Figure 2
From: Radiocarbon analysis reveals expanded diet breadth associates with the invasion of a predatory ant
Diet ages and trophic ecology of B. chinensis in the native range (Japan) and in the introduced range (United States). (a) Diet ages (least square means ± SE) of B. chinensis and termites in the native range (Japan) and in the introduced range (United States). Both the study sites and the sample types had significant effects on diet ages of B. chinensis and termites (F = 14.19, P = 0.0037 and F = 133.61, P < 0.0001, respectively). Interaction effect of native/introduced and sample type was also significant (F = 12.79, P = 0.0008), where the diet age of B. chinensis in the introduced range was significantly younger than that of B. chinensis in the native range, but there was no significant difference in the diet ages of termites. Different letters on the bars indicate significant differences among groups (P < 0.05, Tukey-Kramer test). (b) There was no significant difference between the native range and the introduced range in δ13C (least square means ± SE) (F = 0.0150, P = 0.904) and in δ15N (least square means ± SE) (F = 0.1809, P = 0.678), there was a while highly significant difference among sample types in δ13C (F = 218.47, P < 0.0001) and in δ15N (F = 287.68, P < 0.0001). The interaction term had no significant effect on δ13C (F = 1.81, P = 0.170) or δ15N (F = 1.94, P = 0.149).
