Together stronger: Intracolonial genetic variability occurrence in Pocillopora corals suggests potential benefits.,Ecology and Evolution

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Together stronger: Intracolonial genetic variability occurrence in Pocillopora corals suggests potential benefits.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-06-05 , DOI: 10.1002/ece3.5807
Nicolas Oury ₁ , Pauline Gélin _{1,

2} , Hélène Magalon _{1,

2}

Affiliation

We investigated the occurrence of intracolonial genetic variability (IGV) in Pocillopora corals in the southwestern Indian Ocean. Ninety‐six colonies were threefold‐sampled from three sites in Reunion Island. Nubbins were genotyped using 13 microsatellite loci, and their multilocus genotypes compared. Over 50% of the colonies presented at least two different genotypes among their three nubbins, and IGV was found abundant in all sites (from 36.7% to 58.1%). To define the threshold distinguishing mosaicism from chimerism, we developed a new method based on different evolution models by computing the number of different alleles for the infinite allele model (IAM) and the Bruvo's distance for the stepwise mutation model (SMM). Colonies were considered as chimeras if their nubbins differed from more than four alleles and if the pairwise Bruvo's distance was higher than 0.12. Thus 80% of the IGV colonies were mosaics and 20% chimeras (representing almost 10% of the total sampling). IGV seems widespread in scleractinians and beyond the disabilities of this phenomenon reported in several studies, it should also bring benefits. Next steps are to identify these benefits and to understand processes leading to IGV, as well as factors influencing them.

中文翻译：

在一起更强：Pocillopora 珊瑚的群体内遗传变异性表明了潜在的好处。

我们研究了西南印度洋Pocillopora珊瑚中群体内遗传变异（IGV）的发生情况。从留尼汪岛的三个地点对 96 个菌落进行了三次采样。使用 13 个微卫星位点对 Nubbins 进行基因分型，并比较它们的多位点基因型。超过 50% 的菌落在其三个小瘤中呈现出至少两种不同的基因型，并且在所有位点都发现 IGV 丰富（从 36.7% 到 58.1%）。为了定义区分嵌合现象和嵌合现象的阈值，我们通过计算无限等位基因模型（IAM）的不同等位基因的数量和逐步突变模型（SMM）的布鲁沃距离，开发了一种基于不同进化模型的新方法。如果菌落的 nubbins 与四个以上等位基因不同并且成对 Bruvo 距离高于 0.12，则菌落被视为嵌合体。因此，80% 的 IGV 集落是嵌合体，20% 是嵌合体（几乎占总样本的 10%）。 IGV 似乎在石珊瑚中广泛存在，除了几项研究中报道的这种现象的残疾之外，它还应该带来好处。接下来的步骤是确定这些好处并了解导致 IGV 的流程以及影响它们的因素。

更新日期：2020-06-26

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