Functional traits and abundance change of 40 alpine and subalpine species on two GLORIA summits in the Northern Apennines (Italy)

Species-level data on abundance change (Cliff’s delta, 2001–2022) and 13 vegetative, seed and germination traits measured in situ for 40 alpine and subalpine species on two GLORIA summits (Pian Cavallaro and Alpe di Mommio) in the Northern Apennines, Italy. The file includes a README sheet describing all variables, units and codes. These data support the article “Seed mass, germination timing and specific leaf area help explain abundance change in alpine plants over two decades of warming” (Tognela et al., submitted to Environmental and Experimental Botany).