Intra-tropical movements as a beneficial strategy for Palearctic migratory birds.

For the central population, the NDVI of the first site when occupied was higher than at the second site when occupied (estimate: –0.057 ± 0.024 s.e., p = 0.022, figure 3 a ); NDVI of the first and second sites when occupied did not differ in the southeastern population (estimate: 0.001 ± 0.031 s.e., p = 0.982, figure 3 a ). When present at the first site, the mean NDVI at the still unoccupied second sites of the southeastern population was significantly higher compared to the first sites (estimate: 0.098 ± 0.031 s.e., p = 0.003, figure 3 a ), and this relationship was marginally insignificant for the central population (estimate: 0.044 ± 0.024 s.e., p = 0.075, figure 3 a ).

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