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A molecular genetic investigation into secondary contact and gene flow in island sister taxa.

机译：分子遗传学调查岛姐妹分类单元中的二级接触和基因流。

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摘要

Investigations of colonization patterns have contributed to fundamental advances in evolutionary and ecological theory. Once populations have differentiated, secondary contact can lead either to the reinforcement of species boundaries or interbreeding. Its effects on the maintenance of biodiversity are not well known. Archipelagos like the Philippines are useful for studying the relationships of secondary contact because of their distinct geographic boundaries and simpler land vertebrate biota. A genus-level phylogeny of Philippine Tailorbirds (Passeriformes: Cisticolidae) inferred a deep split between two sister species on the island of Luzon. Some populations of Orthotomus chloronotus and O. derbianus co-occur parts of their range but they are phenotypically distinct. Because of that distinctiveness, these species were traditionally considered evolutionarily independent. Recently however, molecular and morphological evidence found evidence of gene flow between them (Sheldon et al. 2012). To investigate the extent of reproductive isolation between these species, molecular data was collected from populations across Luzon Island and three classes of DNA markers were sequenced: mitochondrial, autosomal, and sex-linked. The sex-linked chromosome was Green-backed Orthotomus chloronotus and gray-backed O. derbianus are paraphyletic at all loci; there is complete introgression in the sex chromosome, strong population structure in autosomal chromosomes, and strong phylogenetic structure in mitochondrial genes. These findings contradict taxonomic classification; allopatric populations of green- and gray-backed birds (respectively North and South Luzon) are genetically distinct from the sympatric population in Central Luzon. The southern population shows early signs of diverging from the rest of Luzon Orthotomus and coincides with the limits of the green-backed phenotype. The sympatric zone, Central Luzon, shows no signs of past or present genetic isolation, and this population is exchanging significant amounts of alleles with North Luzon green-backed birds. The dataset finds no evidence of genes segregating by plumage in Central Luzon. This leaves unanswered questions about the emergence of the derived phenotype, whether plumage is stochastic or under selective pressure, and the amount of data necessary to statistically evaluate complicated evolutionary hypotheses in natural populations.
机译：对殖民化模式的研究为进化论和生态学理论的根本发展做出了贡献。一旦种群分化，次生接触可导致物种边界的增强或杂交。它对维持生物多样性的影响尚不清楚。像菲律宾这样的群岛，由于其独特的地理边界和较简单的陆地脊椎动物群落，可用于研究二级接触的关系。菲律宾Tailbirdbirds（Passeriformes：Cisticolidae）属属的系统发育推断在吕宋岛上的两个姊妹物种之间发生了深层分裂。绿孔雀麦草和黑麦草的某些种群同时出现在它们的范围内，但是它们在表型上是不同的。由于这种独特性，传统上认为这些物种在进化上是独立的。然而，最近，分子和形态学证据发现了它们之间基因流动的证据（Sheldon等，2012）。为了研究这些物种之间的生殖隔离程度，从吕宋岛上的种群中收集了分子数据，并对三类DNA标记进行了测序：线粒体，常染色体和性相关。性相关的染色体是绿背的Orthotomus chloronotus和灰背的O. derbianus在所有基因座上都是共生的。性染色体上有完全的基因渗入，常染色体上有很强的种群结构，线粒体基因上有很强的系统发育结构。这些发现与分类学分类相抵触。从遗传上讲，绿背和灰背鸟类（分别是吕宋岛的北部和南部）的同种异体种群与吕宋中部的同胞种群在遗传上是不同的。南部人口显示出与吕宋正畸动物其余部分不同的早期迹象，并且与绿底表型的限制相吻合。吕宋中部同胞带没有显示过去或现在的遗传隔离迹象，该种群正在与北部吕宋绿背鸟交换大量等位基因。该数据集未发现在吕宋岛中部通过羽毛分离基因的证据。这就留下了关于衍生表型的出现，羽毛是随机的还是在选择性压力下，以及对自然种群中的复杂进化假设进行统计学评估所必需的数据量等尚未解决的问题。

著录项

  • 作者

    Jones, Robin M.;

  • 作者单位

    University of Kansas.;

  • 授予单位 University of Kansas.;
  • 学科 Biology Evolution and Development.
  • 学位 M.A.
  • 年度 2013
  • 页码 49 p.
  • 总页数 49
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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