Isolation by environment and recurrent gene flow shaped the evolutionary history of a continentally distributed Neotropical treefrog
Isolation by environment and recurrent gene flow shaped the evolutionary history of a continentally distributed Neotropical treefrog
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DOI：
10.1111/jbi.14035
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发表时间：
2020-12-15
影响因子：
3.9
通讯作者：
Garda, Adrian A.
中科院分区：
文献类型：
--
作者：
Camurugi, Felipe;Gehara, Marcelo;Garda, Adrian A.
AIM植物地理学研究表明，景观的历史和当前变化如何塑造动物和植物物种遗传多样性的地理分布。特别是，对于开放地层的对角线（DOF），在第四纪期间第三纪和气候振荡期间，巴西中部高原（CBP）的隔室化经常被调用以解释生物生物分类的起源和当前模式。我们调查了景观如何变化和气候振荡塑造了南美广泛的Treefog的分布和多样化历史。南美的开放地层对角线（包括Cainga，Cerrado，Cerrado和Chaco Biomes.taxon Treefog Boana boana boana raniceps.methods我们使用了288 frocus frocus frocus frocs interys forogiogsition。 分配。我们使用人口分配分析，物种分布模型，历史人口统计模型，近似贝叶斯计算和景观遗传分析来检验多元化的替代假设。回归我们发现，在中期持续基因流动期间，我们发现了两个遗传谱系，它们在中期差异。近似贝叶斯计算支持隔离的情况，直到最后一次冰川最大值，随后是巴西东北部的最新人口扩大以及南美西南部的稳定性。通过环境隔离是人群之间遗传距离的最佳预测指标，这与其不同的环境壁ni。由于Boana Raniceps是一种低地物种，CBP中的陡峭斜率可能限制了足够的基因流动以维持种群差异。我们发现了在最后一次冰川最大值期间大范围收缩的证据，这增加了气候变化协同作用的可能性以及在调节迁移时的CBP分区化的可能性。我们的发现结论我们的发现突出了景观和气候变化如何影响Dof Biota的多样化。过去的气候波动和地形所引起的环境阻力作用着，形成了基因流的半透明障碍，从而促进了大陆分布的物种的种分内分化。
Aim Phylogeographic studies show how historical and current changes in landscapes shape the geographic distribution of genetic diversity in species of animals and plants. In particular, for the species of the Diagonal of Open Formations (DOF), the compartmentalization of the Central Brazilian Plateau (CBP) during the Tertiary and climatic oscillations during the Quaternary have often been invoked to explain the origin and current patterns of biodiversity. We investigated how landscape changes and climatic oscillations shaped the distribution and diversification history of a widespread South American treefrog.Location South American Diagonal of Open Formations (DOF) including Caatinga, Cerrado, and Chaco biomes.Taxon Treefrog Boana raniceps.Methods We used a multi-locus dataset from 288 individual frogs collected at 115 localities throughout most of the species' distribution. We used population assignment analysis, species distribution models, historical demography models, approximate Bayesian computation and landscape genetic analyses to test alternative hypotheses of diversification.Results We found two genetic lineages that diverged during the mid-Pleistocene with continued gene flow. Approximate Bayesian computation supported a scenario of isolation with migration until the Last Glacial Maximum, followed by more recent population expansion in north-eastern Brazil and stability at the southwest in South America. Isolation by environment was the best predictor of genetic distance between populations, which is in accordance with their different environmental niches. As Boana raniceps is a lowland species, steep slopes in the CBP likely restrained gene flow enough to sustain population divergence. We found evidence for major range contraction during the Last Glacial Maximum, raising the possibility of synergic action of climate change and the CBP compartmentalization in regulating migration.Main conclusions Our findings highlight how landscape and climatic changes can shape the diversification of DOF biota. Past climatic fluctuations and environmental resistance due to topography acted in concert, forming a semipermeable barrier to gene flow, promoting intraspecific differentiation in a continentally distributed species.