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Spatiotemporal Variation in Avian Migration Phenology: Citizen Science Reveals Effects of Climate Change

Figure 4

Geographic variation in phenological response and example trajectories of temperature and arrival date.

Geographic variation in the mean shift in arrival date per °C change in minimum spring temperature for four bird species (right-hand column). The left-hand column depicts changes in both minimum spring temperature (solid line) and arrival date (dashed line) through time for one example region (indicated by arrow) for each species. Note that the arrival date axis increases towards the bottom. Photo credits: red-eyed vireo, Dario Sanches; scarlet tanager, Steve Maslowski; great-crested flycatcher, Matt Ward; indigo bunting, Kevin Bolton.

Figure 4