Pocillopora are becoming more common, but Pocillopora also reproduces asexually in a more common way called polyp bail-out. Sometimes sporadically, and often in response to stress, Pocillopora is noted along with a handful of other corals, to simply release it's polyps from the skeleton. The polyps then settle, begin calcifying a new skeleton, and perhaps many new colonies can thus be born
在 Pocillopora, 無性生殖還是比較常見, 其原因還是以stress 為主
我並不完全排除 Xl 的小鹿角是有性生殖, 但除非有觀察過排精的場面, 否則以水族箱
的環境要觀察到成功的有性生殖機會不是那麼大, 無性生殖的可能性較大
請參考以下資料, 有講的很清楚, 不論是 brooder, 或 broadcast spawner
都還是要有排精的過程, 只不過卵子受孕的場所不同
http://www.wired.com/news/print/0,1294,52074,00.html
Coral reproduction varies according to species, Coffroth said. In "brooder" colonies, male coral squirts clouds of sperm into the sea water, where it drifts over a female coral and fertilizes the eggs. In "broadcast spawner" colonies, both sexes squirt their reproductive cells into a water column where fertilization occurs. Embryos develop into swimming larvae or "recruits," which either settle near the parental colony or drift on the ocean currents for hundreds of kilometers to distant reefs.
都還是要有排精的過程, 只不過卵子受孕的場所不同
http://www.wired.com/news/print/0,1294,52074,00.html
Coral reproduction varies according to species, Coffroth said. In "brooder" colonies, male coral squirts clouds of sperm into the sea water, where it drifts over a female coral and fertilizes the eggs. In "broadcast spawner" colonies, both sexes squirt their reproductive cells into a water column where fertilization occurs. Embryos develop into swimming larvae or "recruits," which either settle near the parental colony or drift on the ocean currents for hundreds of kilometers to distant reefs.
