Table 3 Summary statistics (mean ± SE) of migration timing, route features and movement patterns (see Methods) for different groups of individuals
|  | Individuals included in statistical analyses (years 2010–2011, sample size in brackets) | Individuals with non-breeding areas south of 10° S, (n = 4) | Individuals from year 2012 (n = 2) |
|---|---|---|---|
Post-breeding migration | |||
Departure date (DDc) | 250.77 ± 0.75 (81) | 250.25 ± 0.63 | 253.5 ± 0.5 |
Length of migration path (LMPpob) (km) | 5557.78 ± 83.81 (81) | 8712.85 ± 794.99 | 5191.83 ± 629.93 |
Path straightness (PSpob) | 83.88 ± 0.78 (81) | 86.51 ± 1.71 | 91.16 ± 4.11 |
Migration speed (MSpob) (km day−1) | 207.65 ± 7.59 (81) | 187.92 ± 10.43 | 248.35 ± 72.92 |
Duration of migration (DMpob) (d) | 29.52 ± 1.09 (81) | 46.42 ± 3.53 | 23.69 ± 9.49 |
Latitude of the first SP | 4.48 ± 0.40 (83) | − 21.11 ± 5.11 | 3.65 ± 3.05 |
Longitude of the first SP | 12.27 ± 0.56 (83) | 20.58 ± 1.46 | 16.33 ± 1.70 |
Arrival date to the first SP (ADsp) | 280.09 ± 0.99 (81) | 296.50 ± 3.75 | 277.00 ± 9.00 |
Sub-Saharan Africa itinerancy | |||
Latitude of the main non-breeding SP | 4.33 ± 0.40 (83) | − 26.73 ± 3.012 | 3.65 ± 3.05 |
Longitude of the main non-breeding SP | 12.45 ± 0.58 (83) | 23.53 ± 2.78 | 16.33 ± 1.70 |
Duration of stay | 163.51 ± 1.38 (56) | 141.53 ± 7.05 | 159.52 ± 9.00 |
Path length (km)a | 990.65 ± 165.42 (8) | – | – |
Movement speed (km day−1)a | 6.68 ± 1.29 (8) | – | – |
Path straightnessa | 92.72 ± 4.18 (8) | – | – |
Pre-breeding migration | |||
Latitude of the last stationary period | 4.48 ± 0.41 (83) | − 25.79 ± 2.26 | 3.65 ± 3.05 |
Longitude of the last stationary period | 12.31 ± 0.57 (83) | 24.69 ± 2.73 | 16.33 ± 1.70 |
Departure date from the last SP (DDsp) | 80.10 ± 1.48 (58) | 72.50 ± 6.59 | 70 ± 0 |
Length of migration path (LMPprb) (km) | 6154.64 ± 131.37 (58) | 9358.12 ± 591.14 | 5184.49 ± 72.92 |
Path straightness (PSprb) | 76.83 ± 1.48 (58) | 87.27 ± 4.58 | 90.80 ± 0.16 |
Migration speed (MSprb) | 296.47 ± 15.53 (57) | 239.89 ± 33.02 | 243.57 ± 19.02 |
Duration of migration (DMprb) (d) | 23.69 ± 1.26 (57) | 40.80 ± 4.94 | 21.28 ± 0.00 |
Arrival date (ADc) | 104.84 ± 1.51 (57) | 114.00 ± 5.70 | 92 ± 0 |