Taxonomic composition of vascular plant communities across time since deglaciation (tsd in years) at tidewater (a) and inland (b) glacier sites. The two first components of a non-metric multidimensional scaling (NMDS) from an ordination on the presence data at the transect level are mapped. Each circle, rectangle or triangle corresponds to a transect from a given site and deglaciation time (black to red). Small crosses represent the score of the ten most frequent species on the ordination plots.