Figure 7
From: Cues, strategies, and outcomes: how migrating vertebrates track environmental change
Spatially inconsistent changes in temperatures along the spring migratory route of pied flycatchers over the period from 1980 to 2001. These are the trends in temperatures eight days before (A), after (C) and on (B) the median date of passage of this species through Europe. The large advance in temperatures in northeastern Europe right after the birds’ arrival there is not paralleled by similar increases in the Iberian stopover sites (From Both 2010).