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The roles of vicariance and dispersal in the differentiation of two species of the Rhinella marina species complex.
Molecular Phylogenetics and Evolution ( IF 3.6 ) Pub Date : 2019-12-28 , DOI: 10.1016/j.ympev.2019.106723
Adam Bessa-Silva 1 , Marcelo Vallinoto 1 , Iracilda Sampaio 2 , Oscar A Flores-Villela 3 , Eric N Smith 4 , Fernando Sequeira 5
Affiliation  

The high levels of Neotropical biodiversity are commonly associated with the intense Neogene-Quaternary geological events and climate dynamics. Here, we investigate the evolutionary history of two species of Neotropical closely related amphibians (R. horribilis and R. marina). We combine published data with new mitochondrial DNA sequences and multiple nuclear markers, including 12 microsatellites. The phylogenetic analyses showed support for grouping the samples in two main clades; R. horribilis (Central America and Mexico) and R. marina (South America east of the Andes). However, the phylogenetic inferences also show an evident mito-nuclear discordance. We use Approximate Bayesian Computation (ABC) to test the role of different events in the diversification between the two groups recovered. We found that both species were affected primarily by a recent Pleistocene divergence, which was similar to the divergence estimate revealed by the Isolation-with-Migration model, under persistent bidirectional gene flow through time. We provide the first evidence that R. horribilis is differentiated from the South American R. marina at the nuclear level supporting the taxonomic status of R. horribilis, which has been controversial for more than a century.

中文翻译:

方差和扩散在莱茵兰滨海物种复合体的两个物种的分化中的作用。

新热带生物多样性的高水平通常与新近纪-第四纪强烈的地质事件和气候动态有关。在这里,我们调查了两个新近性密切相关的两栖动物(R. horribilis和R. marina)的进化历史。我们将发布的数据与新的线粒体DNA序列和包括12个微卫星在内的多个核标记相结合。系统发育分析表明支持将样品分为两个主要进化枝。R. horribilis(中美洲和墨西哥)和R. marina(安第斯山脉以南的南美)。但是,系统发育推论也显示出明显的线粒体核不和谐。我们使用近似贝叶斯计算(ABC)来检验不同事件在恢复的两组之间的多元化中的作用。我们发现这两个物种主要受到最近的更新世发散的影响,这与通过时间进行的持久双向基因流下的“隔离随迁”模型揭示的发散估计相似。我们提供的第一个证据是,在支持R. horribilis的分类学地位的核水平上,R。horribilis与南美R. marina有所区别,这已经有一个多世纪的历史了。
更新日期:2019-12-29
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