Bayesian inferences suggest that Amazon Yunga Natives diverged from Andeans less than 5000 ybp: implications for South American prehistory

BMC Evolutionary Biology

Research Article

Lilia Cabrera¹  Robert H Gilman²  Wagner CS Magalhães³  Marilia O Scliar³  Giordano B Soares-Souza³  Thiago P Leal³  Latife Pereira³  Maira R Rodrigues³  Eduardo Tarazona-Santos³  Mateus H Gouveia³  Nelson JR Fagundes⁴  Douglas E Berg⁵  Andrea Benazzo⁶  Silvia Ghirotto⁶  Giorgio Bertorelle⁶ 

[1] 4Asociación Benéfica PRISMA, Lima, Peru;4Asociación Benéfica PRISMA, Lima, Peru;Bloomberg School of Public Health, Johns Hopkins University, Baltimore, USA;Universidad Peruana Cayetano Heredia, Lima, Peru;Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil;Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, USA;Department of Medicine, University of California San Diego, San Diego, USA;Dipartimento di Scienze della Vita e Biotecnologie, Università di Ferrara, Ferrara, Italy;

关键词: Population genetics inferences;    Human evolution;    Native American;   

DOI  :  10.1186/s12862-014-0174-3

 received in 2014-04-08, accepted in 2014-07-24,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundArchaeology reports millenary cultural contacts between Peruvian Coast-Andes and the Amazon Yunga, a rainforest transitional region between Andes and Lower Amazonia. To clarify the relationships between cultural and biological evolution of these populations, in particular between Amazon Yungas and Andeans, we used DNA-sequence data, a model-based Bayesian approach and several statistical validations to infer a set of demographic parameters.ResultsWe found that the genetic diversity of the Shimaa (an Amazon Yunga population) is a subset of that of Quechuas from Central-Andes. Using the Isolation-with-Migration population genetics model, we inferred that the Shimaa ancestors were a small subgroup that split less than 5300 years ago (after the development of complex societies) from an ancestral Andean population. After the split, the most plausible scenario compatible with our results is that the ancestors of Shimaas moved toward the Peruvian Amazon Yunga and incorporated the culture and language of some of their neighbors, but not a substantial amount of their genes. We validated our results using Approximate Bayesian Computations, posterior predictive tests and the analysis of pseudo-observed datasets.ConclusionsWe presented a case study in which model-based Bayesian approaches, combined with necessary statistical validations, shed light into the prehistoric demographic relationship between Andeans and a population from the Amazon Yunga. Our results offer a testable model for the peopling of this large transitional environmental region between the Andes and the Lower Amazonia. However, studies on larger samples and involving more populations of these regions are necessary to confirm if the predominant Andean biological origin of the Shimaas is the rule, and not the exception.

【 授权许可】

Unknown   
© Scliar et al.; licensee BioMed Central Ltd. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.