Vicariance followed by secondary gene flow in a young gazelle species complex.
Vicariance followed by secondary gene flow in a young gazelle species complex.
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DOI：
10.1111/mec.15738
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发表时间：
2021-01
影响因子：
4.9
通讯作者：
Heller R
中科院分区：
文献类型：
--
作者：
Garcia-Erill G;Kjaer MM;Albrechtsen A;Siegismund HR;Heller R
格兰特瞪羚最近被认为是一个由三个高度分化的mtDNA谱系组成的物种复合体（Nanger granti，N. notata和N. petersii）。这三个谱系在东非的分布不重叠，但没有任何明显的地理划分，使它们成为详细研究异域物种形成早期进化动力学的有趣模型。在这里，我们使用106只瞪羚个体的限制性位点相关（RAD）测序获得的基因组数据来阐明格兰特瞪羚分歧背后的进化过程，表征其遗传结构，并评估物种复合体中主要谱系之间的基因流的存在。我们将物种分化追溯到134，000年前，这在进化方面是最近的。我们发现在N. granti内的种群细分，这与先前提出的两个亚种，N. g。granti和N. g.罗伯茨。此外，这两个血统似乎在马赛马拉杂交。也许更令人惊讶的是，考虑到它们极端的遗传分化，格兰蒂猪笼草和彼得猪笼草在Mkomazi中也显示出长期混合的迹象，我们认为这是一个杂交种群，最有可能是由异域血统进行二次接触而建立的。尽管这个人口的混合组成，升高的X染色体分化表明，选择可能会塑造这个人口中的杂交结果。因此，我们的研究结果提供了详细的见解异域物种形成和二次接触的过程中，最近辐射的物种复杂。
Grant's gazelles have recently been proposed to be a species complex comprising three highly divergent mtDNA lineages (Nanger granti, N. notata and N. petersii). The three lineages have nonoverlapping distributions in East Africa, but without any obvious geographical divisions, making them an interesting model for studying the early‐stage evolutionary dynamics of allopatric speciation in detail. Here, we use genomic data obtained by restriction site‐associated (RAD) sequencing of 106 gazelle individuals to shed light on the evolutionary processes underlying Grant's gazelle divergence, to characterize their genetic structure and to assess the presence of gene flow between the main lineages in the species complex. We date the species divergence to 134,000 years ago, which is recent in evolutionary terms. We find population subdivision within N. granti, which coincides with the previously suggested two subspecies, N. g. granti and N. g. robertsii. Moreover, these two lineages seem to have hybridized in Masai Mara. Perhaps more surprisingly given their extreme genetic differentiation, N. granti and N. petersii also show signs of prolonged admixture in Mkomazi, which we identified as a hybrid population most likely founded by allopatric lineages coming into secondary contact. Despite the admixed composition of this population, elevated X chromosomal differentiation suggests that selection may be shaping the outcome of hybridization in this population. Our results therefore provide detailed insights into the processes of allopatric speciation and secondary contact in a recently radiated species complex.
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