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The 75 000 ha, hyper-arid area of Riemvasmaak represents one of the first land restitution cases in post-apartheid South Africa. People who were forcibly removed in 1974 were resettled in 1995. We ...

This study used a fence-line contrast approach to investigate the long-term impact of high grazing pressure on the vegetation at a site in Namaqualand, South Africa. Forty pairs of permanently mark...

Seed production and shrub association patterns of the twopalatable shrubs. Tripteris sinuatum and Tetragoma froticosa were investigated on heavily grazed communal and lightly grazed commercial rangeland in the succulent karoo. Namaqualand. Seed production in both these species was substantially reduced on the communal rangeland relative to the commercial rangeland. Seed production in T. sinuatum was most severely affected. with seed production on the communal rangeland two orders of magnitude lower than on the commercial rangeland. The proportion of T. sinuatum and T. froticosa shrubs growing unassociated with other shrubs on the communal rangeland was reduced by approximately 50%. Lycium ferocissimum was most effective as a refuge plant for T. sinuatum in terms of the mean seed production per plant. Ruschia robusta was however most important in terms of the overall amount of seed produced by T. sinuatum and T. froticosa on the communal rangeland. due to the large number of times this association occurred. Refuge plants did not appear to be particularly important for T. froticosa in terms of seed production, but were important in terms of providing safe sites for recruitment. The results of this study suggest that unpalatable or thorny species such as L. ferocissimum play an important role inproviding refuge sites for palatable species that might otherwise become entirely lost from overgrazed rangelands. African Journal of Range & Forage Science 17(1, 2&3): 22-26