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Insights into speciation and species delimitation of closely related eucalypts using an interdisciplinary approach

机译：利用跨学科方法探讨了密切相关桉树的形态和物种划界

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Speciation is a central process in evolutionary biology and is responsible for the diversity of life on Earth. Although there has been much progress in evolutionary research over the past 150 years, understanding the many facets of speciation remains a challenge. In this synthesis, I focus on the use of an interdisciplinary approach to examine speciation and species delimitation in a group of closely related eucalypts called the green ashes (Eucalyptus subgenus Eucalyptus section Eucalyptus). The green ashes comprise tall trees on fertile soils (e.g. the tallest angiosperm in the world, E. regnans), as well as medium trees and mallees on low-nutrient soils. Previous phylogenetic and population-genetics analyses based on genome-wide scans showed that species boundaries in the green ashes are not always consistent with classifications based on morphology and there was evidence of gene flow across lineages. Genomic analyses also suggested that the green ashes were at varying stages of speciation, with some species being highly genetically differentiated, whereas others were at earlier stages on the speciation continuum. A previous common garden study showed that inter-specific differences in seedling traits were significant, with traits such as leaf width being highly plastic across resource treatments for most species. Overall, this synthesis demonstrated that an interdisciplinary approach incorporating phylogenomics, population genomics and a common garden experiment can provide insights into speciation and species delimitation in the green ash eucalypts. Such an approach may be useful in understanding the evolutionary history of other closely related species in Eucalyptus, as well as other groups of organisms.
机译：形态是进化生物学的核心过程，并负责地球上的生命的多样性。虽然在过去的150年里，在进化研究方面存在很大进展，但了解品种的许多方面仍然是一个挑战。在这种合成中，我专注于使用跨学科方法来检查一组密切相关的桉树的物种和物种划界（桉树亚桉树桉树桉树）。绿色灰烬在肥沃的土壤中构成了高大的树木（例如，世界上最高的高血管植物，E. Regnans）以及中草和低营养土壤的野生。基于基因组扫描的先前的系统发育和群体 - 遗传学分析表明，绿色灰烬中的物种边界并不总是与基于形态学的分类一致，并且存在跨谱系的基因流动的证据。基因组分析还表明，绿色灰烬处于不同的形态阶段，有些物种高度遗传分化，而其他物种在物种连续体上较早的阶段。先前的常见花园研究表明，幼苗特征的特异性差异很大，具有诸如大多数物种的资源治疗中的叶宽等特性。总体而言，这种合成证明，掺入文学或普通园区实验的跨学科方法可以在绿色灰桉树中提供对物种和物种划界的见解。这种方法可用于理解桉树和其他生物组中其他密切相关的物种的进化史。

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