• Admixture is a mechanism by which species of long-lived plants may acquire novel alleles. However, the potential role of admixture in the origin and maintenance of tropical plant diversity is unclear. We ask whether admixture occurs in an ecologically important clade of Eschweilera (Parvifolia clade, Lecythidaceae), which includes some of the most widespread and abundant tree species in Amazonian forests.
• Using target capture sequencing, we conducted a detailed phylogenomic investigation of 33 species in the Parvifolia clade and investigated specific hypotheses of admixture within a robust phylogenetic framework.
• We found strong evidence of admixture among three ecologically dominant species, E. coriacea, E. wachenheimii and E. parviflora, but a lack of evidence for admixture among other lineages. Accepted species were largely distinguishable from one another, as was geographic structure within species.
• We show that hybridization may play a role in the evolution of the most widespread and ecologically variable Amazonian tree species. While admixture occurs among some species of Eschweilera, it has not led to widespread erosion of most species’ genetic or morphological identities. Therefore, current morphological based species circumscriptions appear to provide a useful characterization of the clade's lineage diversity.

中文翻译：

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亚马逊热带雨林树种中的混合物可能很广泛

• 混合物是长寿植物物种获得新等位基因的一种机制。然而，混合物在热带植物多样性的起源和维持中的潜在作用尚不清楚。我们询问混合物是否发生在具有生态重要性的Eschweilera进化枝（Parvifolia clade，Lecythidaceae）中，其中包括亚马逊森林中一些最广泛和最丰富的树种。
• 使用目标捕获测序，我们对 Parvifolia 进化枝中的 33 个物种进行了详细的系统发育研究，并在稳健的系统发育框架内研究了混合物的特定假设。
• 我们发现了三种生态优势物种E之间混合的有力证据。栀子花_ _ _ wachenheimii和E . parviflora，但缺乏与其他谱系混合的证据。被接受的物种在很大程度上可以相互区分，物种内的地理结构也是如此。
• 我们表明，杂交可能在最广泛和生态可变的亚马逊树种的进化中发挥作用。虽然某些埃施韦莱拉物种之间存在混合，但它并未导致大多数物种的遗传或形态特征的广泛侵蚀。因此，当前基于形态学的物种限制似乎为进化枝的谱系多样性提供了有用的表征。