Figure 5.

Distribution of the differences in niche overlap if migratory species had stayed year round in either the range they occupy from May to July (left column) or from December to February (right column) instead of migrating. Specifically, we measured overlap given migration minus overlap assuming no migration. If species migrate to track their environmental niche, positive values are predicted. Results are presented for (a) temperature and (b) EVI, and two measures of overlap: integral overlap and integral nestedness.