Booton G C, Kaufman L, Chandler M, Oguto-Ohwayo R, Duan W, Fuerst P A
Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, 43210, USA.
Mol Phylogenet Evol. 1999 Mar;11(2):273-82. doi: 10.1006/mpev.1998.0576.
The nucleotide sequences of the first internal transcribed spacer (ITS-1) of the ribosomal RNA gene cluster have been determined for 11 species of closely related endemic cichlid fishes of the Lake Victoria region (LVR) and 6 related East African cichlids. The ITS-1 sequences confirmed independently derived basal phylogenies, but provide limited insight within this species flock. The line leading to Pseudocrenilabrus multicolor arose early, close to the divergence event that separated the tilapiine and haplochromine tribes of the "African Group" of the family Cichlidae. In this phylogeny, Astatoreochromis alluaudi and the riverine Astatotilapia burtoni are sister taxa, which together are a sister group to a monophyletic assemblage including both Lake Victoria and Lake Edward taxa. The ITS-1 data support the monophyly of haplochromine genera across lakes. Since Lake Victoria is believed to have been dry between 14, 500 and 12,400 BPE, the modern assemblage must have been derived from reinvasion by the products of earlier cladogenesis events. Thus, although the regional superflock is monophyletic, the haplochromines of Lake Victoria itself did not evolve in situ from a single ancestor.
已测定了维多利亚湖地区（LVR）11种亲缘关系密切的特有丽鱼科鱼类以及6种东非相关丽鱼科鱼类核糖体RNA基因簇的第一个内部转录间隔区（ITS-1）的核苷酸序列。ITS-1序列证实了独立衍生的基础系统发育，但在这个物种群中提供的见解有限。导致五彩伪丽鱼的谱系出现得较早，接近将丽鱼科“非洲类群”的罗非鱼族和朴丽鱼族分开的分歧事件。在这个系统发育中，阿鲁奥氏丽体鱼和河栖的伯氏非鲫是姐妹分类单元，它们共同构成一个姐妹群，与包括维多利亚湖和爱德华湖分类单元的单系类群相对。ITS-1数据支持跨湖泊朴丽鱼属的单系性。由于据信维多利亚湖在距今14500年至12400年前是干涸的，现代鱼类组合必定是早期物种形成事件的产物再次入侵形成的。因此，尽管该区域的超级物种群是单系的，但维多利亚湖本身的朴丽鱼并非从单一祖先原地进化而来。
