Figure 2
From: Desert ants do not acquire and use a three-dimensional global vector
Experiment 1: Proportion of descents and descent distances after flat, ramp, and Λ training. (A) The criterion defining a descent was for ants to walk more than 20 cm without turning around on one of the offered ramps. The frequencies of ants that chose to descend differed between the three training paradigms (p < 0.001, χ2 homogeneity test). The pair-wise comparison was carried out with Fisher's exact test and a Bonferroni correction for multiple comparisons. (B) Frequency histograms of distances that ants walked on descending ramps before turning around for the first time after flat training, ramp training, and Λ training. Ants that made a full descent without ever turning around are plotted in the bottom bar. Results after ramp and Λ training did not differ among each other, but differed strongly from those after flat training (p < 0.001, Kruskal-Wallis H-test; Games-Howell post-hoc test for pair-wise comparisons).