Author:
Lombaert Eric,Ciosi Marc,Miller Nicholas J.,Sappington Thomas W.,Blin Aurélie,Guillemaud Thomas
Abstract
AbstractFirst described from western Kansas, USA, the western corn rootworm, Diabrotica virgifera virgifera, is one of the worst pests of maize. The species is generally thought to be of Mexican origin and to have incidentally followed the expansion of maize cultivation into North America thousands of years ago. However, this hypothesis has never been investigated formally. In this study, the genetic variability of samples collected throughout North America was analysed at 13 microsatellite marker loci to explore precisely the population genetic structure and colonization history of D. v. virgifera. In particular, we used up-to-date Approximate Bayesian Computation methods based on random forest algorithms to test a Mexican versus a central-USA origin of the species, and to compare various possible timings of colonization. This analysis provided strong evidence that the origin of D. v. virgifera was southern (Mexico, or even further south). Surprisingly, we also found that the expansion of the species north of its origin was recent - probably not before 1100 years ago - thus indicating it was not directly associated with the early history of maize expansion out of Mexico, a far more ancient event.
Publisher
Cold Spring Harbor Laboratory
Reference79 articles.
1. The history of the common maize varieties of the United States Corn Belt;Agric Hist,1952
2. Approximate Bayesian computation in population genetics;Genetics,2002
3. Using ABC and microsatellite data to detect multiple introductions of invasive species from a single source
4. Controlling the false discovery rate - a practical and powerful approach to multiple testing;J R Stat Soc Ser B-Methodological,1995
5. Estimation of the dispersal of a major pest of maize by cline analysis of a temporary contact zone between two invasive outbreaks