Exceptional cryptic diversity and multiple origins of parthenogenesis in a freshwater ostracod
Exceptional cryptic diversity and multiple origins of parthenogenesis in a freshwater ostracod
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DOI：
10.1016/j.ympev.2009.08.022
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发表时间：
2010-02-01
影响因子：
4.1
通讯作者：
Martens, K.
中科院分区：
文献类型：
--
作者：
Bode, S. N. S.;Adolfsson, S.;Martens, K.
在许多分类群中，无性繁殖的持续性取决于新无性谱系的起源和旧谱系的灭绝之间的平衡。这种更替决定了现存无性种群的多样性，从而影响了有性生殖和无性生殖模式之间的相互作用。混合繁殖的物种，如淡水介形类（甲壳纲）形态种Eucypris virens，是研究这些动态的一个很好的模型。该物种也是地理单性生殖，其中有性生殖的雌性和雄性与无性生殖的雌性仅在环地中海地区共存，而无性生殖的雌性则遍布欧洲。对E.基于线粒体COI和16S片段的病毒。它的特点是许多不同的单倍型集群，这些单倍型要么是纯有性的，要么是无性的，只有一个例外，并且经常被深枝分开。对该物种的遗传分析揭示了一个惊人的隐藏多样性，这表明存在一个由40多个隐藏分类群组成的物种复合体。因此，我们建议修订E.绿色的有性生殖表明从不同的有性祖先种群到无性生殖的多次转变。虽然许多过渡似乎是古老的，我们认为，这可能是一个人工制品的存在未采样或灭绝的性谱系。(C)2009 Elsevier Inc. All rights reserved.
The persistence of asexual reproduction in many taxa depends on a balance between the origin of new asexual lineages and the extinction of old ones. This turnover determines the diversity of extant asexual populations and so influences the interaction between sexual and asexual modes of reproduction. Species with mixed reproduction, like the freshwater ostracod (Crustacea) morphospecies Eucypris virens, are a good model to examine these dynamics. This species is also a geographic parthenogen, in which sexual females and males co-exist with asexual females in the circum-Mediterranean area only, whereas asexual females occur all over Europe. A molecular phylogeny of E. virens based on the mitochondrial COI and 16S fragments is presented. It is characterised by many distinct clusters of haplotypes which are either exclusively sexual or asexual, with only one exception, and are often separated by deep branches. Analysis of the phylogeny reveals an astonishing cryptic diversity, which indicates the existence of a species complex with more than 40 cryptic taxa. We therefore suggest a revision of the single species status of E. virens. The phylogeny indicates multiple transitions from diverse sexual ancestor populations to asexuality. Although many transitions appear to be ancient, we argue that this may be an artefact of the existence of unsampled or extinct sexual lineages. (C) 2009 Elsevier Inc. All rights reserved.