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Figure 4


Fig. 4. Interspecific differences in the measured force exerted on attached prey. To take into account the intraspecific variation in the acceleration at the mouth aperture, we regressed the measured force against acceleration at the mouth and then compared the slopes for the two species. Similar slopes (and intercepts) would indicate that the differences in observed force are due to differences in the acceleration at the mouth alone. However, the slope of the regression was significantly different between species (mixed-effects model, P<0.05), indicating a contribution of other factors to the difference in force. Forces exerted by bluegill (BG) are indicated by blue open circles and blue regression lines, largemouth bass data are indicated by red open circles and red broken regression lines. Grey background represents the observed range of accelerations at the mouth for bass.





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