Table 2.
Average values of both movement and energetic parameters characterising each cluster, ordered by increasing P value
| Type | Variable name | Normality | Statistic | P value | Cluster 1 FII/SAW mean (± sd) | Cluster 2 FII mean (± sd) | Cluster 3 RES mean (± sd) | Cluster 4 SAW mean (± sd) |
|---|---|---|---|---|---|---|---|---|
| Movement | Mean speed (m s-1) | Yes | 13.01 | <0.001,* | 7.76 (± 1.03) | 9.91 (± 1.37) | 4.6 (± 0.82) | 4.58 (± 1.55) |
| Behavioural | RELOCA (%) | Yes | 15.23 | <0.001,* | 48.53 (±4.22) | 61.52 (± 5.03) | 23.89 (± 5.96) | 28.43 (± 8.29) |
| Behavioural | RESTIN (%) | No | 8.889 | 0.031,* | 9.73 (± 2.52) | 14.27 (± 8.52) | 51.46 (± 3.26) | 21.05 (± 7.03) |
| Movement | Foraging range (km) | No | 7.594 | 0.055,* | 463.6 (± 188.35) | 703.02 (± 333.58) | 161.48 (± 101.87) | 307.05 (± 328.59) |
| Movement | Maximum speed (m s-1) | No | 6.997 | 0.072,* | 26.57 (± 2.03) | 42.36 (± 25.72) | 54.44 (± 26.02) | 25.09 (± 7.54) |
| Behavioural | INTSER (%) | Yes | 2.97 | 0.1,** | 30.73 (± 5.13) | 16.99 (± 1.81) | 14.48 (± 5.22) | 40.73 (± 6.67) |
| Energy | Daily energy expenditure (kJ day-1) | Yes | 2.49 | 0.13,** | 3.88 (± 0.36) | 3.6 (± 0.55) | 3.58 (± 0.23) | 3.51 (± 0.42) |
| Energy | Daily net energy gain (kJ day-1) | Yes | 2.09 | 0.17,** | 5.06 (± 3.94) | 6.59 (± 6.27) | 1.47 (± 2.3) | 10.57 (± 7.05) |
| Movement | Trip duration (h) | Yes | 1.84 | 0.19,** | 53 (± 19.64) | 40.05 (± 0.06) | 18.53 (± 0.23) | 38.9 (± 12.84) |
| Energy | Daily energy gain (kJ day-1) | Yes | 1.88 | 0.19,** | 13.41 (± 5.7) | 15.28 (± 9.08) | 7.58 (± 3.79) | 21.11 (± 10.22) |
| Behavioural | EXTSER (%) | No | 4.269 | 0.23, NS | 11.01 (± 1.47) | 7.22 (± 3.23) | 10.17 (± 4) | 9.79 (± 6.67) |
| Energy | Mean prey weight (g) | No | 3.126 | 0.37, NS | 337.29 (± 139.77) | 466.56 (± 340) | 177.86 (± 61.01) | 332.44 (± 301.28) |
| Energy | Number of prey per day | No | 3.076 | 0.38, NS | 0.01 (± 0.01) | 0.01 (± 0.01) | 0.01 (± 0.01) | 0.02 (± 0.01) |
| Energy | Foraging efficiency | No | 2.573 | 0.46, NS | 2.34 (± 2.01) | 8.72 (± 12.26) | 1.18 (± 0.12) | 4.97 (± 3.09) |
| Energy | Sd of prey weight (g) | No | 2.436 | 0.48, NS | 334.36 (± 146.75) | 389.19 (± 283.87) | 157.39 (± 137.42) | 540.31 (± 573.91) |
| Energy | Mass at departure (kg) | Yes | 0.22 | 0.64, NS | 9.4 (± 0.93) | 8.95 (± 1.04) | 9.3 (± 0.28) | 9.08 (± 1) |
An ANOVA (when normally distributed) or a non-parametric Kruskal-Wallis test was applied (indicated by Normality column: yes or no) for selecting the most significant parameters (behavioural, movement and energetic) characterising clusters. Significance was set at P < 0.1 (*) and marginal significance to P < 0.2 (**), whereas higher values were not significant (NS). FII: foraging-in-flight. SAW: sit-and-wait. RES: resting.