Evolutionary impacts of introgressive hybridization in a rapidly evolving group of jumping spiders (F. Salticidae, Habronattus americanus group)
Evolutionary impacts of introgressive hybridization in a rapidly evolving group of jumping spiders (F. Salticidae, Habronattus americanus group)
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渐渗杂交对快速进化的跳蛛群体（F. Salticidae，Habronattus americanus 群）的进化影响
DOI：
10.1016/j.ympev.2021.107165
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发表时间：
2021
影响因子：
4.1
通讯作者：
Hedin, M.
中科院分区：
文献类型：
--
作者：
Bougie, T.C.;Brelsford, A.;Hedin, M.
渐入性杂交在多个分类水平上是影响进化模式的强大力量。我们的目的是了解基因渗入是如何影响跳蛛物种复合体的物种形成和多样化的。美洲habronattus美洲亚群是跳蛛的一个新近扩散的类群，在更新世冰期的假设隔离期之后，这些物种现在开始接触。利用RADseq、超保守元件（UCEs）和形态学数据，采用系统基因组学和聚类方法研究了基因渗入对基因组和形态学的影响。我们使用非度量的多维尺度形态学数据表征了14种独特的物种/形态，其中大多数在我们的系统基因组分析中没有恢复为单系。形态集群和遗传谱系高度不一致，因此地理区域比物种或形态身份更能预测系统发育相关性和基因组相似性。结构分析支持这种模式，揭示了与更大的地理区域相对应的集群。在这个系统中，快速辐射和频繁基因渗入的历史似乎使物种的基因组大部分同质化，而选择的力量保持了不同的雄性形态。GEMMA分析通过识别与不同男性形态相关的snp来支持这一观点。总的来说，我们发现了一个与典型的分岔进化模型不一致的系统，而不是支持一个密切相关的物种通过多个渗入事件一起进化的系统，创造了一个网状的进化历史。
Introgressive hybridization can be a powerful force impacting patterns of evolution at multiple taxonomic levels. We aimed to understand how introgression has affected speciation and diversification within a species complex of jumping spiders. TheHabronattus americanussubgroup is a recently radiating group of jumping spiders, with species now in contact after hypothesized periods of isolation during glaciation cycles of the Pleistocene. Effects of introgression on genomes and morphology were investigated using phylogenomic and clustering methods using RADseq, ultraconserved elements (UCEs), and morphological data. We characterized 14 unique species/morphs using non-metric multidimensional scaling of morphological data, a majority of which were not recovered as monophyletic in our phylogenomic analyses. Morphological clusters and genetic lineages are highly incongruent, such that geographic region was a greater predictor of phylogenetic relatedness and genomic similarity than species or morph identity. STRUCTURE analyses support this pattern, revealing clusters corresponding to larger geographic regions. A history of rapid radiation in combination with frequent introgression seems to have mostly homogenized the genomes of species in this system, while selective forces maintain distinct male morphologies. GEMMA analyses support this idea by identifying SNPs correlated with distinct male morphologies. Overall, we have uncovered a system at odds with a typical bifurcating evolutionary model, instead supporting one where closely related species evolve together connected through multiple introgression events, creating a reticulate evolutionary history.