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Why are bird migration dates shifting? A review of weather and climate effects on avian migratory phenology

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Figure

Fig. 1. Locations of recent studies on long-term changes in bird migratory phenology and climate change in Europe (a) and North America (b; see reference list)
Fig. 2. (a) Main events in the life cycle of a migratory bird between pre- and post-nuptial migration
Fig. 3. Potential impacts of climate on the arrival date of a migratory bird species. This would be valid both for spring and autumn migration
Fig. 4. Hirundo rustica. Effect of the Sahel index during the rainy season on barn swallow arrivals in Spain in the following spring
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