Increasing liana frequency in temperate European forest understories is driven by ivy. - Perring, Michael P; De Frenne, Pieter; Hertzog, Lionel R; Blondeel, Haben; Depauw, Leen; Maes, Sybryn L; Wasof, Safaa; Verbeeck, Hans; Verheyen, Kris (Frontiers in Ecology & the Environment, 2020)