Table 3.

Summary of a principal component analysis on 19 muscle-activity pattern variables comparing raking feeding behaviours in O. mykiss and S. jardinii

Principal component loadings
Variance explainedPC1 51.4%PC2 18.5%PC3 18%PC4 6.1%
MAP variables
   Protractor hyoiedeus activity duration –34.72 15.18 6.003.12
   Sternohyoideus onset timing 27.22 6.72 17.26 5.90
   Sternohyoideus activity duration –23.14 2.69–13.06–11.48
   Protractor hyoideus onset timing 21.35 –17.30 –17.81 0.96
   Hypaxialis onset timing 19.25 10.697.32–11.41
   Hypaxialis activity duration –18.98 –5.84–3.6211.44
   Adductor mandibularis activity duration–14.33 –18.62 15.49 –3.24
   Adductor mandibularis onset timing10.56 18.02 –16.32 4.87
   Protractor hyoideus integrated area–1.811.08–0.55–0.44
   Sternohyoideus integrated area–0.86–0.770.510.34
   Epaxialis integrated area–0.680.05–0.450.46
   Adductor mandibularis integrated area–0.66–1.681.190.36
   Epaxialis activity duration0.465.241.110.52
   Hypaxialis integrated area0.450.050.62–0.02
   Hypaxialis relative mean amplitude0.040.010.02–0.01
   Protractor hyoideus mean amplitude0.02–0.00–0.01–0.01
   Epaxialis mean amplitude–0.02–0.01–0.010.01
   Adductor mandibularis mean amplitude0.01–0.00–0.000.01
   Sternohyoideus mean amplitude0.00–
F-statistics (F1,40)71.0,7 P<0.0018.20, P<0.0122.54, P<0.0011.10, P=0.3
  • Nested MANOVA results for each PC axis, excluding the effect of individual variability, are also given

    MAP, muscle-activity pattern; bold type signifies high PC loadings (see text) and significant P-values