Recognition and selection of settlement substrata determine post-settlement survival in corals
Recognition and selection of settlement substrata determine post-settlement survival in corals
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DOI：
10.1890/04-0298
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发表时间：
2004-12-01
期刊：
影响因子：
4.8
通讯作者：
Negri, A
中科院分区：
文献类型：
--
作者：
Harrington, L;Fabricius, K;Negri, A
分散繁殖体的生境识别和选择性定居大大增加了定居后固着生物的生存机会。为了更好地了解一些物种可以在高度复杂的珊瑚礁生态系统的结构中发挥的关键作用，我们比较了两个独立的，但顺序的过程中的作用：解决选择和解决后的生存。这项研究描述了化学和物理识别和排名的具体解决基质的珊瑚幼虫。已知几种甲壳珊瑚藻（CCA）可诱导珊瑚定居，但它们也采用物理和生物抗定居防御策略，其有效性差异很大。我们研究了两种常见的造礁珊瑚（细鹿角珊瑚和细鹿角珊瑚）的沉积幼虫之间的相互作用。millepora）和五种CCA（Neogoniolithon fosliei，Porolithon onkodes，Hydrolithon reinboldii，Titanoderma prototypum和Lithoporello melobesioides），共同出现在澳大利亚大堡礁的礁顶和斜坡上。当珊瑚幼虫提供了一个选择的解决基质时，观察到不同的解决模式。在最喜欢的基质上定居，CCA物种T。prototypum上，比N. fosliei，最不喜欢的底层。定居后的珊瑚生存率也各不相同的CCA物种之间的反结算策略（脱落的表面细胞层，过度生长，和潜在的化学威慑）。幼虫的定居率，定居后的存活率，以及幼虫的化学提取物的CCA的敏感性都呈正相关。珊瑚礁上的非生物定居基质较为稀疏，因此只有少数CCA物种（特别是T。prototypum）促进珊瑚补充，对构建珊瑚礁生态系统具有重要意义。
Habitat recognition and selective settlement by dispersive propagules greatly increases the post-settlement survival chances of sessile organisms. To better understand the key role some species can play in the structure of highly complex coral reef ecosystems, we compare the role of two independent, but sequential processes: settlement choice and post-settlement survival. This study describes the chemical and physical recognition and ranking of specific settlement substrata by coral larvae. Several species of crustose coralline algae (CCA) are known to induce coral settlement however they also employ physical and biological anti-settlement defense strategies that vary greatly in effectiveness. We examine the interactions between settling larvae of two common reef building coral species (Acropora tenuis and A. millepora) and five species of CCA (Neogoniolithon fosliei, Porolithon onkodes, Hydrolithon reinboldii, Titanoderma prototypum, and Lithoporello melobesioides) that co-occur on reef crests and slopes of the Great Barrier Reef, Australia. Distinct settlement patterns were observed when coral larvae were provided with a choice of settlement substrata. Settlement on the most preferred substratum, the CCA species T. prototypum, was 15 times higher than on N. fosliei, the least preferred substratum. The rates of post-settlement survival of the corals also varied between CCA species in response to their anti-settlement strategies (shedding of surface cell layers, overgrowth, and potential chemical deterrents). Rates of larval settlement, post-settlement survival, and the sensitivity of larvae to chemical extracts of CCA were all positively correlated across the five species of CCA. Nonliving settlement substrata on coral reefs is sparser consequently the fact that only a few CCA species (notably T. prototypum) facilitate coral recruitment, has important implications for structuring the reef ecosystem.