Test statistics of fixed explanatory variables in full linear mixed models fitted on log FA measurements of four bird species.

Individual-specific (i.e. random) intercepts and slopes were included in all models, while non-significant interaction terms were removed. Significant p-values are visualized as p or p while * indicates p-values that remained significant after Bonferroni-correction for multiple testing.1df refers to degrees of freedom in the denominator (degrees of freedom in the numerator is always 1);2not modeled since two-factor interaction was significant.