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首页> 外文期刊>International journal of plant sciences >DECLINING GENETIC DIVERSITY AND INCREASING GENETIC ISOLATION TOWARD THE RANGE PERIPHERY OF STIPA PENNATA, A EURASIAN FEATHER GRASS
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DECLINING GENETIC DIVERSITY AND INCREASING GENETIC ISOLATION TOWARD THE RANGE PERIPHERY OF STIPA PENNATA, A EURASIAN FEATHER GRASS

机译：降低遗传多样性，提高遗传隔离度，朝着欧洲羽毛草STIPA PENNATA的范围外缘发展

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摘要

A common assumption in ecology and evolutionary biology is that genetic diversity declines and differentiation increases toward the edge of a species' geographic range, where populations tend to be smaller and more isolated. We tested these predictions in a characteristic Eurasian steppe plant, Stipa pennata, by inspecting 230 AFLP bands in 26 populations (345 individuals) along a 3300-km longitudinal gradient from the range core, in Russia, to the range periphery, in central Europe. Overall, our study species showed low genetic diversity within populations (mean proportion of polymorphic bands = 21.2%) and moderately high genetic differentiation among them (mean Φ_(ST) = 0.29). As predicted, genetic diversity declined significantly from the range core to the periphery but was not correlated with population size. Pairwise genetic differentiation was significantly higher among peripheral populations than central populations but did not show a pronounced relationship with geographic distance. Our results indicate that peripheral populations may experience higher genetic drift and lower gene flow than their central counterparts, possibly because of smaller population sizes, spatial isolation, and a more complex landscape structure. In addition, historic range fluctuations and the mixed breeding system could have enhanced the observed patterns in our study species.
机译：在生态学和进化生物学中，一个普遍的假设是，遗传多样性在物种地理范围的边缘逐渐减少，而分化却在增加，而该物种的地理范围往往更小，更孤立。我们在一个典型的欧亚草原植物Stipa pennata中测试了这些预测，方法是从俄罗斯山脉中心到中欧山脉外围3300公里的纵向梯度，检查26个种群（345个个体）中的230个AFLP带。总体而言，我们的研究物种显示出种群内较低的遗传多样性（多态性条带的平均比例= 21.2％），而种群之间的遗传分化程度较高（平均Φ_（ST）= 0.29）。如预测的那样，遗传多样性从范围核心到外围显着下降，但与种群数量无关。成对的遗传分化在外围人群中明显高于中心人群，但与地理距离没有明显的关系。我们的结果表明，外围种群可能比其中央种群具有更高的遗传漂移和更低的基因流动，这可能是由于种群规模较小，空间隔离以及更复杂的景观结构所致。此外，历史范围的波动和混合育种系统可能会增强我们研究物种中观察到的模式。

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  • 来源
    《International journal of plant sciences》 |2012年第7期|p.802-811|共10页
  • 作者

    Viktoria Wagner; Jan Treiber; Jiri Danihelka; Eszter Ruprecht; Karsten Wesche; Isabell Hensen;

  • 作者单位

    Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Am Kirchtor 1, D-06108 Halle, Germany,College of Forestry and Conservation, University of Montana, Missoula, Montana 59812, U.S.A.;

    Senckenberg Museum of Natural History, Gorlitz, P.O. Box 300 154, D-02806 Gorlitz, Germany;

    Department of Vegetation Ecology, Institute of Botany, Academy of Sciences of the Czech Republic, Lidicka 25/27, CZ-60200 Brno, Czech Republic, and Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlarska 2, CZ-61137 Brno, Czech Republic;

    Hungarian Department of Biology and Ecology, Babes-Bolyai University, Str. Republicii 42, RO-400015 Cluj Napoca, Romania;

    Senckenberg Museum of Natural History, Gorlitz, P.O. Box 300 154, D-02806 Gorlitz, Germany;

    Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Am Kirchtor 1, D-06108 Halle, Germany;

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  • 正文语种 eng
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  • 关键词

    abundant-center model; AFLP; fragmentation; geographic distribution range; range center;

    机译：富中心模型AFLP;碎片化地理分布范围;范围中心;

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