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Table 3.

Factor loadings from principal components analysis of kinematic variables for all 75 strikes

VariablePC1 (scale feeding)PC2 (suction feeding)
Displacement (deg.)   
    Gape angle 0.30 0.31 
    Hyoid depression 0.25 0.33 
    Cranial elevation 0.14 0.47 
    Opercular expansion 0.004 0.53 
    Jaw rotation 0.29 0.32 
    Prey distance (cm) 0.28 0.04 
Timing (ms)   
    Time to gape angle 0.34 -0.16 
    Time to hyoid depression 0.34 -0.20 
    Time to cranial elevation 0.34 -0.19 
    Time to opercular expansion 0.33 -0.20 
    Time to jaw rotation 0.34 -0.17 
    Total gape cycle time 0.31 -0.14 
Variance measures   
    Eigenvalue 7.66 2.54 
    Percent 63.84 21.13 
    Cumulative percent 63.84 84.97 
VariablePC1 (scale feeding)PC2 (suction feeding)
Displacement (deg.)   
    Gape angle 0.30 0.31 
    Hyoid depression 0.25 0.33 
    Cranial elevation 0.14 0.47 
    Opercular expansion 0.004 0.53 
    Jaw rotation 0.29 0.32 
    Prey distance (cm) 0.28 0.04 
Timing (ms)   
    Time to gape angle 0.34 -0.16 
    Time to hyoid depression 0.34 -0.20 
    Time to cranial elevation 0.34 -0.19 
    Time to opercular expansion 0.33 -0.20 
    Time to jaw rotation 0.34 -0.17 
    Total gape cycle time 0.31 -0.14 
Variance measures   
    Eigenvalue 7.66 2.54 
    Percent 63.84 21.13 
    Cumulative percent 63.84 84.97 
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