Figure 2. Spatial distribution of data. Panel (a) shows the
location of butterfly transect (n= 158) and moth traps (n = 93) where
phenological data on the 289 species used in this study had been
collected during 1999-2017 and 1993-2017 for the butterflies and moths ,
respectively. Panel (b) and (c) show the locations with observational
data for T1 and T2, respectively, with
samples size per coordinate depicted by different shades of green, on
the 289 species used for calculating shifts in the northern range
boundary. Longitude and latitude in the ETRS89 coordinate system. Also
see Fig. S1 for the temporal span of the data sets used in this study.