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首页> 外文期刊>Parasitology >The sympatric occurrence of two genetically divergent lineages of sucking louse, Polyplax arvicanthis (Phthiraptera: Anoplura), on the four-striped mouse genus, Rhabdomys (Rodentia: Muridae)
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The sympatric occurrence of two genetically divergent lineages of sucking louse, Polyplax arvicanthis (Phthiraptera: Anoplura), on the four-striped mouse genus, Rhabdomys (Rodentia: Muridae)

机译：在四个条纹的鼠属Rhabdomys（Rodentia：Muridae）上同时出现两个吸吮虱子的遗传遗传谱系，即Polyplax arvicanthis（Phthiraptera：Anoplura）。

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摘要

Within southern Africa, the widely distributed four-striped mouse genus (Rhabdomys) is parasitized by, amongst others, the specific ectoparasitic sucking louse, Polyplax arvicanthis. Given the presence of significant geographically structured genetic divergence in Rhabdomys, and the propensity of parasites to harbour cryptic diversity, the molecular systematics of P. arvicanthis was investigated. Representatives of P. arvicanthis were sampled from Rhabdomys at 16 localities throughout southern Africa. Parsimony and Bayesian gene trees were constructed for the mitochondrial COI, 12S rRNA, 16S rRNA and nuclear CAD genes. Our findings support the existence of 2 genetic groups within P. arvicanthis separated by at least 25% COI sequence divergence, which is comparable to that observed among recognized Polyplax species. We therefore propose that these 2 genetic lineages probably represent distinct species and that the apparent absence of clear morphological differences may point to cryptic speciation. The 2 taxa have sympatric distributions throughout most of the sampled host range and also occasionally occur sympatrically on the same host individual. The co-occurrence of these genetically distinct lineages probably resulted from parasite duplication via host-associated allopatric divergence and subsequent reciprocal range expansions of the 2 parasite taxa throughout southern Africa.
机译：在南部非洲，分布广泛的四条纹小鼠属（Rhabdomys）除其他外，被特定的寄生寄生性吸吮虱子Polyplax arvicanthis寄生。鉴于横纹肌虫存在明显的地理结构遗传差异，并且寄生虫倾向于隐性遗传，因此对P. arvicanthis的分子系统进行了研究。 P. arvicanthis的代表是从整个非洲南部16个地方的横纹肌中取样的。为线粒体COI，12S rRNA，16S rRNA和核CAD基因构建了简约和贝叶斯基因树。我们的发现支持在P. arvicanthis中存在两个遗传基团，这些遗传基团之间至少存在25％的COI序列差异，这与在公认的Polyplax物种中观察到的相当。因此，我们建议这两个遗传谱系可能代表不同的物种，并且明显的形态学差异的明显缺乏可能表明是隐性物种。 2个分类单元在大多数采样宿主范围内具有同族分布，并且偶尔也同伴出现在同一宿主个体上。这些遗传上不同的谱系的共存可能是由于寄生虫通过宿主相关的异源异源复制而引起的复制，以及随后在整个南部非洲的这两个寄生虫分类群的倒数范围扩展。

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