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Reticulate Evolutionary History in a Recent Radiation of Montane Grasshoppers Revealed by Genomic Data
bioRxiv - Evolutionary Biology Pub Date : 2021-01-13 , DOI: 10.1101/2021.01.12.426362
Vanina Tonzo , AdriÀ Bellvert , Joaquín Ortego

Inferring the ecological and evolutionary processes underlying lineage and phenotypic diversification is of paramount importance to shed light on the origin of contemporary patterns of biological diversity. However, reconstructing phylogenetic relationships in recent evolutionary radiations represents a major challenge due to the frequent co-occurrence of incomplete lineage sorting and introgression. In this study, we combined high throughput sequence data (ddRADseq), geometric morphometric information, and novel phylogenetic inference methods that explicitly account for gene flow to infer the evolutionary relationships and the timing and mode of diversification in a complex of Ibero-Maghrebian montane grasshoppers of the subgenus Dreuxius (genus Omocestus). Our analyses supported the phenotypic distinctiveness of most sister taxa, two events of historical introgression involving lineages at different stages of the diversification continuum, and the recent Pleistocene origin (< 1 Ma) of the complex. Phylogenetic analyses did not recover the reciprocal monophyly of taxa from Iberia and northwestern Africa, supporting overseas migration between the two continents during the Pleistocene. Collectively, these results indicate that periods of isolation and secondary contact linked to Pleistocene glacial cycles likely contributed to both allopatric speciation and post divergence gene flow in the complex. This study exemplifies how the integration of multiple lines of evidence can help to reconstruct complex histories of reticulated evolution and highlights the important role of Quaternary climatic oscillations as a diversification engine in the Ibero-Maghrebian biodiversity hotspot.

中文翻译:

基因组数据揭示的山Mont最近辐射中的网状进化历史

推断世系和表型多样化背后的生态和进化过程,对于阐明当代生物多样性模式的起源至关重要。然而,由于不完整的谱系分类和基因渗入经常同时发生,在最近的进化辐射中重建系统发生关系代表了一项重大挑战。在这项研究中,我们结合了高通量序列数据(ddRADseq),几何形态信息和新颖的系统发育推断方法,这些方法明确地说明了基因流,以推断进化关系以及多样化的时间和方式在伊比利亚-马格里布山地蝗虫的复合体中Dreuxius属(Omocestus属)。我们的分析支持大多数姐妹类群的表型独特性,历史性渗入的两个事件涉及多样化连续体不同阶段的宗族,以及该复合体的最近更新世起源(<1 Ma)。系统发育分析未能恢复伊比利亚和西北非洲的分类单元的倒数,这支持了更新世期间两大洲之间的海外迁移。总的来说,这些结果表明,与更新世冰川周期相关的隔离期和二次接触期可能有助于复杂的异相物种形成和后发基因流。
更新日期:2021-01-14
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