Figure 3

Correlations between breeding site phenology and the timing of individual migration events. The time difference between arrival and spring green up at the breeding site (T_{ARR_B} – t_SPRING) in relation to migration timing (top left and right) and to resource phenology at the breeding site (bottom left and right). Significant positive relation between T_{ARR_B} – t_SPRING and departure from the non-breeding site (T_{DEP_NB}; top left), arrival at the breeding site (T_{ARR_B}; top right) and time difference between arrival and the date when insects start to develop at the breeding site (T_{ARR_B} – t_BDT; bottom left). Significant negative relation between T_{ARR_B} – t_SPRING and the time difference between the end of the offspring’s peak food requirement and the end of larvae availability (T_{ARR_B}* – t_DD; bottom right). At each solid regression line the corresponding confidence interval (grey shaded area) and confidence limits (dotted lines) are given. For the test statistics see main text.