DROPSA participate in a study on the routes of invasions of D. suzukii
A study of the routes of invasion of D. suzukii worldwide, led by an INRA team in Montpellier and the Natural History Museum of Paris and to which several DROPSA partners contributed, has just been published in Molecular Ecology and Evolution (Fraimout et al. 2017). This study is the first of this magnitude on D. suzukii and it clearly helps in understanding the worldwide introduction pathways of D. suzukii. It used a multi-locus microsatellite dataset (25 loci on 23 worldwide sampling locations) and approximate Bayesian computation. The main results are as follows:
• Japan emerges as the most probable source of the earliest recorded invasion into Hawaii.
• Southeast China and Hawaii together are the most probable sources of populations in western North America, which then in turn served as sources for those in eastern North America.
• European populations are genetically more homogeneous than North American populations, and their most probable source is northeast China, with evidence of a limited gene flow from the eastern US as well.
All introduced populations passed through bottlenecks, and analyses reveal five distinct admixture events. Further samples are presently being collected in Asia to refine the analysis.
Commonwealth Agricultural Bureau International