Coral recruitment: Consequences of settlement choice for early growth and survivorship in two scleractinians
Coral recruitment: Consequences of settlement choice for early growth and survivorship in two scleractinians
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DOI：
10.1016/s0022-0981(96)02622-6
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发表时间：
1996-12-01
影响因子：
2
通讯作者：
Mundy, C
中科院分区：
文献类型：
--
作者：
Babcock, R;Mundy, C
研究了两种造礁珊瑚的定居、早期生存和生长，以评估这些过程在确定成年珊瑚分布方面的重要性。实验进行了使用的幼虫Platygra sinensis（爱德华兹和Haime），浅水种与巨大的形态，和Oxypora lacera（Verrill），一个喜阴或深水种与层状形态。在实验场外壳的解决方向不同，根据深度，Oxypora选择更神秘的微生境比Platygyra。利用不同的光照强度的实验室沉降实验表明，光照水平是负责沉降方向随深度变化的变量。幼虫的总数量在一定范围内的深度解决不符合成人的分布为两个物种，虽然有显着的变化，在解决深度。对于每个物种的青少年，在生长和生存与深度的变化与成人分布不一致。这些结果，结合沉降实验，表明沉降前的因素可能在决定礁规模的分布格局中发挥重要作用。实验基质上的定居方向影响生长速率，这是高度相关的生存。在定居后的头几个月，死亡率最高的高度沉积的上表面。然而，在接下来的5个月里，这些上表面的生长和存活率最高，大概是因为那里的光照水平高于下表面。实验表面上的沉降密度与随后的存活率之间没有相关性。这可能是由于新定居的珊瑚对不同死亡来源的敏感性随时间而变化。没有一个单一的定居方向提供了一种手段，以优化生存通过这些变化的过程。
Settlement, early survivorship and growth of two species of reef-building corals were studied in order to assess the importance of these processes in determining the distribution of adult corals. Experiments were conducted using larvae of Platygra sinensis (Edwards and Haime), a shallow water species with a massive morphology, and Oxypora lacera (Verrill), a shade-loving or deep water species with a laminar morphology. Settlement orientations in experimental field enclosures varied according to depth, Oxypora choosing more cryptic microhabitats than Platygyra. Laboratory settlement experiments utilising different light intensities indicated that light level was the variable responsible for changes in settlement orientation with depth. Total numbers of larvae settled at a range of depths did not correspond with adult distribution for either species, though there were significant variations in settlement with depth. For juveniles of each species, variations in growth and survivorship with depth were inconsistent with adult distributions. These results, in combination with the settlement experiments, suggest that pre-settlement factors may play an important role in determining reef-scale distribution patterns. Settlement orientation on experimental substrata influenced growth rates, which were highly correlated with survivorship. In the first few months after settlement, mortality was highest on highly sedimented upper surfaces. However, growth and survivorship were highest on these upper surfaces during the following 5 months, presumably because of higher light levels there than on undersurfaces. There was no correlation between settlement density on experimental surfaces and subsequent survivorship. This may be due to the fact that the susceptibility of newly settled corals to different sources of mortality changes over time. No single settlement orientation provided a means to optimise survivorship through the course of these changes.