Mitochondrial evidence for the hybrid origin of the kipunji, Rungwecebus kipunji (Primates: Papionini)
Mitochondrial evidence for the hybrid origin of the kipunji, Rungwecebus kipunji (Primates: Papionini)
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DOI：
10.1016/j.ympev.2009.02.004
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发表时间：
2009-05-01
影响因子：
4.1
通讯作者：
Disotell, Todd R.
中科院分区：
文献类型：
--
作者：
Burrell, Andrew S.;Jolly, Clifford J.;Disotell, Todd R.
普通狒狒（Papio）、狮尾狒狒（Theropithecus）和狒狒-白眉猴（Lophocebus）是非洲狒狒的近亲。2005年，在坦桑尼亚的残留山地和亚山地森林中发现了一种名为Lophocebus kipunji的物种，该物种是基于一个单一的标本和对现存动物的观察。它最初被分配到Lophocebus是基于它的整体形态，但随后的遗传研究表明它是普通狒狒（Papio）的姐妹分类群，导致它的属分离，作为Rungwecebus。作为一个类似于白眉猴的姊妹分类群，Rungwecebus可以被解释为一个来自更陆生的狒狒类祖先的树栖衍生物，或者是Lophocebus-Papio-Theropithecus分支中类似于白眉猴的共同祖先的幸存者。在这里，我们提出了一个新的，强有力的支持，线粒体DNA（mtDNA）基因，包括狒狒从地理上接近kipunji的人口。而不是支持姐妹分类单元的地位，新的基因组学不仅将kipunji的mtDNA定位于Papio单倍型中，它明确地将其分配到一个线粒体分支，包括地理上相邻的黄色狒狒（Papio cynocephalus）。这种关系表明，kipunji是从一个黄色狒狒的后裔，并已收敛在一个mangabey样形态，或者，更有可能的是，它起源于杂交Papio cf。cynocephalus雌性和Lophocebus sp.雄性，约为0.65Ma。我们相信这是哺乳动物中第一个自然发生的属间杂交能产生一个新的、独特的、长期存活的分类单元的案例。随着分子证据的积累，可以预期会有更多这样的案例。(C)2009 Elsevier Inc. All rights reserved.
Common baboons (Papio), gelada baboons (Theropithecus) and baboon-mangabeys (Lophocebus) are closely related African papionin monkeys. In 2005, the species Lophocebus kipunji was described from relict montane and submontane forests in Tanzania, based upon a single specimen and observations of living animals. Its initial assignment to Lophocebus was based on its overall morphology, but subsequent genetic studies suggesting that it was sister taxon to common baboons (Papio) led to its generic separation, as Rungwecebus. As a mangabey-like sister-taxon to Papio, Rungwecebus could be interpreted either as an arboreal derivative from a more terrestrial, baboon-like ancestor, or as a survivor of a mangabey-like common ancestor of the Lophocebus-Papio-Theropithecus clade. Here, we present a new, strongly-supported, mitochondrial DNA (mtDNA) phylogeny that includes Papio baboons from populations geographically close to the kipunji. Rather than supporting sister-taxon status, the new phylogeny not only situates the kipunji's mtDNA among Papio haplotypes, it clearly assigns it to a mitochondrial clade including geographically adjacent yellow baboons (Papio cynocephalus). This relationship suggests either that the kipunji is descended from a yellow baboon, and has converged on a mangabey-like morphology, or, much more likely, that it originated by hybridization between Papio cf. cynocephalus females and Lophocebus sp. males, about 0.65 Ma. We believe this to be the first case among mammals in which a natural occurrence of inter-generic hybridization can be shown to have resulted in a new, distinct, long-surviving taxon. More such cases can be anticipated as molecular evidence accumulates. (C) 2009 Elsevier Inc. All rights reserved.