Evidence for broadcast spawning as well as brooding in the scleractinian coral Pocillopora damicornis
Evidence for broadcast spawning as well as brooding in the scleractinian coral Pocillopora damicornis
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造石珊瑚 Pocillopora damicornis 散播产卵和育雏的证据
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发表时间：
1992
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影响因子：
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通讯作者：
S. Ward
中科院分区：
文献类型：
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作者：
S. Ward
1988年8月20日至1989年8月20日，在澳大利亚西部的Rottnest岛对88个Pocillopora damicornis种群的生殖活动进行了12个月的观察。在1989年2月、3月和4月的三个新月附近发现了幼虫，但只有在3月才有大量的幼虫，67%的珊瑚产生了幼虫。配子发生和育雏幼虫的产生之间没有明显的联系;然而，那些不产生幼虫的珊瑚也不产生卵子，但产生精子，必须被视为雄性群体。所有产生卵子的菌落继续产生浮浪。精子发生发生在全年，但卵子发生在1988年9月至1989年4月。1989年2月初和4月初，含有卵子和精子的息肉的百分比急剧下降。在这些日期，珊瑚组织中的脂质量减少，这表明带有精子和卵子的珊瑚虫百分比的下降不是由于配子被珊瑚虫吸收。因此，在罗特内斯特岛的红腹滨鹬似乎既是一个育雏者和传播者，通过育雏幼虫进行无性繁殖，通过配子产卵进行有性繁殖。这解释了文献中早期的证据，即在罗特内斯特岛的红角裸腹蛛种群中发生了一些有性生殖的输入。没有直接的证据表明产卵，因为没有观察到配子的传播，但间接证据为这种双重繁殖的存在提供了强有力的论据。
The reproductive activity of 88 colonies of Pocillopora damicornis at Rottnest Island, Western Australia, was examined over 12 mo (20 August 1988 to 20 August 1989). Larvae were found close to the three new moons of February, March and April, 1989, but in large numbers only during March; 67% of all corals produced larvae. There was no obvious connection between gametogenesis and the production of brooded larvae; however, those corals which did not produce, larvae also did not produce ova but did produce, sperm, and must be considered male colonies. All colonies which produced ova went on to produce planulae. Spermatogenesis occurred throughout the year, but oogenesis occurred between September 1988 and April 1989. Dramatic declines in the percentage of polyps containing eggs and sperm occurred in early February and early April 1989. On these dates the amount of lipid in the tissue of the corals decreased, which suggests that the decline in the percentage of polyps with sperm and eggs was not due to the gametes being resorbed by the polyps. Therefore, P. damicornis at Rottnest Island appears to be both a brooder and a broadcaster with asexual reproduction through brooded larvae and sexual reproduction through spawning of gametes. This accounts for earlier evidence in the literature that some input from sexual reproduction had been occurring in the populations of P. damicornis at Rottnest Island. There is no direct evidence for spawning, as broadcasting of gametes has not been observed, but the indirect evidence provides a strong argument for the existence of this dual reproduction.