Fig. 5.

Effects of an arginine–saline meal over time on the pattern of locomotory behaviors used to traverse a behavioral arena at different water depths. We tested 11 leeches [fed to satiation with a solution of arginine (1 mmol l⁻¹) and NaCl (150 mmol l⁻¹) on day 0] in four different depths – 0.5x, 1x, 2x and 4x. Percentage of (A) crawling steps and (B) swimming episodes before and after feeding while immersed at the four water depths. Error bars represent s.e.m. Filled data points differed significantly (P<0.05) from the pre-feeding data points.