Browsing by Author "Mucina, L."
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- ItemFrontiers of vegetation science : an evolutionary angle(International Association for Vegetation Science, 2008) Mucina, L.; Kalwij, J. M.; Smith, V. R.; Chytry, M.; White, P. S.; Cilliers, S. S.; Pillar, V. D.; Zobel, M.; Sun, I-F.The main focus of the symposium is to seek links between vegetation science and evolutionary biology and the formation of platforms in cooperation between these major scientific fields. The title of our meeting – “Frontiers of Vegetation Science—An Evolutionary Angle”– alludes symbolically to the challenges that vegetation science as a discipline is currently facing. Technologically driven progress in evolutionary research is changing the face of many traditional biological sciences. Vegetation science, should (and to some extent already does) react to this new phase of evolutionary research by reaching out to ecological disciplines traditionally closer to evolutionary biology (population biology, palaeo-ecology) and implementing tools of evolutionary research in explaining structure and dynamics of vegetation. The field of interaction and cooperation is enormous and is ripe for exploration and discovery. The major aim of our meeting is to extend the interface and to deepen the cooperation between the evolutionary research and vegetation science.
- ItemA river runs through it: Land-use and the composition of vegetation along a riparian corridor in the Cape Floristic Region, South Africa(Elsevier Ltd., 2010) Meek, C.S.; Richardson, D.M.; Mucina, L.Riparian zones are important for the many ecosystem services they supply. In settled areas, the vegetation of such zones is shaped by human land-use; this often creates conditions under which alien plant species thrive. Alien plants have been shown to induce large-scale changes in riparian habitats, and they pose a major threat to the continued provision of key ecosystem services. We used direct gradient analysis to assess correlations between land-use and the composition of vegetation along a riparian river corridor in the highly transformed landscape surrounding Stellenbosch in South Africa’s Western Cape Province. Vegetation plots were sampled along the entire length of the river from headwaters to estuary (ca. 40 km). Plant community composition was analyzed in relation to land-use data collected in the field, and additional land-use variables computed from digital land-cover data. Patterns of plant community structure were found to be directly related to land-use, with measures of cover, richness, and diversity differing significantly among land-use types. Portions of the riparian zone adjacent to agricultural land had the greatest level of alien plant cover, while areas bordered by urban land maintained the highest alien species richness. Areas adjacent to grazing and natural lands showed intermediate and low levels of invasion, respectively. Several native species were found to persist in areas with high abundance and diversity of invasive alien plants, suggesting that they will be valuable focal species for future restoration attempts. Due to the level of human-mediated change in many areas of the riparian zone, restoration to historic conditions over most of the river is not considered feasible. These areas should be recognized as examples of novel ecosystems, and management efforts should focus on restoring or creating desirable ecosystem functions, rather than on achieving assemblages comprising only native species.
- ItemVegetation of the coastal fynbos and rocky headlands south of George, South Africa(AOSIS, 2000) Hoare, D. B.; Victor, J. E.; Lubke, R. A.; Mucina, L.ommunity structure and composition of the coastal fynbos and rocky headland plant communities south of George, southern Cape, were studied. Vegetation was analysed using standard sampling procedures of the floristic-sociological approach of Braun-Blanquet. The releve data were subject to TWIN SPAN-based divisive classification, and ordinated by Principal Coordinates Analysis with the aim to identify vegetation coenocline subsequently interpreted in terms of underlying environmental gradients. Most of the sampled vegetation was classified as coastal fynbos. The Leucadendron salignum-Tetraria cuspidata Fynbos Community was found to occupy sheltered habitats, whereas the Relhania calyci- na-Passerina vulgaris Fynbos Community was found in exposed habitats The other two communities characterise strongly exposed rocky headlands. The Pterocelastrus tricuspidatus-Ruschia tenella Community is wind-sheared scrub, and the Gazania rigens- Limonium scabrum Rocky Headland Community is a loose-canopy, low-grown herbland, characterised by the occurrence of partly salt-tolerant and succulent herbs. The ordination of the fynbos communities revealed a horseshoe structure allowing a direct recognition of a coenocline spanning two fynbos communities along the Axis 1 interpreted in terms of exposure to wind and salt spray. A considerable amount of alien plant infestation was also present. This appears to be the largest threat to the continued existence of this coastal fynbos.