Szynwelski Bruna E, Mares-Guia Maria A M M, Filippis Ana M B, Gonçalves Gislene L, Tokuda Marcos, Wagner Paulo G C, Wu Stacy, Oliveira Vanilce P, Lima Marcela G M, Lynch Jessica W, Freitas Thales R O
Laboratório de Citogenética e Evolução, Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Fiocruz (Fundação Oswaldo Cruz), Laboratório de Flavivírus, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, Brazil.
Am J Primatol. 2024 Jan;86(1):e23566. doi: 10.1002/ajp.23566. Epub 2023 Oct 19.
Recent molecular studies have clarified the overarching taxonomy of capuchin monkeys, but intraspecific genetic diversity remains unexplored for most capuchin species. One example is Sapajus nigritus, the southernmost capuchin monkey, found in Brazil and Argentina; its phenotypic diversity has been recognized as two geographic subspecies, but the intraspecific genetic structure of this taxon is poorly known. Here, we sampled across most of this species' geographic distribution, producing a newly sequenced data set for genetic analyses that included 78 individuals from 14 populations. We investigated the intraspecific diversity, genetic structure, and evolutionary history using three mitochondrial markers. Our results indicated that S. nigritus populations exhibited high levels of genetic structure. We found strong support for two monophyletic clades within this species with a deep phylogenetic split, and clear separation from other related taxa. Vicariance events seem to have played a prevalent role in shaping S. nigritus genetic differentiation. The Paraíba do Sul River may have driven the deep divergence between southern and northern clades, whereas the Tietê River may have had a weaker, more recent effect on the divergence of populations within the southern clade.
最近的分子研究已经阐明了卷尾猴的总体分类，但大多数卷尾猴物种的种内遗传多样性仍未得到探索。一个例子是黑卷尾猴（Sapajus nigritus），这是最南端的卷尾猴，分布于巴西和阿根廷；其表型多样性被认为是两个地理亚种，但该分类单元的种内遗传结构却鲜为人知。在这里，我们在该物种的大部分地理分布范围内进行了采样，生成了一个新测序的数据集用于遗传分析，其中包括来自14个种群的78个个体。我们使用三个线粒体标记研究了种内多样性、遗传结构和进化历史。我们的结果表明，黑卷尾猴种群表现出高度的遗传结构。我们发现该物种内有两个单系分支得到了有力支持，它们在系统发育上有很深的分歧，并且与其他相关分类群明显分离。地理隔离事件似乎在塑造黑卷尾猴的遗传分化中起了主要作用。南帕拉伊巴河可能导致了南北分支之间的深度分化，而蒂埃特河可能对南部分支内种群的分化产生了较弱、较新的影响。
