Fig. 5

a), b) and c) Median dates of the post-nuptial migration. Dates indicate when 50% more encounters than expected from the capture/observation of stationary individuals have still to occur; they have been calculated on the whole (a) or the rarefied (b) ringing dataset, or the eBird dataset (c). Isolines represent areas where the mean migration date occurs at the same time (e.g., in (a) in the central part of Sicily the median date of post-nuptial migration occurs during the first ten-day period of November). Months are divided into ten-day periods (‘decades’ sensu the Key Concepts Document of the EU Birds Directive; e.g. Oct 1, Oct 2, Oct 3). Isolines labels should be interpreted as the first day of the corresponding decade, e.g. isoline OCT1 should be read as “01 October”, OCT2 as “11 October”, OCT3 as “21 October” and so on. d), e) and f) Sensitivity analyses associated with panels a), b) and c), respectively. Isolines include areas with the same sensitivity values (in days) of the estimated median date of the post-nuptial migration