Genetic structure in hybrids and progenitors provides insight into processes underlying an invasive cattail (Typha × glauca) hybrid zone,Heredity

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Genetic structure in hybrids and progenitors provides insight into processes underlying an invasive cattail (Typha × glauca) hybrid zone
Heredity ( IF 3.1 ) Pub Date : 2020-03-18 , DOI: 10.1038/s41437-020-0307-y
Sara Pieper ₁ , Marcel Dorken _{1,

2} , Joanna Freeland _{1,

2}

Affiliation

Traditional models of hybrid zones have assumed relatively low hybrid fitness, and thus focussed more on interspecific gene flow than on hybrid dispersal. Therefore, when hybrids have high fitness and the potential for autonomous dispersal, we have limited understanding of whether hybrid dispersal or repeated local hybrid formation is more important for maintaining hybrid zones. The invasive hybrid cattail Typha × glauca occupies an extensive hybrid zone in northeastern North America where it is sympatric with its progenitors T. latifolia and T. angustifolia. We characterized genetic diversity and genetic structure of the three taxa across a broad spatial scale where the maternal parent is relatively rare, and tested the hypothesis that the hybrid shows stronger evidence of gene flow than its progenitor species, particularly among disturbed sites (ditches) compared with established wetlands. Support for this hypothesis would suggest that dispersal, rather than repeated local formation, is more important for maintaining hybrid zones. Within each taxon, genetic differentiation among ditches was comparable to that among wetlands, although clonal richness was consistently greater in ditches, suggesting more frequent seed establishment. Genetic structure across sites was more pronounced in the hybrid compared with either progenitor species. Overall, our data reflect relatively low gene flow in hybrids, and suggest that hybrids are more likely to be created in situ than to be introduced from other sites. Despite the high fitness of invasive T. × glauca and its potential for autonomy, local processes appear more important than dispersal in maintaining this hybrid zone.

中文翻译：

杂交种和祖先的遗传结构提供了对入侵香蒲（香蒲×青冈）杂交区潜在过程的深入了解

传统的杂交区模型假设杂交适应性相对较低，因此更多地关注种间基因流而不是杂交扩散。因此，当杂种具有较高的适应度和自主扩散的潜力时，我们对杂种扩散或重复的局部杂种形成对于维持杂种区是否更重要的了解有限。入侵性杂交香蒲香蒲 (Typha × glauca) 占据了北美洲东北部广阔的杂交区，与它的祖先香蒲 (T. latifolia) 和香蒲 (T. angustifolia) 同域分布。我们在母本相对稀有的广阔空间范围内描述了三个类群的遗传多样性和遗传结构，并测试了这样的假设：杂交种比其祖先物种显示出更强的基因流动证据，特别是在受干扰的地点（沟渠）中。已建成的湿地。对这一假设的支持表明，对于维持混合区来说，扩散比重复的局部形成更重要。在每个分类单元内，沟渠之间的遗传分化与湿地之间的遗传分化相当，尽管沟渠中的克隆丰富度始终较高，表明种子建立更频繁。与任一祖先物种相比，杂交种中跨位点的遗传结构更为明显。总体而言，我们的数据反映了杂种中相对较低的基因流，并表明杂种更有可能在原位产生而不是从其他地点引入。尽管入侵的 T. × glauca 具有很高的适应度及其自主潜力，但在维持这个混合区方面，局部过程似乎比扩散更重要。

更新日期：2020-03-18

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