Figure 2

Change in NDVI during two weeks around migration events of the nine male nightingales. Departure from non-breeding site (T_{DEP_NB}), arrival at (T_{ARR_S}) and departure from the spring stopover site (T_{DEP_S}) as well as arrival at breeding site (T_{ARR_B}). Three asterisks and one asterisk indicate high (p ≤ 0.001) and moderate (p ≤ 0.01) significance of difference from zero in a t-test, respectively.