Figure 3
Location of storks at both ends of the straits of Gibraltar (i.e. European shore at departure, and African shore upon arrival) in relation to their previous locations and concurrent zonal winds during southbound migration. Location represents east or west deviations (positive and negative values respectively) from the mean population longitude at the three milestones characterizing oversea migration routes: the European hinterland, the European (departure) shore, and the African (arrival) shore. Circles represent observed data and lines represent model predictions under three illustrative zonal wind scenarios: westerlies (dotted red lines; 6 m/s), lack of zonal winds (filled black line; 0 m/s) and easterlies (dashed blue lines; 3 m/s). The location of birds when they entered the European hinterland and the concurrent zonal winds therein predicted storks´ subsequent location in the European shore (A) and in the African shore (B). The latter was best predicted storks´ location in the European shore and the concurrent winds therein (C).
