Integration in guppies. (A) Four points were digitized and were used to calculate gape (the distance between the jaws), swim speed (the change in distance over each frame of the approximate center of mass) and standard length (SL; the distance between the tail and lower jaw in a single frame before mouth opening) across two replicate high- and low-predation populations (Table S1). (B) A visual representation of the raw data (Model 1) and (C) the size-corrected residuals of log-transformed regressions with SL (Model 3). Points represent one video per fish. Regression lines do not represent significant model effects (for these, see Table 2) and are shown only for visual comparison. Fit of each line is shown using the r² statistic (*P<0.05). A repeatable pattern of the relationship only occurring in low-predation populations is supported by all three general linear models (Table 2).