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Files in this Data Supplement:
Fig. S1. Effects of spring migration daylength on seasonal timing of European stonechats. Breeding, moult and migratory timing are based on Helm and Gwinner (Helm and Gwinner, 2005). Top panel shows daylength simulations. Birds were wintered under conditions of European-type short-distance migration (dotted line) and during the spring migration period, either remained under these (European-type; black line) conditions or were exposed to the slower daylength increase under Siberian-type long-distance migration (grey line). Middle panel shows testicular size and primary moult of birds exposed to Siberian-type (grey) or European-type (black) spring migration daylengths; data as in Fig..2. Bottom panel shows the daily mean duration of nocturnal migratory restlessness for the two groups.
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