Figure 2.
Differences in step length between the open and forest environments. Panels (a) and (b) plot the relationships between absolute step length (Lstep) and leg length (Lleg) in the Batek and Tsimane, respectively. Data points represent individual means. Linear regressions for each environment are plotted with 95% confidence intervals. For both populations, the slope of the relationship between Lstep and Lleg was significantly higher in the open (orange lines, circles) than in the forest (green lines, triangles). Paired t-tests indicated significantly shorter Lstep in the forest than in the open in both populations (see main text). Note that, in contrast to the other plots in the manuscript, the y-axis ranges are not the same in panels (a) and (b). (Online version in colour.)