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Table 2 Results of generalised linear models to investigate (a) the similarity of petrel whole migrations within- and between-individuals and (b) the spatiotemporal similarity of within-individual petrel migrations when split into six equal stages, using earth mover’s distance (EMD) ‘effort’ values

From: Individual consistency in migration strategies of a tropical seabird, the Round Island petrel

Variable Estimate ± SE t value p value
(a) Whole migration EMD comparisons (R2 = 0.020)
 (Intercept) 1862.17 ± 19.17 97.14  < 0.001
 1 (Same individual)  − 1287.08 ± 39.38  − 32.69  < 0.001
 Difference in departure 2.15 ± 0.20 10.60  < 0.001
(b) Six stage EMD comparisons (R2 = 0.061)
(Intercept) 500.51 ± 62.80 8.0  < 0.001
 Stage*
  Stage 1 234.33 ± 90.04 2.6 0.01
  Stage 2 359.11 ± 98.47 3.6  < 0.001
  Stage 3 398.67 ± 101.20 3.9  < 0.001
  Stage 4 355.13 ± 98.20 3.6  < 0.001
  Stage 5 448.60 ± 104.67 4.3  < 0.001
  Stage 6 543.29 ± 111.35 4.9  < 0.001
 Difference in departure 3.94 ± 0.84 4.7  < 0.001
  1. Minimum adequate models are shown and categorical variables are being compared to reference levels; for the ‘same individual’ binary variable, this is 0 (different individuals), and for ‘stage’, this is the whole migration. Significant effects (p < 0.05) are highlighted in bold
  2. *The full pairwise comparisons for the categorical variable ‘stage’ can be found in Table S4