Skip to main content

Table 1 Summary statistics of colony influence on maximum distance (km), path length (km), and duration (h)

From: Foraging movements of breeding Kelp Gulls in South Africa

Model Fixed factors Model estimates ± SE AICc DF R2m R2c
Log (Max distance) ~ Intercept    1152.41 3   
Log (Max distance) ~ Colony Intercept DW 1.94 ± 0.21 1108.95 8 0.26 0.31
Colony MA −0.17 ± 0.30     
Colony JU 0.07 ± 0.28     
Colony ST −1.66 ± 0.27     
Colony KE −1.79 ± 0.36     
Colony SW −1.58 ± 0.48     
Log (Path length) ~ Intercept    1161.91    
Log (Path length) ~ Colony Intercept DW 2.86 ± 0.20 1118.01 5 0.25 0.28
Colony MA −0.16 ± 0.29     
Colony JU 0.05 ± 0.27     
Colony ST −1.63 ± 0.26     
Colony KE −1.78 ± 0.35     
Colony SW −1.48 ± 0.47     
Log (Trip duration) ~ Intercept    906.09    
Log (Trip duration) ~ Colony Intercept DW 0.55 ± 0.15 888.43 5 0.14 0.21
Colony MA −0.03 ± 0.22     
Colony JU −0.01 ± 0.20     
Colony ST −0.80 ± 0.20     
Colony KE −0.71 ± 0.27     
Colony SW −0.88 ± 0.35     
  1. We used linear mixed-effect models with colony as fixed factors and bird ID as random intercept. All response variables were log transformed. Intercept DW is the intercept and the estimate for the Colony DW. Model estimates and standard errors are shown for the six colonies. We provided the marginal R2 which represents the variance explained by the fixed factors alone, and the conditional R2 which describes the variance explained by both the fixed and random factors. Colonies DW Dwarskersbos, MA Malgas Island, JU Jutten Island, ST Strandfontein, KE Keurbooms, SW Swartkops