Table 1.

Effects of strike kinematics on suction feeding performance in two centrarchid species

SpeciesForceNR2Slope (×10–4 N m s–2)Species effect (P)
BluegillMeasured600.498.63±1.74***
Largemouth bassMeasured330.192.33±0.92**0.04
Gape simulation0.162.63±0.93*0.001
Efficiency simulation0.385.07±1.1***0.01
Mouth displacement simulation0.467.71±3.0*0.3
  • To examine the effect of discrete strike kinematics on the disparity in the measured force between the two species, we simulated largemouth bass strikes parameterized with the observed kinematics (Fig. 6A) with a gape similar to bluegill (gape simulation; Fig. 6B), with high strike efficiency and small gape (efficiency simulation; Fig. 6C), and a model including high strike efficiency, small gape and fast mouth displacement (mouth displacement simulation; Fig. 6D). In each case, first we regressed the simulated force against acceleration at the mouth (to account the observed intraspecific variation; Fig. 4) and then tested whether the slopes of the two species are different (`species effect'). R2 and slope (columns 4,5) are statistics for the regression of force and acceleration at the mouth (mean ± s.e.m.), significance level indicates a difference from slope of zero. `Species effect' indicates whether the slope is different from that of bluegill. *P<0.05, **P<0.01, ***P<0.001