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An annotated species list of the alien vascular plant flora of the Cape of Good Hope Nature Reserve is presented. The flora comprises five gymnosperm and 68 angiosperm species that are definitely alien to the reserve and four angiosperm species that are possibly alien. The life-form distribution of the alien flora is shown to be significantly different from that of the indigenous flora; trees, shrubs and annual herbs are more important in the alien flora, and dwarf shrubs and perennial herbs are much less important. Biotic factors are suggested as being important in determining the success of alien invasions, in particular grazing by ungulates. The invasion rate is currently about one new species per year. By ceasing to introduce tree species and by restricting human disturbance, the rate of invasion of new species could be reduced. ’n Benaamde lys van die uitheemse vaatplantsoorte van die Kaap die Goeie Hoop Natuurreservaat word aangebied. Die flora bestaan uit vyf gimnosperm- en 68 angiospermsoorte wat sonder twyfel uitheems is en vier angiospermsoorte wat moontlik uitheems is. Daar word aangedui dat die lewensvormverspreiding van die uitheemse flora opvallend van dié van inheemse plantegroei verskil; bome, struike en eenjarige kruide is van meer belang by die uitheemse flora terwyl dwergstruike en meerjarige kruide baie minder belangrik is. Dit wil voorkom of biotiese faktore, veral beweiding deur hoefdiere, ’n belangrike rol kan speel by die indringing van uitheemse plante. Tans word die tempo van indringing op ongeveer een nuwe spesie per jaar geskat. Deur die invoer van boomsoorte te staak en versteuring deur mense te beperk, kan die indringingstempo van nuwe plantsoorte verminder word.
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Macdonald et al. (1987) studied this question.
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