Fig. 1.

Displacement of native ants by Argentine ants over an 8-year period in Rice Canyon, San Diego County, California. Sampling stations (1–9) are shown on the x axis. Open squares, number of Argentine ant workers captured per pitfall trap at each sampling station; closed circles, number of native ant species captured in pitfall traps at each sampling station. The photograph (Bottom Right) shows an aerial view of Rice Canyon (coastal sage scrub surrounded by residential development) and the approximate location of the center of each sampling station. Image provided by Google Earth.