University of Maryland, Baltimore County, Department of Biological Sciences, 1000 Hilltop Circle, Baltimore, MD 21250, USA.
University of Maryland, Baltimore County, Department of Biological Sciences, 1000 Hilltop Circle, Baltimore, MD 21250, USA; University of Maryland, Baltimore County, Department of Mathematics and Statistics, 1000 Hilltop Circle, Baltimore, MD 21250, USA.
Mol Phylogenet Evol. 2019 Feb;131:48-54. doi: 10.1016/j.ympev.2018.10.024. Epub 2018 Oct 25.
Australo-Pacific Petroica robins are known for their striking variability in sexual plumage coloration. Molecular studies in recent years have revised the taxonomy of species and subspecies boundaries across the southwest Pacific and New Guinea. However, these studies have not been able to resolve phylogenetic relationships within Petroica owing to limited sampling of the nuclear genome. Here, we sequence five nuclear introns across all species for which fresh tissue was available. Nuclear loci offer support for major geographic lineages that were first inferred from mtDNA. We find almost no shared nuclear alleles between currently recognized species within the New Zealand and Australian lineages, whereas the Pacific robin radiation has many shared alleles. Multilocus coalescent species trees based on nuclear loci support a sister relationship between the Australian lineage and the Pacific robin radiation-a node that is poorly supported by mtDNA. We also find discordance in support for a sister relationship between the similarly plumaged Rose Robin (P. rosea) and Pink Robin (P. rodinogaster). Our nuclear data complement previous mtDNA studies in suggesting that the phenotypically cryptic eastern and western populations of Australia's Scarlet Robin (P. boodang) are genetically distinct lineages at the early stages of divergence and speciation.
澳大拉西亚吸蜜鹦鹉的性羽颜色变化显著，这是它们为人熟知的特点。近年来的分子研究修订了西南太平洋和新几内亚一带物种和亚种的分类学边界。然而，由于核基因组的采样有限，这些研究未能解决吸蜜鹦鹉内部的系统发育关系。在这里，我们对所有有新鲜组织样本的物种进行了五个核内含子的测序。核基因座支持从 mtDNA 首次推断出的主要地理谱系。我们发现，新西兰和澳大利亚谱系内目前公认的物种之间几乎没有共享的核等位基因，而太平洋罗宾逊辐射则有许多共享的等位基因。基于核基因座的多基因座凝聚种系发生树支持澳大利亚谱系与太平洋罗宾逊辐射之间的姐妹关系——这一节点在 mtDNA 中的支持度较差。我们还发现，在羽色相似的玫瑰吸蜜鹦鹉（P. rosea）和粉红吸蜜鹦鹉（P. rodinogaster）之间，支持姐妹关系的程度存在差异。我们的核数据补充了之前的 mtDNA 研究，表明在澳大利亚猩红吸蜜鹦鹉（P. boodang）的东部和西部表型隐密种群是处于分化和物种形成早期的遗传上截然不同的谱系。
