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.