Expansion Analysis
The Tajima’s D and Fu’s F values were positive for the Australian and
South African populations suggesting that these populations are not
currently expanding (Table 2). The Fu’s F value was negative for North
America (-1.56808 ± 1.53120) indicating that the North American
population is expanding (Table 2). The mismatch analyses for sudden
(demographic) expansion was rejected for South Africa (SSD=0.081,
p=0.04) but not for Australia (SSD=0.107, p=0.07) nor for North America
(SSD=0.16, p=0.06). The analyses for spatial expansion was not rejected
for any of the three invasions (South Africa: SSD=0.075, p=0.06;
Australia: SSD=0.057; p=0.26; North America: SSD=0.011, p=0.59; Figure
5).