Fine-scale spatial genetic structure and clonal distribution of the cold-water coral Lophelia pertusa
Fine-scale spatial genetic structure and clonal distribution of the cold-water coral Lophelia pertusa
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DOI：
10.1007/s00338-012-0937-5
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发表时间：
2012-12-01
期刊：
影响因子：
3.5
通讯作者：
Andre, C.
中科院分区：
文献类型：
--
作者：
Dahl, M. P.;Pereyra, R. T.;Andre, C.
确定冷水珊瑚种群内部和种群间的空间遗传结构对了解种群动态、评估冷水珊瑚群落的恢复力和估计生境破碎化的遗传效应具有重要意义。自然种群遗传多样性的空间分布取决于物种的繁殖模式，珊瑚物种通常采用有性繁殖和无性繁殖的混合策略。本文描述了北斯卡格拉克（Skagerrak） 5个礁地的冷水珊瑚礁克隆结构和精细种群遗传结构（< 35 km）。这项研究是首次在深海中进行这种类型的分析。利用13个微卫星位点估算了枇杷克隆个体的基因流和基因型多样性，并对其精细尺度空间分布进行了描述。种群内遗传多样性在5个珊瑚礁区域中有4个较高。这四个珊瑚礁构成了一个基因流不对称的遗传集群，表明了超种群动态。其中一个地方，萨肯礁，在基因上是孤立的，而且是贫瘠的。无性繁殖被发现是L. pertusa的一种非常重要的繁殖方式：在最大的珊瑚礁上发现了35个遗传个体，最大的克隆覆盖了近300 m的面积(2)。
Determining the spatial genetic structure within and among cold-water coral populations is crucial to understanding population dynamics, assessing the resilience of cold-water coral communities and estimating genetic effects of habitat fragmentation for conservation. The spatial distribution of genetic diversity in natural populations depends on the species' mode of reproduction, and coral species often have a mixed strategy of sexual and asexual reproduction. We describe the clonal architecture of a cold-water coral reef and the fine-scale population genetic structure (< 35 km) of five reef localities in the NE Skagerrak. This study represents the first of this type of analysis from deep waters. We used thirteen microsatellite loci to estimate gene flow and genotypic diversity and to describe the fine-scale spatial distribution of clonal individuals of Lophelia pertusa. Within-population genetic diversity was high in four of the five reef localities. These four reefs constitute a genetic cluster with asymmetric gene flow that indicates metapopulation dynamics. One locality, the Sacken reef, was genetically isolated and depauperate. Asexual reproduction was found to be a highly important mode of reproduction for L. pertusa: 35 genetic individuals were found on the largest reef, with the largest clone covering an area of nearly 300 m(2).