Network data have shown spatial variability, with differences between sites apparent.
At particular sites, the response of different species is distinct, often combined
with a strong seasonal variation (highest advances in early spring to almost
no response in summer and early autumn). Comparatively few studies have been
performed with autumn phenological phases, such as leaf colouring and leaf fall,
but in this season temporal changes seem to be less pronounced and show a more
heterogeneous pattern.