Deep phylogeographic structuring of populations of the trapdoor spider Moggridgea tingle (Migidae) from southwestern Australia: evidence for long-term refugia within refugia

Southwestern Australia has been recognized as a biodiversity hotspot of global significance, and it is particularly well known for its considerable diversity of flowering plant species. Questions of interest are how this region became so diverse and whether its fauna show similarly diverse patterns of speciation. Here we have carried out a phylogeographic study of trapdoor spiders (Migidae: Moggridgea), a presumed Gondwanan lineage found in wet forest localities across southwestern Australia. Phylogenetic, molecular clock and population genetic analyses of mitochondrial (mtDNA) COI gene and ITS rRNA (internal transcribed spacer) data revealed considerable phylogeographic structuring of Moggridgea populations, with evidence for long-term (> 3 million years) isolation of at least nine populations in different geographic locations, including upland regions of the Stirling and Porongurup Ranges. High levels of mtDNA divergence and no evidence of recent mitochondrial gene flow among valle...

澳大利亚西南部已被认定为具有全球重要性的生物多样性热点区域，更以其极为丰富的显花植物物种多样性而享誉全球。本研究聚焦两大核心科学问题：其一，该区域何以演化出如此丰富的生物多样性；其二，其动物类群是否同样呈现出多样化的物种形成模式。为此，我们针对陷阱蛛（Migidae: *Moggridgea*）开展了系统地理学研究——该类群被认为属于冈瓦纳古陆起源支系，广泛分布于澳大利亚西南部的湿润森林生境中。通过对线粒体DNA（mtDNA）的COI基因以及ITS rRNA（内部转录间隔区，internal transcribed spacer）序列开展系统发育分析、分子钟分析与种群遗传学分析，结果显示*Moggridgea*种群存在显著的系统地理学结构，证据表明至少9个分布于不同地理区域（包括斯特灵岭与波龙古普岭的高地）的种群已发生了300万年以上的长期隔离。研究同时发现，该类群各种群间线粒体DNA分化程度极高，且未观测到近期存在线粒体基因流的迹象，在山谷（原文表述未完成）...