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首页> 外文期刊>Zoological Journal of the Linnean Society >Bayesian Poisson tree processes and multispecies coalescent models shed new light on the diversification of Nawab butterflies in the Solomon Islands (Nymphalidae, Charaxinae, Polyura)
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Bayesian Poisson tree processes and multispecies coalescent models shed new light on the diversification of Nawab butterflies in the Solomon Islands (Nymphalidae, Charaxinae, Polyura)

机译:贝叶斯泊松树过程和多物种合并模型为所罗门群岛(Nymphalidae,Charaxinae,Polyura)Nawab蝴蝶的多样化提供了新的思路。

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摘要

Butterflies of the genus Polyura form a widespread tropical group distributed from Pakistan to Fiji. The rare endemic Polyura epigenes Godman & Salvin, 1888 from the Solomon Islands archipelago represents a case of marked island polymorphism. We sequenced museum specimens of this species across its geographic range to study the phylogeography and genetic differentiation of populations in the archipelago. We used the Bayesian Poisson tree processes and multispecies coalescent models, to study species boundaries. We also estimated divergence times to investigate the biogeographic history of populations. Our molecular species delimitation and nuclear DNA network analyses unambiguously indicate that Malaita populations form an independent metapopulation lineage, as defined in the generalized lineage concept. This lineage, previously ranked as a subspecies, is raised to species rank under the name Polyura bicolor Turlin & Sato, 1995stat.nov. Divergence time estimates suggest that this lineage split from its sister taxon in the late Pleistocene. At this time, the bathymetric isolation of Malaita from the rest of the archipelago probably prevented gene flow during periods of lower sea level, thereby fostering allopatric speciation. The combination of molecular species delimitation methods, morphological comparisons, and divergence time estimation is useful to study lineage diversification across intricate geographic regions.
机译:Polyura属的蝴蝶形成从巴基斯坦分布到斐济的广泛热带群体。所罗门群岛群岛罕见的地方性Polyura表观基因Godman&Salvin,1888年代表了一个明显的岛屿多态性案例。我们对这个物种的博物馆标本在其地理范围内进行了测序,以研究群岛的种群地理系统和遗传分化。我们使用贝叶斯泊松树过程和多物种合并模型来研究物种边界。我们还估计了发散时间,以调查种群的生物地理历史。我们的分子物种定界和核DNA网络分析明确表明,按照广义谱系概念中的定义,Malaita种群形成了一个独立的遗传种群。该血统以前被列为亚种,后来被提升为物种等级,名称为Polyura bicolor Turlin&Sato,1995stat.nov。发散时间估计表明,这个世系与其晚更新世的姊妹类群分开。此时,从群岛的其余部分进行水深隔离,可能阻止了海平面较低时期的基因流动,从而促进了异源物种的形成。分子物种定界方法,形态学比较和发散时间估计的结合对于研究复杂地理区域的谱系多样化很有用。

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