autocorrelation

To quantify larval swimming, still images were extracted every 2.5 s for the entire 60-min video recording, and larval positions (x, z co-ordinates) were measured using ImageJ. To obtain w and s for each replicate, all individuals in focus from 20 pairs of frames (frames in a pair were 2.5 s apart) were used, each pair being separated by 3-min intervals.To analyze the temporal covariance of vertical swimming velocities, the position of 20 randomly selected larvae (1 every 3 min) was recorded over time (t) for as long as possible (i.e. until it crossed paths with another larva, or moved out of frame or out of focus). The covariance of each larva's vertical swimming velocity was calculated for time lags from 0 to 60 s. Data set includes larval rearing temperature (°C), experimental temperature (°C), replicate number, larvae number, x (horizontal) and z (vertical) positions within the frame (mm), time since introduction of larvae (min:s:ms or decimal s), and vertical swimming velocities (mm s-1)