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Impact of river dynamics on the genetic variation of Gypsophila repens (Caryophyllaceae): a comparison of heath forest and more dynamic gravel bank populations along an alpine river
Plant Biology ( IF 4.2 ) Pub Date : 2020-10-15 , DOI: 10.1111/plb.13195 C. Reisch 1 , J. Sattler 1
中文翻译：
河流动力学对满天星（遗传石）遗传变异的影响：沿高山河流的荒地森林和更多动态砾石库种群的比较
更新日期：2020-10-15
Plant Biology ( IF 4.2 ) Pub Date : 2020-10-15 , DOI: 10.1111/plb.13195 C. Reisch 1 , J. Sattler 1
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- Alpine rivers are, despite anthropogenic water flow regulation, still often highly dynamic ecosystems. Plant species occurring along these rivers are subject to ecological disturbance, mainly caused by seasonal flooding. Gypsophila repens typically grows at higher altitudes in the Alps, but also occurs at lower altitudes on gravel banks directly along the river and in heath forests at larger distances from the river. Populations on gravel banks are considered non‐permanent and it is assumed that new individuals originate from seed periodically washed down from higher altitudes. Populations in heath forests are, in contrast, permanent and not regularly provided with seeds from higher altitudes through flooding. If the genetic structure of this plant species is strongly affected by gene flow via seed dispersal, then higher levels of genetic diversity in populations but less differentiation among populations on gravel banks than in heath forests can be expected.
- In this study, we analysed genetic diversity within and differentiation among 15 populations of G. repens from gravel banks and heath forests along the alpine River Isar using amplified fragment length polymorphisms (AFLP).
- Genetic diversity was, as assumed, slightly higher in gravel bank than in heath forest populations, but genetic differentiation was, in contrast to our expectations, comparable among populations in both habitat types.
- Our study provides evidence for increased genetic diversity under conditions of higher ecological disturbance and increased seed dispersal on gravel banks. Similar levels of genetic differentiation among populations in both habitat types can be attributed to the species' long lifetime, a permanent soil seed bank and gene flow by pollinators among different habitats/locations.
中文翻译：
河流动力学对满天星（遗传石）遗传变异的影响：沿高山河流的荒地森林和更多动态砾石库种群的比较
- 尽管人为调节水流，但高山河流仍经常是高度动态的生态系统。这些河流沿线的植物物种受到生态干扰，主要是由季节性洪水引起的。满天星通常在阿尔卑斯山海拔较高的地方生长，但也发生在海拔较低的砾石滩上，沿河直接生长，以及在距离河较远的荒地森林中。砾石滩上的种群被认为是非永久性的，并且假定新个体来自定期从高空冲下的种子。相反，荒地森林中的种群是永久的，没有定期从高海拔地区通过洪水提供种子。如果这种植物物种的遗传结构的强烈影响的基因流通过 种子散布后，种群中遗传多样性的水平将提高，但砾石滩上种群的分化程度将低于荒地森林。
- 在这项研究中，我们分析遗传多样性内和15个种群间分化G.三叶从砾石银行和健康森林沿着利用扩增片段长度多态性（AFLP）高山Isar河。
- 如所假设的，砾石库中的遗传多样性略高于荒地森林种群，但是与我们的预期相反，两种生境类型的种群之间的遗传分化具有可比性。
- 我们的研究提供了证据，表明在更高的生态干扰条件下和在砾石库中种子扩散增加的条件下，遗传多样性增加了。两种生境类型中种群之间遗传分化的相似水平可以归因于该物种的长寿命，永久的土壤种子库和传粉媒介在不同生境/位置之间的基因流。
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