title: ABC inference of multi-population divergence with admixture from unphased population genomic data.
abstract: Rapidly developing sequencing technologies and declining costs have made it possible to collect genome-scale data from population-level samples in nonmodel systems. Inferential tools for historical demography given these data sets are, at present, underdeveloped. In particular, approximate Bayesian computation (ABC) has yet to be widely embraced by researchers generating these data. Here, we demonstrate the promise of ABC for analysis of the large data sets that are now attainable from nonmodel taxa through current genomic sequencing technologies. We develop and test an ABC framework for model selection and parameter estimation, given histories of three-population divergence with admixture. We then explore different sampling regimes to illustrate how sampling more loci, longer loci or more individuals affects the quality of model selection and parameter estimation in this ABC framework. Our results show that inferences improved substantially with increases in the number and/or length of sequenced loci, while less benefit was gained by sampling large numbers of individuals. Optimal sampling strategies given our inferential models included at least 2000 loci, each approximately 2 kb in length, sampled from five diploid individuals per population, although specific strategies are model and question dependent. We tested our ABC approach through simulation-based cross-validations and illustrate its application using previously analysed data from the oak gall wasp, Biorhiza pallida.
authors.affiliation: Department of Biology, City College of New York, 160 Convent Ave., MR 526, New York, NY, 10031, USA.
authors.forename: John D
authors.initials: JD
authors.lastname: Robinson
authors.forename: Lynsey
authors.initials: L
authors.lastname: Bunnefeld
authors.forename: Jack
authors.initials: J
authors.lastname: Hearn
authors.forename: Graham N
authors.initials: GN
authors.lastname: Stone
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Hickerson
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D005828:Genetics, Population / Q000379:methods*; D008957:Models, Genetic; D014863:Wasps / Q000235:genetics
keywords: Biorhiza pallida; approximate Bayesian computation; gene flow; next-generation sequencing; phylogeography; speciation
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