| Summary: | The spread of the dwarf honeybee, <i>Apis florea</i>, in Sudan along the river Nile in a linear fashion provides a good model for studying the population dynamics and genetic effects of an invasion by a honeybee species. We use microsatellite DNA analyses to assess the population structure of both invasive <i>A. florea</i> and native <i>Apis mellifera</i> along the river Nile. The invasive <i>A. florea</i> had significantly higher population densities than the wild, native <i>A. mellifera</i>. Nevertheless, we found no indication of competitive displacement, suggesting that although <i>A. florea</i> had a high invasive potential, it coexisted with the native <i>A. mellifera</i> along the river Nile. The genetic data indicated that the invasion of <i>A. florea</i> was established by a single colony.
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