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在Epinephelidae群 (Perciformes) 中的型变化和多样化时间. 对生殖隔离的影响

Karlla Danielle J Amorim¹, Gideão W W F Costa¹, Clóvis C Motta-Neto¹

¹Universidade Federal do Rio Grande do Norte, Centro de Biociências, Departamento de Biologia Celular e Genética, Av. Senador Salgado Filho, s/n, Campus Universitário, Lagoa Nova, 59078-970 Natal, RN, Brazil.

Anais da Academia Brasileira de Ciencias

|April 10, 2024

概括

对三种鱼物种的细胞遗传学分析显示,型差异较低,这表明,尽管差异时间不同,但生殖隔离 (RI) 的获得速度缓慢. 这种同质性支持它们适合养鱼和杂交.

科学领域:

鱼类学鱼类学鱼类学
细胞遗传学细胞遗传学
水产养殖水产养殖的方法

背景情况:

群体 (Epinephelidae和Serranidae) 对水产养殖至关重要,具有杂交潜力.
了解生殖隔离 (RI) 机制对于成功养殖鱼类至关重要.

研究的目的:

为了研究三种鱼物种的型多样化:E.striatus,E.coioides和E.tauvina.
为了将型差异与收购后异位生殖隔离 (RI) 相关联.

主要方法:

标准染色体分析和六种重复性DNA类的现场杂交.
型特征包括染色体数 (2n),基本数 (FN),异染色体分布和rDNA位点.

主要成果:

这三个物种都有2n=48个染色体.
E. coioides 和 E. striatus 呈现出非中心的核型 (FN=48),而 E. tauvina 则具有亚中心的染色体 (FN=56).
重复的DNA元素显示保存的分布模式,rDNA位点是独一无二的,但有时是局部化的.

结论:

研究的鱼物种表现出显著的型同质性,表明染色体多样化的进化速度缓慢.
低型分歧与低水平的后异位RI相关,与Epinephelidae家族的整体同质性相一致.
这些发现支持了水产养殖中鱼物种成功杂交的潜力.

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