Abstract：
Centaurea subsection Phalolepis has been thoroughly analyzed in previous studies using microsatellites in four centers of speciation: Anatolia, Greece, the Italian Peninsula and the Iberian Peninsula. Evidence suggests a correlation between taxon diversity and mountains. This group constituted a good case study for examining the mountain-geobiodiversity hypothesis (MGH), which explains the possible reasons for the many radiations occurring in mountains across the world. We combined all the datasets and carried out analyses of their genetic structure to confirm the species of subsect. Phalolepis are grouped according to a geographic pattern. We then checked whether climatic fluctuations favored the \"species pump\" hypothesis in the mountains by using the Climatic Stability Index (CSI). Finally, the relief of the terrain was tested against the rate of allopatric speciation by region by means of Terrain Ruggedness Index and environmental gradients through our new Climate Niche Breadth Index. Our results supported the MGH hypothesis and confirmed that the main triggers, namely altitudinal zonation, climatic oscillations and rugged terrain, must be present for the development of a radiation.
摘要：
Centaurea小节Phalolepis在以前的研究中已经在四个物种形成中心使用微卫星进行了彻底分析：安纳托利亚，希腊,意大利半岛和伊比利亚半岛。证据表明分类单元多样性与山脉之间存在相关性。这个小组构成了一个很好的案例研究，用于研究山地地理多样性假说（MGH），这解释了世界各地山区发生许多辐射的可能原因。我们合并了所有数据集，并对其遗传结构进行了分析，以确认亚种的物种。Phalolepis根据地理模式进行分组。然后，我们使用气候稳定性指数（CSI）检查了气候波动是否有利于山区的“物种泵”假设。最后,通过我们新的气候生态宽度指数，通过地形粗糙度指数和环境梯度，测试了地形的起伏与地区的异域物种形成率。我们的结果支持MGH假设，并证实了主要的触发因素，即海拔分区，气候振荡和崎岖的地形，必须出现在辐射的发展中。
