Figure 1.

Interspecific variation of tandem running in Coptotermes termites. (a) During tandem runs, the female leader releases a short-range pheromone that attracts the male follower. The chemical is shared between C. formosanus and C. gestroi, but the quantity is much larger in C. formosanus. (b–d) Comparison of the duration of tandem running until separation across different combinations. Kaplan–Meier survival curves were generated for each pairing combination. Asterisk (*) indicates significant difference (mixed effect Cox model, p < 0.05). + indicates censored data due to the end of observations. Shaded regions show 95% confidence intervals. (Online version in colour.)