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Table 1 Outcome of the multiple regression models for Garden Warblers (Sylvia borin) and European Robins (Erithacus rubecula) using the full dataset

From: Effects of body condition and food intake on stop-over decisions in Garden Warblers and European Robins during spring migration

Multiple regression modelsa Effect size Standard error t value Pr(>|t|)
Zugunruheb
  Garden Warbler
    (Intercept) 1.064 0.329 3.231 0.002
    CONDITIONc 0.384 0.147 2.613 0.012*
    Food intake 0.189 0.115 1.646 0.105
    Logger −0.433 0.214 −2.025 0.048*
    Elapsed time 0.021 0.077 0.268 0.790
    CONDITION: food intake 0.118 0.156 0.753 0.455
  Robin
    (Intercept) 0.859 0.171 5.025 0.000
    CONDITION 0.276 0.110 2.510 0.014*
    Food intake 0.087 0.129 0.677 0.500
    Logger −0.367 0.197 −1.861 0.067
    Elapsed time 0.186 0.058 3.219 0.002*
    CONDITION: food intake −0.027 0.132 −0.203 0.840
Diurnal activityd
  Garden Warbler
    (Intercept) 2.514 0.346 7.274 0.000
    CONDITION −0.479 0.154 −3.113 0.003*
    Food intake −0.303 0.121 −2.508 0.015*
    Logger 0.116 0.224 0.517 0.607
    Elapsed time −0.096 0.081 −1.181 0.243
    CONDITION: food intake −0.241 0.164 −1.470 0.147
  Robin
    (Intercept) 2.274 0.137 16.580 0.000
    CONDITION −0.158 0.088 −1.788 0.078
    Food intake 0.035 0.103 0.338 0.736
    Logger −0.217 0.158 −1.375 0.173
    Elapsed time −0.112 0.046 −2.424 0.018*
    CONDITION: food intake 0.071 0.106 0.667 0.507
  1. * Significant effects
  2. aThe dependent variables were Zugunruhe (migratory restlessness) and diurnal activity
  3. bStatistics of the models with Zugunruhe as dependent variable: Garden Warbler adj. R 2 = 0.192, F5,56 = 3.901, p of the model = 0.004; Robin adj. R 2 = 0.167, F5,79 = 4.375, p of the model = 0.001
  4. cCONDITION: a body condition index obtained by conducting a principal component analysis (PCA) on body mass, fat score, and muscle score at capture for each species
  5. dStatistics of the models with diurnal activity as dependent variable: Garden Warbler adj. R 2 = 0.284, F5,56 = 5.844, p of the model = 0.000; Robin adj. R 2 = 0.101, F5,79 = 2.894, p of the model = 0.019