世界性入侵腹足动物 Styela plicata 的过去、近期和正在进行的进化过程。

IF 4.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Carles Galià-Camps, Alba Enguídanos, Xavier Turon, Marta Pascual, Carlos Carreras
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引用次数: 0

摘要

入侵物种是全球生物多样性面临的主要威胁之一,在海洋生态系统中,石珊瑚类就是其中的突出例子。Styela plicata 是一种栖息在所有温带海洋港口的腹足纲物种,因此被认为是一种茁壮成长的入侵物种。然而,该物种的适应机制、引入历史和种群结构从未被完全阐明。在本文中,我们利用 2b-RADseq 对来自全球 18 个地方的 87 个 S. plicata 个体进行了基因分型,证实了全球范围内存在四种染色体倒位现象,证明了该物种的种群结构,检测了局部适应信号,并推断了历史人口统计事件。我们发现,北卡罗来纳州的个体构成了一个无关联的种群,亚特兰大-地中海和太平洋地区的个体形成了各自的基因群,并出现了亚结构化现象,其中最明显的是大西洋北部和南部地区个体之间的分裂。南卡罗莱纳地区的基因处于北卡罗莱纳和其他两个群体之间的中间位置,这表明其起源于基因流动的杂交。我们生成并测试了人口统计模型,为大西洋和太平洋的两次独立引入事件以及南卡罗来纳种群的起源掺杂提供了证据。最后,我们确定了适应的候选基因位点,其功能涉及细胞过程、新陈代谢、发育和离子传输等。总之,本研究强调了 S. plicata 复杂的历史进程,正是这些历史进程导致了该物种目前在全球海洋中的分布、种群结构和局部适应足迹。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The past, the recent, and the ongoing evolutionary processes of the worldwide invasive ascidian Styela plicata

The past, the recent, and the ongoing evolutionary processes of the worldwide invasive ascidian Styela plicata

Invasive species are one of the main threats to global biodiversity and, within marine ecosystems, tunicates feature some prominent examples. Styela plicata is an ascidian species inhabiting harbours in all temperate oceans and seas, thus being considered a thriving invasive species. However, this species' adaptive mechanisms, introduction history, and population structure have never been completely elucidated. Here, by genotyping 87 S. plicata individuals from 18 localities worldwide with 2b-RADseq, we confirm the global presence of four chromosome inversions, demonstrate population structuring on this species, detect local adaptation signals, and infer historical demographic events. We show that North Carolina individuals constitute an unrelated population, Atlanto-Mediterranean and Pacific localities form their own genetic clusters with substructuring, being the most evident the split between northern and southern Atlantic localities. The locality of South Carolina presents an intermediate genetic position between North Carolina and the other two groups pointing to a hybrid origin with recurrent gene flow. We generate and test demographic models, providing evidence of two independent introduction events to the Atlantic and Pacific, and an admixture that originated the population of South Carolina. Finally, we identify candidate loci for adaptation, with functions involved with cell processes, metabolism, development, and ion transport, among others. Overall, this study highlights the complex historical processes of S. plicata, which have led this species to its current distribution, population structure, and local adaptation footprint in oceans worldwide.

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来源期刊
Molecular Ecology
Molecular Ecology 生物-进化生物学
CiteScore
8.40
自引率
10.20%
发文量
472
审稿时长
1 months
期刊介绍: Molecular Ecology publishes papers that utilize molecular genetic techniques to address consequential questions in ecology, evolution, behaviour and conservation. Studies may employ neutral markers for inference about ecological and evolutionary processes or examine ecologically important genes and their products directly. We discourage papers that are primarily descriptive and are relevant only to the taxon being studied. Papers reporting on molecular marker development, molecular diagnostics, barcoding, or DNA taxonomy, or technical methods should be re-directed to our sister journal, Molecular Ecology Resources. Likewise, papers with a strongly applied focus should be submitted to Evolutionary Applications. Research areas of interest to Molecular Ecology include: * population structure and phylogeography * reproductive strategies * relatedness and kin selection * sex allocation * population genetic theory * analytical methods development * conservation genetics * speciation genetics * microbial biodiversity * evolutionary dynamics of QTLs * ecological interactions * molecular adaptation and environmental genomics * impact of genetically modified organisms
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