Road Verge and Rangeland Plant Communities in the Southern Karoo: Exploring What Influences Diversity, Dominance and Cover |
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Authors: | P J O’FARRELL S J MILTON |
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Institution: | (1) Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, 7700, South Africa;(2) The Lesley Hill Institute for Plant Conservation, Botany Department, University of Cape Town, Rondebosch, 7700, South Africa |
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Abstract: | Road verges in the Prince Albert district, South Africa were examined to determine whether they are important refugia for
plant species in the Karoo biome. Vascular plants at 50 sites on road verges were compared with those plant communities in
the adjacent grazed rangelands. Verges were found to support a greater mean number of species, total plant cover, and number
of individual plants. Road verges were found to contain 11 unique species compared with 20 unique species in rangelands. Plant
community composition varied with more forbs and succulents on the verge and more shrubs in the rangeland. Significantly greater
cover of unpalatable plants was found on the ungrazed road verge, and no difference in palatable and highly palatable plant
cover was recorded, indicating that herbivory is not a major driver in defining community differences in these environments.
No significant differences in soil moisture or texture were found between verge and rangeland. We argue that road maintenance
and construction activities have an over-riding controlling influence on road verge community composition. Although it is
not possible to discount the possibility that road verges provide an important refuge for certain species, it appears that
they are disturbed environments that do not contribute significantly to the plant conservation needs of this biome. |
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Keywords: | Herbivory Karoo Plant community Rangeland Road maintenance Road verges Road verge width Soil moisture South Africa |
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