High genetic divergences indicate ancient separation of parthenogenetic lineages of the oribatid mite Platynothrus peltifer (Acari, Oribatida)
High genetic divergences indicate ancient separation of parthenogenetic lineages of the oribatid mite Platynothrus peltifer (Acari, Oribatida)
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DOI：
10.1111/j.1420-9101.2006.01183.x
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发表时间：
2007-01-01
影响因子：
2.1
通讯作者：
Scheu, S.
中科院分区：
文献类型：
--
作者：
Heethoff, M.;Domes, K.;Scheu, S.
古老的单性生殖谱系（例如蛭形轮虫和达尔文介形虫）的存在对性的进化和维持理论提出了挑战。有人提出，甲螨（阿卡里）的几个孤雌生殖和物种分类群也有一个古老的起源。我们使用线粒体基因细胞色素氧化酶I的核苷酸序列估计年龄的孤雌生殖甲螨物种Platynothrus peltifer。对来自北美、欧洲和亚洲16个地点的65份标本进行了分析。七个主要的分支被确定。进化枝内遗传距离低于2%，与大多数生物的种内遗传多样性相似。然而，分支之间的距离平均为56%，最大为125%。我们的结论是，P. peltifer，因为它是目前设想的，已经存在了大约1亿年，有一个现存的分布，从大陆漂移，而不是分散的结果，并受到几个神秘的物种。
Theories on the evolution and maintenance of sex are challenged by the existence of ancient parthenogenetic lineages such as bdelloid rotifers and darwinulid ostracods. It has been proposed that several parthenogenetic and speciose taxa of oribatid mites (Acari) also have an ancient origin. We used nucleotide sequences of the mitochondrial gene cytochrome oxidase I to estimate the age of the parthenogenetic oribatid mite species Platynothrus peltifer. Sixty-five specimens from 16 sites in North America, Europe and Asia were analysed. Seven major clades were identified. Within-clade genetic distances were below 2 % similar to the total intraspecific genetic diversity of most organisms. However, distances between clades averaged 56 % with a maximum of 125 %. We conclude that P. peltifer, as it is currently conceived, has existed for perhaps 100 million years, has an extant distribution that results from continental drift rather than dispersal and was subject to several cryptic speciations.