Cardoso Adauto L, Pieczarka Julio C, Crampton William G R, Ready Jonathan S, de Figueiredo Ready Wilsea M B, Waddell Joseph C, de Oliveira Jonas A, Nagamachi Cleusa Y
Laboratório de Citogenética, Centro de Estudos Avançados da Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil.
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brasília, Brazil.
Front Genet. 2018 Mar 19;9:81. doi: 10.3389/fgene.2018.00081. eCollection 2018.
Chromosome changes can perform an important role in speciation by acting as post-zygotic reproductive barriers. The Neotropical electric fish genus (Gymnotiformes, Hypopomidae) has 28 described species, but cytogenetic data are hitherto available only for four of them. To understand karyotype evolution and investigate the possible role of chromosome changes in the diversification of this genus, we describe here the karyotype of eight species of from a sympatric assemblage in the central Amazon basin. We analyzed cytogenetic data in the context of a phylogenetic reconstruction of the genus and known patterns of geographical distribution. We found a strong phylogenetic signal for chromosome number and noted that sympatric species have exclusive karyotypes. Additional insights into the role of chromosome changes in the diversification of are discussed.
染色体变化可通过作为合子后生殖障碍在物种形成中发挥重要作用。新热带电鱼属（裸背电鳗目，低臀电鳗科）已描述的物种有28种，但迄今为止细胞遗传学数据仅适用于其中4种。为了解核型进化并研究染色体变化在该属多样化过程中可能发挥的作用，我们在此描述了来自亚马逊河中部流域一个同域种群的8种低臀电鳗的核型。我们在该属的系统发育重建和已知地理分布模式的背景下分析了细胞遗传学数据。我们发现染色体数目存在强烈的系统发育信号，并注意到同域物种具有独特的核型。文中还讨论了对染色体变化在低臀电鳗多样化过程中作用的更多见解。
