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The interplay of colour and bioacoustic traits in the differentiation of a Southeast Asian songbird complex
Molecular Ecology ( IF 4.9 ) Pub Date : 2020-11-01 , DOI: 10.1111/mec.15718
Chyi Yin Gwee 1 , Qiao Le Lee 1 , Simon P Mahood 2, 3 , Hung Le Manh 4 , Robert Tizard 5 , Krairat Eiamampai 6 , Philip D Round 7 , Frank E Rheindt 1
Affiliation  

Morphological traits have served generations of biologists as a taxonomic indicator, and have been the main basis for defining and classifying species diversity for centuries. A quantitative integration of behavioural characters, such as vocalizations, in studies on biotic differentiation has arisen more recently, and the relative importance of these different traits in the diversification process remains poorly understood. To provide a framework within which to interpret the evolutionary interplay between morphological and behavioural traits, we generated a draft genome of a cryptic Southeast Asian songbird, the limestone wren‐babbler Napothera crispifrons. We resequenced whole genomes of multiple individuals of all three traditional subspecies and of a distinct leucistic population. We demonstrate strong genomic and mitochondrial divergence among all three taxa, pointing to the existence of three species‐level lineages. Despite its great phenotypic distinctness, the leucistic population was characterized by shallow genomic differentiation from its neighbour, with only a few localized regions emerging as highly diverged. Quantitative bioacoustic analysis across multiple traits revealed deep differences especially between the two taxa characterized by limited plumage differentiation. Our study demonstrates that differentiation in these furtive songbirds has resulted in a complex mosaic of colour‐based and bioacoustic differences among populations. Extreme colour differences can be anchored in few genomic loci and may therefore arise and subside rapidly.

中文翻译:

颜色和生物声学特性在东南亚鸣禽复合体分化中的相互作用

形态特征已成为世代生物学家的分类指标,并且已经成为定义和分类物种多样性的主要基础。在生物分化研究中,行为特征(如发声)的定量整合近来出现了,而这些不同特征在多样化过程中的相对重要性仍然知之甚少。为了提供一个框架,以解释形态特征和行为特征之间的进化相互作用,我们生成了一种隐秘的东南亚鸣禽的基因组草图,该石灰石w是鸣叫的Napothera crispifrons。我们对所有三个传统亚种的多个个体和一个不同的白血病人群的整个基因组进行了重新测序。我们证明了所有三个分类单元之间强烈的基因组和线粒体差异,表明存在三个物种级谱系。尽管具有明显的表型差异,但白血病人群的特征是与邻居的基因组差异较小,只有少数局部地区出现高度分化。跨多个性状的定量生物声学分析显示出深厚的差异,尤其是在以有限的羽毛分化为特征的两个分类群之间。我们的研究表明,这些隐性鸣禽的分化导致种群之间基于颜色和生物声学差异的复杂镶嵌。
更新日期:2020-12-28
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