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首页> 外文期刊>Marine ecology >The genetic structure of the exotic ascidian Styela plicata (Tunicata) from Italian ports, with a re-appraisal of its worldwide genetic pattern
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The genetic structure of the exotic ascidian Styela plicata (Tunicata) from Italian ports, with a re-appraisal of its worldwide genetic pattern

机译：来自意大利港口的外来海豚Styela plicata（Tunicata）的遗传结构，并对其世界范围的遗传模式进行了重新评估

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摘要

The pleated ascidian Styela plicata (Lesueur, 1823) is a solitary species commonly found in ports and marinas around the world. It has been recorded in the Mediterranean region since the mid-19th century. In the present work, the species’ genetic diversity was analysed, employing a 613-bp portion of the mitochondrial cytochrome c oxidase subunit I (COI) gene from 149 individuals collected in 14 ports along Italian coasts at spatial scales ranging from 1 to approximately 2200km. Haplotype and nucleotide diversity values were h=0–0.933 (total h=0.789) and π=0–0.145 (total π=0.0094), respectively. A general southward trend of increasing within-population genetic diversity was observed. Analysis of molecular variance revealed significant genetic structuring but no significant differences were detected among basins, and no isolation by distance was found. Our data were integrated with the COI sequences available from previous studies and re-analysed in order to investigate the possible routes of introduction of this ascidian into the Mediterranean Sea. The presence of the two COI haplogroups detected in previous molecular investigations on S. plicata at intercontinental spatial scale was confirmed in the Mediterranean Sea. The results revealed multiple introductions of S.plicata, although some locations appear to have experienced rapid expansion from few founding individuals with reduced genetic diversity. However, continuous introductions would confound the pattern deriving from single founder events and make it difficult to estimate the time needed for gene diffusion into established populations. This mixing of effects creates difficulties in understanding the past and current dynamics of this introduction, and managing this alien invasive ascidian whose genetic structure is continuously shuffled by vessel-mediated transport.
机译：褶状海豚Styela plicata（Lesueur，1823）是一种单栖物种，普遍存在于世界各地的港口和码头。自19世纪中叶以来，它已在地中海地区记录下来。在目前的工作中，利用从意大利海岸的14个港口收集的149个个体的线粒体细胞色素c氧化酶亚基I（COI）基因的613 bp部分，对物种的遗传多样性进行了分析，其空间范围从1到大约2200 km 。单倍型和核苷酸多样性值分别为h = 0-0.933（总h = 0.789）和π= 0-0.145（总π= 0.0094）。观察到总体内部种群遗传多样性增加的总体趋势。分子方差分析显示了显着的遗传结构，但在盆地之间未发现显着差异，也未发现距离隔离。我们的数据与以前研究中获得的COI序列进行了整合，并进行了重新分析，以调查将该海鞘引入地中海的可能途径。在地中海地区，证实了先前在洲际空间尺度上对S. plicata进行分子研究时发现的两个COI单倍体的存在。该结果揭示了S.plicata的多次引入，尽管一些地方似乎已经经历了少数遗传多样性降低的创始个体的快速扩张。但是，连续的介绍会使从单一创始人事件中衍生的模式变得混乱，并且难以估计基因扩散到已建立种群中所需的时间。这种混杂的效果在理解此介绍的过去和当前动态以及管理该外来侵入性海鞘方面困难重重，该外来入侵性海鞘的遗传结构被血管介导的运输不断地打乱。

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