Landscape Dynamics Determine the Small-Scale Genetic Structure of an Endangered Dune Slack Plant Species
Landscape Dynamics Determine the Small-Scale Genetic Structure of an Endangered Dune Slack Plant Species
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DOI：
10.2112/jcoastres-d-10-00128.1
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发表时间：
2012-07-01
影响因子：
--
通讯作者：
Hoffmann, Maurice
中科院分区：
文献类型：
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作者：
Bonte, Dries;Breyne, Peter;Hoffmann, Maurice
Bonte，D.; Breyne，P.; Brys，R.; de la佩纳，E.; D'hondt，B.; Ghyselen，C.; Vandegehuchte，M.L.，和Hoffmann，M.，2012.景观动态决定了濒危沙丘稀疏植物物种的小尺度遗传结构。Journal of Coastal Research，28（4），780-786.西棕榈滩（佛罗里达），ISSN 0749- 0208。了解景观中决定遗传变异的过程是成功管理对环境和遗传瓶颈敏感的受威胁植物物种的关键因素。虽然目前的见解点的重要性，在大的空间尺度上的种群遗传结构的历史景观过程，其相关性在小的空间尺度上已在很大程度上被忽视。在这种情况下，沿海沙丘是一个典型的例子，动态和地质年轻的景观，其中当前和历史的流沙可能会对大量的植物物种的空间动态产生强烈的影响。其中之一是濒危植物物种梅花草，通常栖息在沙丘松弛形成的最近沙位移抛物线沙丘景观。同一沙积过程形成的沙丘坡折带位于同一抛物线单元内。已知该物种会受到扩散限制，当种群之间的遗传交换受到限制时，会发生近亲繁殖。通过扩增片段长度多态性，我们表明，该物种的集合种群和当地景观的水平上显示出遗传亚结构。位于同一抛物线单元内的种群的关系比根据地理距离所预期的要密切得多。此外，种群大小与种群内的遗传多样性有关。因此，该物种的种群遗传结构应被视为一个移动的遗传变异镶嵌，由流沙驱动的景观形成介导。因此，维持沙地动态对于保护动态沙丘景观的遗传多样性至关重要。
Bonte, D.; Breyne, P.; Brys, R.; de la Pena, E.; D'hondt, B.; Ghyselen, C.; Vandegehuchte, M.L., and Hoffmann, M., 2012. Landscape dynamics determine the small-scale genetic structure of an endangered dune slack plant species. Journal of Coastal Research, 28(4), 780-786. West Palm Beach (Florida), ISSN 0749-0208.Understanding the processes that determine genetic variation within landscapes is a crucial factor for successful management of threatened plant species that are sensitive to both environmental and genetic bottlenecks. While current insights point to the importance of historical landscape processes for the genetic structure of populations at large spatial scales, their relevance at small spatial scales has been largely neglected. In this context, coastal dunes are a typical example of dynamic and geologically young landscapes in which current and historical sand drift may have strong impacts on the spatial dynamics of a large number of plant species. One of these is the endangered plant species Parnassia palustris, typically inhabiting dune slacks formed by recent sand displacements in parabolic dune landscapes. Dune slacks originating from the same sand drift process are located within the same parabola unit. The species is known to suffer from dispersal limitation and from inbreeding when genetic exchange between populations is restricted. By means of amplified fragment length polymorphism, we demonstrate that the species shows a genetic substructuring both at the level of the metapopulation and the local landscape. Populations located within the same parabola unit are much more closely related than expected on the basis of geographic distance. Moreover, population size is related to genetic diversity within populations. The species' population genetic structure should consequently be regarded as a shifting mosaic of genetic variation, mediated by sand drift driven landscape formation. Therefore, the maintenance of sand dynamics is essential to preserve genetic diversity in dynamic dune landscapes.