Secondary contact and admixture between independently invading populations of the Western corn rootworm, diabrotica virgifera virgifera in Europe

Bermond, G., Ciosi, M. , Lombaert, E., Blin, A., Boriani, M., Furlan, L., Toepfer, S. and Guillemaud, T. (2012) Secondary contact and admixture between independently invading populations of the Western corn rootworm, diabrotica virgifera virgifera in Europe. PLoS ONE, 7(11), e50129. (doi: 10.1371/journal.pone.0050129)

[img]
Preview
Text
75052.pdf - Published Version
Available under License Creative Commons Attribution.

515kB

Abstract

The western corn rootworm, Diabrotica virgifera virgifera (Coleoptera: Chrysomelidae), is one of the most destructive pests of corn in North America and is currently invading Europe. The two major invasive outbreaks of rootworm in Europe have occurred, in North-West Italy and in Central and South-Eastern Europe. These two outbreaks originated from independent introductions from North America. Secondary contact probably occurred in North Italy between these two outbreaks, in 2008. We used 13 microsatellite markers to conduct a population genetics study, to demonstrate that this geographic contact resulted in a zone of admixture in the Italian region of Veneto. We show that i) genetic variation is greater in the contact zone than in the parental outbreaks; ii) several signs of admixture were detected in some Venetian samples, in a Bayesian analysis of the population structure and in an approximate Bayesian computation analysis of historical scenarios and, finally, iii) allelic frequency clines were observed at microsatellite loci. The contact between the invasive outbreaks in North-West Italy and Central and South-Eastern Europe resulted in a zone of admixture, with particular characteristics. The evolutionary implications of the existence of a zone of admixture in Northern Italy and their possible impact on the invasion success of the western corn rootworm are discussed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ciosi, Dr Marc
Authors: Bermond, G., Ciosi, M., Lombaert, E., Blin, A., Boriani, M., Furlan, L., Toepfer, S., and Guillemaud, T.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:PLoS ONE
Publisher:Public Library of Science
ISSN:1932-6203
Published Online:26 November 2012
Copyright Holders:Copyright © 2012 The Authors
First Published:First published in PloS ONE 7(11):e50129
Publisher Policy:Reproduced under a Creative Commons License

University Staff: Request a correction | Enlighten Editors: Update this record