Table 1.
Summary statistics of individual migration tracking data
| Variable | Prebreeding migration |
Postbreeding migration |
||||
|---|---|---|---|---|---|---|
| Mean (SD) | Min–max | N | Mean (SD) | Min–max | N | |
| Departure | March 26 | 54–113 | 33, 34 | September 13 | 222–310 | 12, 8 |
| 84.6 (12.2) | 256.5 (26.5) | |||||
| Arrival | May 5 | 88–165 | 35, 22 | November 28 | 321–359 | 9, 6 |
| 125.0 (15.4) | 332.8 (11.6) | |||||
| Duration (days) | 41.8 (16.0) | 5–80 | 31, 22 | 70.2 (19.8) | 40–94 | 8, 6 |
| Total migration distance (km) | 3,504 (1,729) | 344–6,404 | 35, 22 | 3,958 (1,600) | 1,403–6,642 | 15, 10 |
| Migration speed (km/day) | 88.0 (37.0) | 6.5–154.2 | 31, 22 | 59.8 (18.2) | 28.6–83.7 | 8, 6 |
| Track straightness | 0.91 (0.07) | 0.64–0.99 | 35, 22 | 0.94 (0.04) | 0.87–0.99 | 15, 10 |
Departure and arrival dates are reported as days since January 1 (Day 1 = January 1); mean values are also reported as calendar dates for ease of reference. Sample size (N) shows both the number of data points and the number of individuals.