Table 2.
List of dependent variables and of temporal and spatial covariates included in linear models of factors explaining variation in post- and pre-breeding migration features
| Dependent variable | Temporal covariates | Spatial covariates |
|---|---|---|
| Post-breeding migration | ||
| Length of migration path (LMPpob) | DDc | – |
| Path straightness (PSpob) | DDc | – |
| Migration speed (MSpob) | DDc | PSpob |
| Latitude of the first stationary period (Lat-SPf) | DDc, MSpob | PSpob |
| Longitude of the first stationary period (Lon-SPf) | DDc, MSpob | PSpob |
| Arrival date to the first stationary period (ADsp) | DDc, MSpob | PSpob, Lat-SPf, Lon-SPf |
| Pre-breeding migration | ||
| Departure date from the last stationary period (DDsp) | ADsp | Lat-SPl, Lon-SPl |
| Length of migration path (LMPprb) | DDsp | Lat-SPl, Lon-SPl |
| Path straightness (PSprb) | DDsp | Lat-SPl, Lon-SPl |
| Migration speed (MSprb) | DDsp | PSprb, Lat-SPl, Lon-SPl |
| Arrival date to the breeding colony (ADc) | DDsp, MSprb | PSprb, Lat-SPl, Lon-SPl |
Spatial and temporal covariates were included to assess the carry-over effects of previous migration events/route features on specific migration features. DDc Departure date from the colony site