Aim This study investigates the main changes in bryophyte diversity and composition during the last 30,000 years in arctic and boreal ecosystems. Turnover in biological and ecological trait compositions of recorded bryophytes is assessed to explore changes in dominant life‐strategies and habitats. Location The study area covers Siberia and Alaska (55°–90° N, 50°–150° E and 40°–90° N, 150° E‐140° W). Taxon Bryophytes. Methods W...