DCA ordination biplots of northern Apennine wetland sites (A – lacustrine; B – palustrine). Change in altitude (m) along the first two DCA axes is expressed as an attribute plot based on the GAMs (in red in the online version of the paper). Ch = chamaephytes; G = geophytes; H = hemicryptophytes; Hy = hydrophytes; P = phanerophytes; T = therophytes. For species name abbreviations see Appendix 1.