Fig. 5.

Comparison of the precolonization time (delay before the first insect was observed) between the boxes. The most accessible box (box G for the first set of experiments and box F for the experiments without G) was used as the reference; for each replication, the delay before insect arrival was calculated as the time of the first catch in a box minus the time of the first catch in the reference box (G or F). Bars correspond to trials. Black bars indicate the delay in colonization, and the gray bars represent any colonization, i.e., a delay in fly arrival extending over 56 h (the duration of one run). No bar indicates no difference, i.e., colonization at the same time as the reference box.