Conversion of species responses into categories
The slope coefficients from the phenology models and the estimates of NRB shift in kilometers formed our main results and are hereafter jointly referred to as the responses (as in climate change response). To enable a comparison of directionality in responses, we converted the continuous results into categories (Table 1). For the sake of visualization in Fig. 3, and in order to calculate the percentage of species with population trends in different directions, population trends were also assigned into similar categories: a significantly positive trend was assigned into the “Positive” group; an insignificant trend with any sign into the “Stable” group; and a significantly negative trend into the “Negative” group.