Figure 1. The relationship between risk score (with no scaling mechanism) and annual population growth rate of 52 forest bird species.

Species with different migration strategies are presented separately: a) non-migratory (y = −0.002x+0.03, r² = 0.29); b) within Europe migrants (y = −0.001x+0.02, r² = 0.09); c) wintering outside Europe (y = −0.002x+−0.005, r² = 0.07). The sizes of data points are proportional to the standard error of population growth rate estimate, with larger points having smaller standard error and thus greater weight in models. Relationships were tested concurrently with migration strategy as a separate term in the model (P = 0.01, see text for details).