Table 2 Variables used to describe the shape of SES trajectories
From: Three-dimensional space use during the bottom phase of southern elephant seal dives
Variable name | Brief description |
|---|---|
Mean depth | Average depth in the bottom phase. |
Total dispersion | Sum of the eigenvalues: λ 1+λ 2+λ 3 |
First main component dispersion | Defined as \(\frac {\lambda _{1}}{\lambda _{1} + \lambda _{2} + \lambda _{3}}\) |
Vertical and horizontal extent of first main component | These two variables describe the extent of SES exploration along the path of the first main component. See details in text. |
Vertical and horizontal width | These variables quantify the vertical and horizontal spread of the deviations from the first main component path. See details in text. |
Swimming speed variability | Standard deviation of SES swimming |
| Â | speed. See details in text. |