 Although the removal of "P. dominula" population did slow down their expansion, in 2005, 62% of the colonies at the Preserve were "P. dominula".A number of researchers concluded that "P. dominula" was likely replacing "P. fuscatus" through indirect or exploitative competition, which was consistent with their finding that "P. dominula" was significantly more productive than "P. fuscatus".Introduced populations of "P. dominula" contain relatively high levels of genetic diversity and these variations are most likely due to different dispersal events.