Did terrestrial diversification of amoebas (amoebozoa) occur in synchrony with land plants?
Did terrestrial diversification of amoebas (amoebozoa) occur in synchrony with land plants?
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DOI：
10.1371/journal.pone.0074374
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Baldauf S
中科院分区：
文献类型：
--
作者：
Fiz-Palacios O;Romeralo M;Ahmadzadeh A;Weststrand S;Ahlberg PE;Baldauf S
谱系多样化随时间的演变是一个活跃的研究领域，在过去十年中取得了很大进展。与动植物的情况相反，我们对大多数主要原生生物群体的多样化率是如何进化的知之甚少。这主要是由于系统发育关系的不确定性、原生生物化石记录的稀缺以及这些谱系内未知的多样性。我们利用分子测年和物种数量估计，分析了变形虫超类群过去 10 亿年的进化史。在起源于海洋环境之后，我们已经确定了变形虫亚门的三个不同谱系：网盘纲、粘胃纲和弓形纲向陆地生境的殖民。网盘菌属和粘胃菌这两个姐妹类群的共同祖先似乎在植物殖民陆地之前就已经存在了。相比之下，Arcellinida 似乎与陆地植物辐射同步多样化，更具体地说是与苔藓同步。检测到粘胃动物和弓形动物多样化速率的加速表明陆地栖息地内存在共同进化，陆地植物和变形虫可能在这些新生态系统的进化过程中相互作用。
Evolution of lineage diversification through time is an active area of research where much progress has been made in the last decade. Contrary to the situation in animals and plants little is known about how diversification rates have evolved in most major groups of protist. This is mainly due to uncertainty about phylogenetic relationships, scarcity of the protist fossil record and the unknown diversity within these lineages. We have analyzed the evolutionary history of the supergroup Amoebozoa over the last 1000 million years using molecular dating and species number estimates. After an origin in the marine environment we have dated the colonization of terrestrial habitats by three distinct lineages of Amoebozoa: Dictyostelia, Myxogastria and Arcellinida. The common ancestor of the two sister taxa, Dictyostelia and Myxogastria, appears to have existed before the colonization of land by plants. In contrast Arcellinida seems to have diversify in synchrony with land plant radiation, and more specifically with that of mosses. Detection of acceleration of diversification rates in Myxogastria and Arcellinida points to a co-evolution within the terrestrial habitats, where land plants and the amoebozoans may have interacted during the evolution of these new ecosystems.
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