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Temporal patterns of larval settlement and survivorship of two broadcast-spawning acroporid corals

机译：两种产卵繁殖的顶孢珊瑚的幼虫沉降和存活的时间模式

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摘要

Acroporid corals are the main reef-building corals that provide three-dimensional habitats for other reef organisms, but are decreasing on many reefs worldwide due to natural and anthropogenic disturbances. In this study, temporal patterns of larval settlement and survivorship of two broadcast-spawning acroporid coral species, Acropora muricata and A. valida, were examined through laboratory rearing experiments to better understand the potential for larval dispersal of this important coral group. Many larvae were attached (but not metamorphosed) to settlement tiles on the first examination 3-4 days after spawning (AS). The first permanent larval settlement (i.e. metamorphosed and permanently settled juvenile polyps) occurred at 5-6 days AS, and most larval settlement (85-97% of total) occurred within 9-10 days AS. Larval survivorship decreased substantially to around 50% by the first week of the experiment and to approximately 10% by the second to third week. The rates of larval attachment, settlement, and the initial drop in survivorship of larvae suggest that effective dispersal of some acroporid species may largely be completed within the first few weeks AS.
机译：顶孢类珊瑚是主要的造礁珊瑚，可为其他珊瑚生物提供三维栖息地，但由于自然和人为干扰，全球许多珊瑚礁正在减少。在这项研究中，通过实验室饲养实验检查了两个播散产的顶孢珊瑚物种Acropora muricata和A.valida的幼虫沉降和存活的时间模式，以更好地了解这一重要珊瑚群在幼虫扩散中的潜力。产卵后（AS）3-4天的第一次检查，许多幼虫附着（但未变态）在沉降片上。第一次永久性幼虫沉降（即变态和永久性沉降的幼虫息肉）发生在AS的5-6天，而大多数幼虫的沉降（占总数的85-97％）发生在AS的9-10天内。在实验的第一周，幼虫的存活率显着下降至约50％，在第二至第三周下降至约10％。幼虫的附着率，沉降率和幼虫存活率的最初下降表明，某些土卫动物的有效扩散可能在AS的最初几周内就完成了。

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