We present the largest comparative biogeographical analysis that has complete coverage of Australia's geography (20 phytogeographical subregions), using the most complete published molecular phylogenies to date of large Australian plant clades (Acacia, Banksia and the eucalypts). Two distinct sets of areas within the Australian flora were recovered, using distributional data from the Australasian Virtual Herbarium (AVH) and the Atlas of Living Australia (ALA): younger Temperate, Eremaean and Monsoonal biomes, and older southwest + west, southeast and northern historical biogeographical regions. The analyses showed that by partitioning the data into two sets, using either a Majority or a Frequency method to select taxon distributions, two equally valid results were found. The dataset that used a Frequency method discovered general area cladograms that resolved patterns of the Australian biomes, whereas if widespread taxa (Majority method, with >50% of occurrences outside a single subregion) were removed the analysis then recovered historical biogeographical regions. The study highlights the need for caution when processing taxon distributions prior to analysis as, in the case of the history of Australian phytogeography, the validity of both biomes and historical areas have been called into question.

中文翻译：

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植物地理模式是否揭示了生物群落或生物区域？

我们使用迄今为止最完整的澳大利亚大型植物进化枝（金合欢、班克西亚和桉树）的分子系统发育，展示了最大的比较生物地理学分析，该分析完全覆盖了澳大利亚的地理（20 个植物地理学子区域）。使用来自澳大利亚虚拟植物标本馆 (AVH) 和澳大利亚生活地图集 (ALA) 的分布数据，恢复了澳大利亚植物群中两组不同的区域：较年轻的温带、埃雷马和季风生物群落，以及较旧的西南+西部、东南和北部历史生物地理区域。分析表明，通过将数据分成两组，使用多数或频率方法来选择分类群分布，发现了两个同样有效的结果。使用频率方法的数据集发现了解析澳大利亚生物群落模式的一般区域分支图，而如果删除了广泛的分类群（多数方法，在单个子区域之外出现了 >50% 的事件），则分析然后恢复了历史生物地理区域。该研究强调在分析之前处理分类群分布时需要谨慎，因为就澳大利亚植物地理学的历史而言，生物群落和历史区域的有效性都受到质疑。