title: Drosophila suzukii: the genetic footprint of a recent, worldwide invasion.
abstract: Native to Asia, the soft-skinned fruit pest Drosophila suzukii has recently invaded the United States and Europe. The eastern United States represents the most recent expansion of their range, and presents an opportunity to test alternative models of colonization history. Here, we investigate the genetic population structure of this invasive fruit fly, with a focus on the eastern United States. We sequenced six X-linked gene fragments from 246 individuals collected from a total of 12 populations. We examine patterns of genetic diversity within and between populations and explore alternative colonization scenarios using approximate Bayesian computation. Our results indicate high levels of nucleotide diversity in this species and suggest that the recent invasions of Europe and the continental United States are independent demographic events. More broadly speaking, our results highlight the importance of integrating population structure into demographic models, particularly when attempting to reconstruct invasion histories. Finally, our simulation results illustrate the general challenge in reconstructing invasion histories using genetic data and suggest that genome-level data are often required to distinguish among alternative demographic scenarios.
authors.affiliation: Department of Biology, Indiana University, Bloomington.
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Adrion
authors.affiliation: Department of Biology, University of Fribourg, Fribourg, Switzerland Swiss Institute of Bioinformatics, Lausanne, Switzerland.
authors.forename: Athanasios
authors.initials: A
authors.lastname: Kousathanas
authors.affiliation: Department of Genetics and IRBio, University of Barcelona, Barcelona, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Pascual
authors.affiliation: Department of Entomology, North Carolina State University.
authors.forename: Hannah J
authors.initials: HJ
authors.lastname: Burrack
authors.affiliation: Department of Biological Sciences, North Carolina State University.
authors.forename: Nick M
authors.initials: NM
authors.lastname: Haddad
authors.affiliation: Department of Biology, Stanford University.
authors.forename: Alan O
authors.initials: AO
authors.lastname: Bergland
authors.affiliation: Department of Biology, Stanford University.
authors.forename: Heather
authors.initials: H
authors.lastname: Machado
authors.affiliation: Department of Organismic and Evolutionary Biology, Harvard University.
authors.forename: Timothy B
authors.initials: TB
authors.lastname: Sackton
authors.affiliation: Department of Biology, Reed College, Portland, OR.
authors.forename: Todd A
authors.initials: TA
authors.lastname: Schlenke
authors.affiliation: Department of Biology, Indiana University, Bloomington.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Watada
authors.affiliation: Department of Biology, University of Fribourg, Fribourg, Switzerland Swiss Institute of Bioinformatics, Lausanne, Switzerland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Wegmann
authors.affiliation: Department of Biological Sciences, North Carolina State University ndsingh@ncsu.edu.
authors.forename: Nadia D
authors.initials: ND
authors.lastname: Singh
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D004330:Drosophila / Q000235:genetics*; D017344:Genes, Insect; D014644:Genetic Variation; D006239:Haplotypes; D058865:Introduced Species; D008297:Male; D018895:Microsatellite Repeats; D008957:Models, Genetic; D013030:Spain; D014481:United States
keywords: Drosophila suzukii; invasion; pest; population genetics