Santos Bernardo F, Scherrer Marcus V, Loss Ana Carolina
a Department of Entomology , National Museum of Natural History , Washington, DC , USA.
b Universidade Federal do Espírito Santo , Vitória , ES , Brazil.
Mitochondrial DNA A DNA Mapp Seq Anal. 2018 Dec;29(8):1284-1292. doi: 10.1080/24701394.2018.1445242. Epub 2018 Mar 8.
The Atlantic Forest is one of the world's top biodiversity hotspots, but the diversification processes of its biota are still poorly known, with competing models attributing dominant roles to either Quaternary climatic changes or geographic barriers. Many studies identify the Doce river as a major phylogeographic break, but the reasons for this phenomenon are highly debated. Here we test the predictions of the refugial and barrier models for a common species of praying mantis, Miobantia fuscata, focusing in the areas immediately south and north of the Doce river. Our analyses show high intraspecific genetic diversity, deep coalescence times and no evidence for recent population expansion. Phylogeographic structure is inconsistent with a refugial hypothesis. Significant gene flow between northern and southern populations also conflicts with a strong role for geographic barriers. This study highlights the need for considering invertebrate taxa to infer recent landscape changes, and points towards a more complex picture of genetic diversification in the Atlantic Forest.
大西洋森林是世界上生物多样性热点地区之一，但其生物群的多样化过程仍鲜为人知，相互竞争的模型将主导作用归因于第四纪气候变化或地理屏障。许多研究将多西河确定为主要的系统地理学断点，但对这一现象的原因存在激烈争论。在这里，我们针对一种常见的螳螂——褐拟刀螳（Miobantia fuscata），检验避难所模型和屏障模型的预测，重点关注多西河南部和北部的区域。我们的分析显示出高种内遗传多样性、深 coalescence 时间，且没有近期种群扩张的证据。系统地理学结构与避难所假说不一致。南北种群之间的显著基因流动也与地理屏障的强大作用相冲突。这项研究强调了在推断近期景观变化时考虑无脊椎动物类群的必要性，并指出了大西洋森林遗传多样化的更复杂情况。
