Figure 2
Mean morning effects versus mean afternoon effects estimated from the autoregressive conditional Poisson model. Each small circle gives the morning effect (abscissa) and the afternoon effect (ordinate) estimated for a specific day and colony (computed number of exits every 5 min in the morning and afternoon, respectively). In each panel, small coloured circles (in black, red, green or blue, depending on the panel) correspond to daily morning and afternoon effects of the colony of interest, whereas grey small circles correspond to daily morning and afternoon effects of the three other colonies. In each panel, large circles represent the average effects of the colony of interest for 5-day periods without SHW. Large dots represent the average effects for 5-day periods with SHW. Lines linking the large circles and dots represent jumps from a 5-day period to the following 5-days period. Arrows indicate the first 5-day periods of the experiment without SHW (large circle), which is followed by a 5-day periods with SHW (large dot) and so on. For experimental colonies, large dots (SHW+ periods) were consistently above large circles (SHW− periods), showing an increase in colony activity under SHW in the afternoon.
