Main parameters contributing to the first three principal components of the food type analysis
| . | Principal component . | . | . | ||
|---|---|---|---|---|---|
| Parameter . | PC1 (33%) . | PC2 (25%) . | PC3 (8%) . | ||
| PC1 | |||||
| Gape period | 0.970 | 0.168 | 0.017 | ||
| Head elevation period | 0.970 | 0.135 | 0.012 | ||
| Head elevation moment | 0.968 | 0.166 | 0.002 | ||
| Food period | 0.968 | -0.062 | 0.019 | ||
| Food 2 moment | 0.965 | 0.136 | 0.027 | ||
| Gape 2 moment | 0.963 | 0.219 | 0.025 | ||
| Lower bill 2 moment | 0.963 | 0.209 | 0.059 | ||
| Lower bill period | 0.959 | 0.164 | -0.023 | ||
| Difference head elevation | 0.741 | -0.617 | -0.145 | ||
| Gape 1 | 0.734 | -0.462 | -0.088 | ||
| PC2 | |||||
| Gape 2 | -0.052 | 0.914 | 0.051 | ||
| Neck neck moment | 0.361 | 0.885 | 0.072 | ||
| Neck neck period | 0.364 | 0.877 | 0.085 | ||
| Throat moment | 0.421 | 0.860 | 0.168 | ||
| Gape level | 0.200 | 0.829 | -0.073 | ||
| Lower bill at Gape 2 | -0.482 | 0.804 | 0.203 | ||
| Head X moment | 0.514 | 0.748 | 0.017 | ||
| Lower bill level | -0.142 | 0.721 | 0.410 | ||
| PC3 | |||||
| Prokinesis at Gape 2 | 0.034 | -0.154 | 0.744 | ||
| Prokinesis at Gape 1 | -0.429 | 0.143 | 0.639 | ||
| Lower bill at Gape 1 | -0.041 | -0.004 | 0.513 | ||
| Rhynchokinesis at Gape 2 | -0.107 | 0 | -0.474 | ||
| Prokinesis level | -0.635 | 0.089 | 0.469 | ||
| Difference neck neck | 0.230 | 0.390 | 0.437 | ||
| Food level s.d. | 0.028 | -0.298 | -0.427 | ||
| Food level | 0.457 | -0.317 | -0.419 | ||
| . | Principal component . | . | . | ||
|---|---|---|---|---|---|
| Parameter . | PC1 (33%) . | PC2 (25%) . | PC3 (8%) . | ||
| PC1 | |||||
| Gape period | 0.970 | 0.168 | 0.017 | ||
| Head elevation period | 0.970 | 0.135 | 0.012 | ||
| Head elevation moment | 0.968 | 0.166 | 0.002 | ||
| Food period | 0.968 | -0.062 | 0.019 | ||
| Food 2 moment | 0.965 | 0.136 | 0.027 | ||
| Gape 2 moment | 0.963 | 0.219 | 0.025 | ||
| Lower bill 2 moment | 0.963 | 0.209 | 0.059 | ||
| Lower bill period | 0.959 | 0.164 | -0.023 | ||
| Difference head elevation | 0.741 | -0.617 | -0.145 | ||
| Gape 1 | 0.734 | -0.462 | -0.088 | ||
| PC2 | |||||
| Gape 2 | -0.052 | 0.914 | 0.051 | ||
| Neck neck moment | 0.361 | 0.885 | 0.072 | ||
| Neck neck period | 0.364 | 0.877 | 0.085 | ||
| Throat moment | 0.421 | 0.860 | 0.168 | ||
| Gape level | 0.200 | 0.829 | -0.073 | ||
| Lower bill at Gape 2 | -0.482 | 0.804 | 0.203 | ||
| Head X moment | 0.514 | 0.748 | 0.017 | ||
| Lower bill level | -0.142 | 0.721 | 0.410 | ||
| PC3 | |||||
| Prokinesis at Gape 2 | 0.034 | -0.154 | 0.744 | ||
| Prokinesis at Gape 1 | -0.429 | 0.143 | 0.639 | ||
| Lower bill at Gape 1 | -0.041 | -0.004 | 0.513 | ||
| Rhynchokinesis at Gape 2 | -0.107 | 0 | -0.474 | ||
| Prokinesis level | -0.635 | 0.089 | 0.469 | ||
| Difference neck neck | 0.230 | 0.390 | 0.437 | ||
| Food level s.d. | 0.028 | -0.298 | -0.427 | ||
| Food level | 0.457 | -0.317 | -0.419 | ||
For PC1 and PC2, only parameters with loadings higher than 0.7 are selected; for PC3, parameters with loadings higher than 0.4 are selected. Percentages indicate the explained variance on each PC.