Recovering the evolutionary history of crowned pigeons (Columbidae: Goura): Implications for the biogeography and conservation of New Guinean lowland birds
Recovering the evolutionary history of crowned pigeons (Columbidae: Goura): Implications for the biogeography and conservation of New Guinean lowland birds
复制标题
DOI：
10.1016/j.ympev.2017.11.022
复制
发表时间：
2018-03-01
影响因子：
4.1
通讯作者：
Thebaud, Christophe
中科院分区：
文献类型：
--
作者：
Bruxaux, Jade;Gabrielli, Maeva;Thebaud, Christophe
评估移民和多样化对物种多样性积累的相对贡献是理解历史进程在物种丰富地区驱动生物地理和多样化模式中的作用的关键。在这里，我们研究了殖民化、原地物种形成和灭绝历史是如何产生Goura冠鸽（Columbidae）的今天分布和多样性的。Goura冠鸽是一组大型森林栖息鸽，由四个已知的物种组成，都是新几内亚特有的。我们使用基于历史博物馆样本的综合地理和分类采样，以及浅枪枪测序，生成完整的有丝分裂基因组，核糖体簇和独立的核保守DNA元件。我们独立地使用这些数据集来重建分子系统发育。发散时间估计仅使用线粒体数据获得。所有的分析结果都表明，在Goura属中存在相似的遗传分化，并将目前已知的四个物种恢复为单系类群，这为基于羽毛特征差异的近期分类变化提供了支持。这四个物种被归为两对强有力的姐妹物种，它们以前不被认为是近亲：Goura sclaterii与Goura cristata， Goura victoria与Goura scheepmakeri。虽然Goura谱系的地理起源仍然难以捉摸，但5.73 Ma的树冠年龄与新几内亚最近多样化的现代物种多样性是一致的。虽然新几内亚中部科迪勒拉的造山运动一定在推动古拉的多样化方面发挥了作用，但跨屏障扩散似乎比迁移更有可能解释导致目前四个物种的物种形成事件。我们的研究结果也具有重要的保护意义。未来对Goura物种保护状况的评估应考虑del Hoyo和Collar提出的分类修订后的威胁水平（HBW和BirdLife International图解清单1：非雀鸟，2014），我们表明基因组数据完全支持。特别是，从G. scheepmakeri中区分G. sclaterii似乎特别相关。
Assessing the relative contributions of immigration and diversification into the buildup of species diversity is key to understanding the role of historical processes in driving biogeographical and diversification patterns in species-rich regions. Here, we investigated how colonization, in situ speciation, and extinction history may have generated the present-day distribution and diversity of Goura crowned pigeons (Columbidae), a group of large forest-dwelling pigeons comprising four recognized species that are all endemic to New Guinea. We used a comprehensive geographical and taxonomic sampling based mostly on historical museum samples, and shallow shotgun sequencing, to generate complete mitogenomes, nuclear ribosomal clusters and independent nuclear conserved DNA elements. We used these datasets independently to reconstruct molecular phylogenies. Divergence time estimates were obtained using mitochondrial data only. All analyses revealed similar genetic divisions within the genus Goura and recovered as monophyletic groups the four species currently recognized, providing support for recent taxonomic changes based on differences in plumage characters. These four species are grouped into two pairs of strongly supported sister species, which were previously not recognized as close relatives: Goura sclaterii with Goura cristata, and Goura victoria with Goura scheepmakeri. While the geographical origin of the Goura lineage remains elusive, the crown age of 5.73 Ma is consistent with present-day species diversity being the result of a recent diversification within New Guinea. Although the orogeny of New Guinea's central cordillera must have played a role in driving diversification in Goura, cross-barrier dispersal seems more likely than vicariance to explain the speciation events having led to the four current species. Our results also have important conservation implications. Future assessments of the conservation status of Goura species should consider threat levels following the taxonomic revision proposed by del Hoyo and Collar (HBW and BirdLife International illustrated checklist of the birds of the world 1: non-passerines, 2014), which we show to be fully supported by genomic data. In particular, distinguishing G. sclaterii from G. scheepmakeri seems to be particularly relevant.