Succession: Symposium on advances in vegetation sciences, by Hugo Sjörs (auth.), Eddy van der Maarel (eds.)

By Hugo Sjörs (auth.), Eddy van der Maarel (eds.)

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Extra resources for Succession: Symposium on advances in vegetation sciences, Nijmegen, The Netherlands, May 1979

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A relative increase of the participation of identified individuals up to ~ of the population composition in the optimal stage, falling to about t in the terminal stage (Figs. 1 in terminal stage ;/ from prevalence of male individual-.. via equilibrium to prevalence of female ones (Fig. 1D Fn1l ~ 1-2 _fIlS 2 T 3 I 4 Ptrl~~~~r~~ herbs ono I K~TI(JfI 5-12 2-5 5 I 6 ~. ,. dN) ' . :-. ::::;::::::: .. Fort sl moss and herbs FornI trllS : Populu$ tr_ PIuo _ . ~ and denSIty (n) 01 populatoon J(I '3000 2(1 ·2000 ~ 1000 =_ ~,~--.

2a). e. on the gradients that go from short fynbos to tall fynbos (Fig. 1). This higher beta diversity on the short to tall fynbos gradients probably occurs because (a) the tall fynbos contains a set of tall species that are absentTrom the short fynbos. Most should have been present in the short low altitude fynbos but the seed regenerating species have undergone local extinction due to too frequent burning; (b) the tall fynbos is lacking in a set of short shrubs and graminoids because of overtopping.

That fire is not very important in determining beta diversity, is suggested by the phytosociological study ofWerger, Kruger & Taylor (1972) in fynbos of the same catchment area. Stands of widely different structure, presumably due to fire, were placed in the same floristic association because of their similarity in species composition. On the temporal gradient the beta diversity is higher at low altitudes than at high altitudes and on the altitude gradient the beta diversity is higher in the old fynbos (Fig.

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