Notes from the taxonomic disaster zone: Evolutionary drivers of intractable species boundaries in an Australian lizard clade (Scincidae: Ctenotus )
Notes from the taxonomic disaster zone: Evolutionary drivers of intractable species boundaries in an Australian lizard clade (Scincidae: Ctenotus )
复制标题
分类灾难区的注释：澳大利亚蜥蜴进化枝中棘手物种边界的进化驱动因素（Scincidae：Ctenotus）
DOI：
10.1111/mec.17074
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发表时间：
2023
影响因子：
4.9
通讯作者：
Rabosky, Daniel L.
中科院分区：
文献类型：
--
作者：
Prates, Ivan;Hutchinson, Mark N.;Singhal, Sonal;Moritz, Craig;Rabosky, Daniel L.
基因组规模的数据集，复杂的分析技术和概念上的进步不成比例地未能解决某些群体相对于其他群体的物种边界。要了解的过程中，分类的棘手性，我们解剖的物种形成历史的澳大利亚蜥蜴分支，可以说是一个“最坏的情况下”的情况下，在脊椎动物的物种划分：Ctenotus inornatusspecies组，一个分支困扰解耦的遗传和表型断裂，不确定的地理范围，和平行的据称诊断形态特征。我们对数百个地方进行了采样，以产生对种群分化、结构和混合的基因组视角。我们的研究结果显示，猖獗的并系群中的命名类群，无论是形态上的神秘或多型的谱系。距离隔离模式反映了某些假定物种对之间的空间连续分化，但遗传和地理距离在其他对中是解耦的。比较线粒体和核基因树，核基因渗入的测试，和历史人口模型确定不同的候选物种之间的基因流。混合水平与系统发育相关性脱钩;同域物种之间的基因流动往往高于同一物种的近缘种群之间的基因流动。这种基因渗入的特殊模式有助于物种边界模糊，同时也在未来变化。我们的研究结果表明，“分类灾害区”，如C。inornatusspecies组是由物种边界孔隙度的空间变化以及由此产生的遗传和表型变异模式造成的。这项研究提出了杂交物种的起源和持久性的问题，并强调了独特的见解提供的分类群，长期以来一直逃避直接的分类学分类。
Genomic‐scale datasets, sophisticated analytical techniques, and conceptual advances have disproportionately failed to resolve species boundaries in some groups relative to others. To understand the processes that underlie taxonomic intractability, we dissect the speciation history of an Australian lizard clade that arguably represents a “worst‐case” scenario for species delimitation within vertebrates: theCtenotus inornatusspecies group, a clade beset with decoupled genetic and phenotypic breaks, uncertain geographic ranges, and parallelism in purportedly diagnostic morphological characters. We sampled hundreds of localities to generate a genomic perspective on population divergence, structure, and admixture. Our results revealed rampant paraphyly of nominate taxa in the group, with lineages that are either morphologically cryptic or polytypic. Isolation‐by‐distance patterns reflect spatially continuous differentiation among certain pairs of putative species, yet genetic and geographic distances are decoupled in other pairs. Comparisons of mitochondrial and nuclear gene trees, tests of nuclear introgression, and historical demographic modelling identified gene flow between divergent candidate species. Levels of admixture are decoupled from phylogenetic relatedness; gene flow is often higher between sympatric species than between parapatric populations of the same species. Such idiosyncratic patterns of introgression contribute to species boundaries that are fuzzy while also varying in fuzziness. Our results suggest that “taxonomic disaster zones” like theC. inornatusspecies group result from spatial variation in the porosity of species boundaries and the resulting patterns of genetic and phenotypic variation. This study raises questions about the origin and persistence of hybridizing species and highlights the unique insights provided by taxa that have long eluded straightforward taxonomic categorization.