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首页> 外文期刊>Biological Journal of the Linnean Society >Are there two cryptic species of the lesser jerboa Jaculus jaculus (Rodentia: Dipodidae) in Tunisia? Evidence from molecular, morphometric, and cytogenetic data
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Are there two cryptic species of the lesser jerboa Jaculus jaculus (Rodentia: Dipodidae) in Tunisia? Evidence from molecular, morphometric, and cytogenetic data

机译：突尼斯是否有两个隐秘的小亚种Jaculus jaculus（Rodentia：Dipodidae）？来自分子，形态和细胞遗传学数据的证据

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摘要

Jerboas belonging to the genus Jaculus are widely distributed rodents inhabiting Palearctic desert and semi-desert areas. Previous studies on the lesser Egyptian jerboa Jaculus jaculus showed the existence of various morphological forms of controversial taxonomic status. They were sometimes related to two different species, J. jaculus and Jaculus deserti, although this has not been recognized in recent taxonomic updates. To clarify the systematic status of J. jaculus in Tunisia, we performed molecular (phylogenetic analyses of cytochrome b sequences), morphological (multivariate analyses of 13 skull measurements) and karyotypic (standard preparations from bone marrow cells) analyses on a number of specimens collected from ten localities. Our analyses revealed two monophyletic, well differentiated clades, with a mean genetic divergence value (K2P = 10.9 +/- 0.01%), which is within the range of distances generally observed between rodent species. Morphometric analyses clearly separated populations of the two genetic clades from each other. However, karyotypes of individuals from both clades appeared similar. Individuals from both molecular clades/morphometric groups were found in sympatry in most of the localities sampled. These results, as obtained from a restricted area of the total distribution, suggest that there are two separate species within the currently accepted J. jaculus in Tunisia. Alternative hypotheses such as the occurrence of a strong, ancient phylogeographic structure, or the presence of pseudogenes, are also considered to account for the results obtained.
机译：属于Jaculus属的Jerboas是广泛分布的啮齿动物，栖息在古北沙漠和半沙漠地区。先前对较小的埃及小er Jaculus jaculus的研究表明，存在有争议的生物分类地位的各种形态形式。它们有时与两种不同的物种有关，即Ja。jaculus和Jaculus deserti，尽管在最近的分类学更新中尚未认识到这一点。为了阐明突尼斯J. jaculus的系统状态，我们对收集的许多标本进行了分子（​​细胞色素b序列的系统发育分析），形态学（13种颅骨测量结果的多元分析）和核型（来自骨髓细胞的标准制剂）分析来自十个地方。我们的分析揭示了两个单系的，分化良好的进化枝，其平均遗传差异值（K2P = 10.9 +/- 0.01％）处于啮齿动物物种之间通常观察到的距离范围内。形态分析清楚地将两个遗传进化枝的种群彼此分离。但是，来自两个进化枝的个体的核型似乎相似。在大多数采样地点的共生体中都发现了来自两个分子进化枝/形态学组的个体。从总分布的有限区域中获得的这些结果表明，在突尼斯目前被接受的J. jaculus中有两个单独的物种。还可以考虑使用其他假设，例如，一个坚固的古老系统地理结构的出现或假基因的存在，来解释所获得的结果。

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