Figure 3

Effect of playback of ambient reef sound (white bars) or one of two outboard motors types (2- or 4-stroke; light grey and dark grey respectively) on the fast-start kinematics of juvenile whitetail damselfish (Pomacentrus chrysurus). The kinematic variables (mean ± SE) represented are: (a) response latency, and (b) average response speed. Boat noise was played either at the same time as the drop stimulus (acute), or for 5 min prior to the drop stimulus (chronic). Data for latency were square-root transformed for analysis and standardised for distance to stimulus, though back-transformed covariate-standardised data are plotted. Results of planned comparisons are superimposed over the bars, with lines between means representing no significant difference, and asterisks representing significant difference between groups. N (left to right) = 55, 54, 51, 49, 52.