Ecological specialization matters: long-term trends in butterfly species richness and assemblage composition depend on multiple functional traits

Aim To quantify spatio‐temporal changes in species richness and assemblage composition of Danish butterflies over more than 100 years and to assess whether different functional groups of butterflies show different temporal trajectories. Location Denmark, Europe. Methods We applied species accumulation curves to estimate relative species richness changes from unequally sampled occurrence records, collected over more than a century (1900–2012), at...