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Bayesian island biogeography in a continental setting: the Rand Flora case

机译:大陆环境下的贝叶斯岛屿生物地理:兰德植物群案例

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摘要

We here explore the use of a Bayesian approach to island biogeography for disentangling the evolutionary origins of a continental-scale floristic pattern, the enigmatic ‘Rand Flora’. The existence of disjunct distributions across many plant lineages between Macaronesia–northwest Africa, Horn of Africa–southern Arabia and east–south Africa has long intrigued botanists, but only now can we start analysing it within a statistical framework.Phylogenetic and distributional data from 13 plant lineages exhibiting this disjunct distribution were analysed to estimate area carrying capacities and historical rates of biotic exchange between areas. The results indicate that there has been little exchange between southern Africa and the northern African region, and that this exchange occurred via east Africa. Northwest Africa–Macaronesia shows the smallest carrying capacity but highest dispersal rate with other regions, suggesting that its flora was built up by immigration of lineages, probably from the Mediterranean region and western Asia. In contrast, southern Africa shows the highest carrying capacity and lowest dispersal rate, suggesting a flora formed by in situ diversification.We discuss further improvements of the method for addressing more complex hypotheses, such as asymmetric dispersal between regions or repeated cyclical events.
机译:我们在这里探索使用贝叶斯方法进行岛屿生物地理学的方法,以弄清大陆规模的植物区系,即神秘的“ Rand Flora”的进化起源。长期以来,植物学家对Macaronesia(西北非洲),非洲之角(非洲之角)和南非洲东部之间的许多植物谱系存在不连续的分布,但直到现在,我们才可以在统计框架内对其进行分析。来自13的系统发育和分布数据分析表现出这种分散分布的植物谱系,以估计区域的承载能力和区域之间生物交换的历史速度。结果表明,南部非洲和北部非洲地区之间几乎没有交换,这种交换是通过东部非洲发生的。西北非洲–马卡龙尼亚的承载力最小,但与其他地区的扩散速度最高,这表明其植物群是由可能来自地中海地区和西亚的血统移民建立的。相比之下,南部非洲显示出最高的承载能力和最低的扩散速度,表明通过原位多样化形成的菌群。我们讨论了解决更复杂假设(例如区域之间的不对称扩散或重复的周期性事件)的方法的进一步改进。

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