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Genetic variation in the massive coral Porites lobata

机译：块状珊瑚Porites lobata的遗传变异

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In recent years, corals have faced increasing anthropogenic disturbances, leading to regional or local reduction in coral species diversity and reduction in genetic variation. The ability of corals to withstand anthropogenic stress, however, differs between genotypes. To be able to estimate survival and recovery potentials, understanding coral genetic variation is therefore of prime scientific interest. This study investigated genetic variation in the massive coral Porites lobata from Moorea, French Polynesia. Colonies were sampled in "family" patches (one large colony surrounded by medium and small sized individuals). We analyzed the allelic diversity of different patches as well as the genotypic variability and relatedness of individual coral colonies. Additionally, intracolonial genetic variability, the harboring of more than a single genotype within a single colony (individual), was analyzed in this species for the first time. In total, 120 coral colonies from three different size clusters (small, medium and large) were investigated with nine microsatellite markers. The three size clusters were used as an assumed proxy for age (juvenile, young adult and adult). The results showed high levels of genetic variation and low levels of relatedness among and within different size classes. All colonies had individual genotypes, suggesting predominantly sexual reproduction. Intracolonial genetic variability was detectable in 25% of the large adults, 15.6% of young adult colonies and 8.8% of juvenile colonies. This is the first evidence of heterogeneous coral colonies in different age classes of P. lobata. The high levels of genetic variation found between and within individuals indicate that P. lobata might have high levels of potential to adapt to a range of natural and anthropogenic disturbances.
机译：近年来，珊瑚面临着越来越多的人为干扰，从而导致珊瑚物种多样性的区域或局部减少以及遗传变异的减少。但是，不同基因型的珊瑚承受人为压力的能力不同。因此，为了能够估计生存和恢复潜力，了解珊瑚的遗传变异具有重大的科学意义。这项研究调查了来自法属波利尼西亚的莫雷阿岛的大型珊瑚叶状珊瑚的遗传变异。在“家庭”补丁中采样菌落（一个大菌落，周围环绕着中小型个体）。我们分析了不同斑块的等位基因多样性，以及各个珊瑚群落的基因型变异性和相关性。此外，首次对该物种进行了殖民内遗传变异性，即在单个菌落（个体）中具有多个单一基因型的窝藏。总共用三个微卫星标记对来自三个不同大小簇（小，中和大）的120个珊瑚群落进行了调查。这三个大小的聚类被用作年龄（青少年，年轻人和成年人）的假定代表。结果显示不同大小等级之间和之内的遗传变异水平高，相关性低。所有菌落都有各自的基因型，表明主要是有性生殖。在25％的大型成年人，15.6％的年轻成人菌落和8.8％的青少年菌落中可检测到菌内遗传变异。这是在不同年龄等级的斑节对虾中异质珊瑚群落的第一个证据。在个体之间和个体内部发现的高水平遗传变异表明，斑节对虾可能具有适应一系列自然和人为干扰的高水平潜力。

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  • 来源
    《Marine biology》 |2016年第12期|242.1-242.12|共12页
  • 作者

    Schweinsberg M.; Tollrian R.; Lampert K. P.;

  • 作者单位

    Univ Bochum, Dept Anim Ecol Evolut & Biodivers, D-44780 Bochum, Germany;

    Univ Bochum, Dept Anim Ecol Evolut & Biodivers, D-44780 Bochum, Germany;

    Univ Bochum, Dept Anim Ecol Evolut & Biodivers, D-44780 Bochum, Germany;

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