Implications of landscape evolution and climate fluctuation on bird species diversification in Neotropics

Among several factors proposed as drivers of species diversification in the American tropics, the riverine barriers hypothesis plays a central role in Amazonian biogeography, being observed in many species. Although the hypothesis has great evolutionary importance, some species deviate from the expected biogeographic pattern. Their evolutionary histories are better explained when considering climatic oscillations or joint action of climatic fluctuations and river dynamics. Here, we used reduced representation genome sequencing and species distribution models to better understand the implications of landscape dynamics and climate shifts on species diversification in the Neotropics. The blue-crowned Manakin (Lepidothrix coronata) has one of the widest distributions amongst Manakin, with remarkable phenotypic variation across its distribution, thus an excellent model for this sort of study. We found evidence for the existence of four, geographically structured, evolutionarily independent l...在美洲热带地区被提出的诸多物种多样化驱动因子中，河流屏障假说（riverine barriers hypothesis）在亚马逊生物地理学中占据核心地位，且已在众多物种中得到验证。尽管该假说具有重要的进化意义，但部分物种未遵循其预期的生物地理格局。当纳入气候波动，或是气候波动与河流动态的共同调控作用时，这些物种的进化历史便能得到更合理的解释。本研究采用简化基因组测序（reduced representation genome sequencing）与物种分布模型（species distribution models），以期深入解析景观动态与气候变化对新热带区（Neotropics）物种多样化的影响。蓝顶娇鹟（blue-crowned Manakin，学名Lepidothrix coronata）是娇鹟类群中分布范围最广的物种之一，其分布区内存在显著的表型变异，因此是此类研究的理想模型类群。本研究发现存在四个具有地理结构、进化独立性的[原文未完整表述]的证据。