Neoisoptera repetitively colonised Madagascar after the Middle Miocene climatic optimum-猫眼课题宝

DOI：

10.1101/2021.12.01.470872

发表时间：

2021-12

期刊：

bioRxiv

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Menglin Wang;S. Hellemans;A. Buček;T. Kanao;J. Arora;C. Clitheroe;J. Rafanomezantsoa;B. Fisher

马达加斯加是许多特有植物和动物物种的家园，这是因为它自古以来与其他大陆隔绝。这种独特的动物群包括白蚁的几个谱系，白蚁是一组以在许多陆地生态系统中有机物分解中发挥关键作用而闻名的昆虫。白蚁如何以及何时入侵马达加斯加仍然未知。在这项研究中，我们使用了601个线粒体基因组，其中93个是从马达加斯加样本中产生的，来推断Neoisoptera的全球历史地理学，这是一个包含80%以上所描述的白蚁物种的谱系。我们的研究结果表明，Neoisoptera殖民马达加斯加之间的7至10次独立的中新世期间，8.4-16.6马（95%HPD：6.1-19.9马）。这一时间与新等翅目在澳大利亚的殖民化时间相吻合。此外，马达加斯加和澳大利亚的新等翅目动物群的分类组成惊人地相似，马达加斯加还拥有澳大利亚没有的另外两个谱系。因此，与澳大利亚类似，新等翅目在草原全球扩张期间殖民马达加斯加，可能是由于这种新生物群落的传播所带来的生态机会。

Madagascar is home to many endemic plant and animal species owing to its ancient isolation from other landmasses. This unique fauna includes several lineages of termites, a group of insects known for their key role in organic matter decomposition in many terrestrial ecosystems. How and when termites colonised Madagascar remains unknown. In this study, we used 601 mitochondrial genomes, 93 of which were generated from Madagascan samples, to infer the global historical biogeography of Neoisoptera, a lineage containing upwards of 80% of described termite species. Our results indicate that Neoisoptera colonised Madagascar between seven to ten times independently during the Miocene, between 8.4-16.6 Ma (95% HPD: 6.1-19.9 Ma). This timing matches that of the colonization of Australia by Neoisoptera. Furthermore, the taxonomic composition of the Neoisopteran fauna of Madagascar and Australia are strikingly similar, with Madagascar harbouring an additional two lineages absent from Australia. Therefore, akin to Australia, Neoisoptera colonised Madagascar during the global expansion of grasslands, possibly helped by the ecological opportunities arising from the spread of this new biome.

Neoisoptera repetitively colonised Madagascar after the Middle Miocene climatic optimum

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