Melo Bruno F, Dorini Beatriz F, Foresti Fausto, Oliveira Claudio
Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, Brazil.
Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, United States.
Front Genet. 2018 Apr 4;9:107. doi: 10.3389/fgene.2018.00107. eCollection 2018.
Evidence that migration prevents population structure among Neotropical characiform fishes has been reported recently but the effects upon species diversification remain unclear. Migratory species of have complex species boundaries and intrincate taxonomy representing a good model to address such questions. Here, we analyzed 147 specimens through barcode sequences covering all species of across a broad geographic area of South America. Species delimitation and population genetic methods revealed very little genetic divergence among mitochondrial lineages suggesting that extensive gene flow resulted likely from the highly migratory behavior, natural hybridization or recent radiation prevent accumulation of genetic disparity among lineages. Our results clearly delimit eight genetic lineages in which four of them contain a single species and four contain more than one morphologically problematic taxon including a trans-Andean species pair and species of the group. Information about biogeographic distribution of haplotypes presented here might contribute to further research on the population genetics and taxonomy of .
最近有报道称，洄游可防止新热带脂鲤科鱼类出现种群结构，但对物种多样化的影响仍不清楚。洄游物种具有复杂的物种边界和错综复杂的分类，是解决此类问题的良好模型。在这里，我们通过条形码序列分析了147个标本，这些序列覆盖了南美洲广大地理区域内的所有 物种。物种界定和种群遗传方法显示，线粒体谱系之间的遗传差异非常小，这表明广泛的基因流动可能是由高度洄游行为、自然杂交或近期辐射导致的，从而阻止了谱系间遗传差异的积累。我们的结果清楚地界定了八个遗传谱系，其中四个包含单一物种，四个包含不止一个形态学上有问题的分类单元，包括一个跨安第斯物种对和 组的物种。这里呈现的单倍型生物地理分布信息可能有助于对 的种群遗传学和分类学进行进一步研究。
