title: Evidence for multiple introductions of an invasive wild bee species currently under rapid range expansion in Europe
abstract: We hypothesize that the observed cluster formation resulted from multiple, independent introductions of the species to the European continent. This study draws a first picture of an early invasion stage of this wild bee and forms a foundation for further investigations, including studies of the species in their native Asian range and in the invaded range in North America.
journal: BMC Ecology and Evolution