... for wetland plants, there are 12 potential life history types (AS-I, AS-II, AD-I, AD-II, PS-I, PS-II, PD-I, PD-II, VS-I, VS-II, VD-I, VD-II) van der Valk gives examples of wetland species and ... Valk, A.G and Bliss, L.C 1 971 Canadian Journal of Botany 49: 1 177 –1199 Redrawn with permission.) © 2001 by CRC Press LLC L1 372 - Chapter 04/19/2001 8:59 AM Page 246 Succession in Coastal Wetlands ... communities, to floating-leaved and emergent communities, to a sedge meadow, and eventually to a shrub and forest community (van der Valk and Bliss 1 971 ) The trees and shrubs were wetland species, such...