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Latitudinal variability in spatial genetic structure in the invasive ascidian, Styela plicata

机译：入侵性海豚（Styela plicata）空间遗传结构的纬度变异性

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摘要

Increases in temperature can shorten planktonic larval durations, so that higher temperatures may reduce dispersal distances for many marine animals. To test this prediction, we first quantified how minimum time to settlement is shortened at higher temperatures for the ascidian Styela plicata. Second, using latitude as a correlate for ocean temperature and spatial genetic structure as a proxy for dispersal, we tested for a negative correlation between latitude and spatial genetic structure within populations, as measured by anonymous DNA markers. Spatial genetic structure was variable among latitudes, with significant structure at low and intermediate latitudes (high and medium temperatures) and there was no genetic structure within high-latitude (low temperature) populations. In addition, we found consistently high genetic diversity across all Australian populations, showing no evidence for recent local bottlenecks associated 5. plicata's history as an invasive species. There was, however, significant genetic differentiation between all populations indicating limited ongoing gene flow.
机译：温度升高会缩短浮游幼虫的持续时间，因此较高的温度可能会减少许多海洋动物的扩散距离。为了检验该预测，我们首先量化了海生Styela plicata在较高温度下如何缩短最短沉降时间。其次，我们使用纬度作为海洋温度的相关因子，并将空间遗传结构作为扩散的替代指标，我们测试了种群中纬度与空间遗传结构之间的负相关性（通过匿名DNA标记测量）。空间遗传结构在各个纬度之间是可变的，在低纬度和中纬度（高温和中温）具有明显的结构，在高纬度（低温）种群中没有遗传结构。此外，我们发现所有澳大利亚人口的遗传多样性一直很高，没有证据表明最近的本地瓶颈与5. plicata作为入侵物种的历史有关。但是，所有种群之间存在显着的遗传分化，表明正在进行的基因流有限。

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    《Marine biology》 |2010年第9期|P.1955-1965|共11页
  • 作者

    Gwendolyn K. David; Dustin J. Marshall; Cynthia Riginos;

  • 作者单位

    School of Biological Sciences,The University of Queensland, Brisbane,QLD 4072, Australia;

    rnSchool of Biological Sciences,The University of Queensland, Brisbane,QLD 4072, Australia;

    rnSchool of Biological Sciences,The University of Queensland, Brisbane,QLD 4072, Australia;

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