Table 3.
Correlation coefficients (Pearson’s r) between pre- and postbreeding migration characteristics and latitude of departure, latitude of destination (partial correlation controlling for minimum migration distance), and minimum migration distance
| Variable | Departure latitude | Destination latitude | Minimum migration distance |
|---|---|---|---|
| Prebreeding migration | |||
| Departure | −0.04 (24) | −0.47 (22)* | −0.10 (22) |
| Arrival | −0.17 (22) | −0.29 (22) | 0.38 (22) |
| Duration (days) | −0.10 (22) | 0.12 (22) | 0.43 (22)* |
| Total migration distance (km) | −0.25 (22) | −0.07 (22) | – |
| Migration speed (km/day) | −0.24 (22) | −0.13 (22) | 0.66 (22)** |
| Track straightness | −0.02 (22) | 0.24 (22) | 0.15 (22) |
| Postbreeding migration | |||
| Departure | −0.13 (8) | 0.12 (8) | −0.87 (8)** |
| Arrival | −0.67 (6) | 0.77 (6) | −0.41 (6) |
| Duration (days) | −0.05 (6) | 0.06 (6) | 0.80 (6) |
| Total migration distance (km) | −0.02 (10) | −0.13 (10) | – |
| Migration speed (km/day) | 0.20 (6) | −0.24 (6) | 0.64 (6) |
| Track straightness | −0.09 (10) | 0.24 (10) | −0.42 (10) |
The number of individuals is reported in brackets. Statistically significant correlation coefficients are highlighted in boldface. Significance level was conservatively determined according to the number of individuals (see “Materials and Methods” section). The correlation between total migration distance and minimum migration distance was not shown as it was redundant (r > 0.98).
*
P < 0.05;
**
P < 0.01.