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  • endemism  (2)
  • 1995-1999  (2)
  • 1980-1984
  • 1
    Electronic Resource
    Electronic Resource
    Modelling the biological aspects of local endemism in South African Fynbos (1995)
    Springer
    Plant systematics and evolution 195 (1995), S. 137-147 
    Details
    ISSN: 1615-6110
    Keywords: Fynbos ; endemism ; dispersal ; growth form ; regeneration ; logistic regression analysis ; model ; Flora of the Cape
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The biological attributes, dispersal mode, growth form, and regeneration strategy were determined for the endemic and non-endemic flora of the southern Langeberg, Cape Province, South Africa.—Logistic regression analysis was used to assess the simultaneous effects and interactions between these biological attributes on the occurrence of endemism. The model allowed numerical estimation of the probability that a species with a given set of attributes would be endemic.—This approach extends a contingency table analysis of the data, which merely indicated the association between individual biological traits and endemism. Furthermore, the logistic model allows scope for the analysis of the influence of biological traits in determining endemism in other floras, and also tentative prediction of the probability of endemism in species with combinations of biological traits not yet observed in the flora of the southern Langeberg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989290
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  • 2
    Electronic Resource
    Electronic Resource
    Profiling a besieged flora: endemic and threatened plants of the Cape Peninsula, South Africa (1996)
    Springer
    Biodiversity and conservation 5 (1996), S. 575-589 
    Details
    ISSN: 1572-9710
    Keywords: Cape Peninsula ; fynbos ; endemism ; rarity ; taxonomic profile ; biological profile ; threats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Cape Peninsula (area: 471 km2), situated at the south-western extremity of the Cape Floristic Region, has exceptionally high plant species richness (2285 species and infraspecific taxa) and numbers of endemic (90; 88 species and two infraspecific) and threatened (141; 138 species and three infraspecific) taxa (termed species from here on). This biodiversity is threatened by urban development and the spread of invasive alien plants. Peninsula endemics are concentrated in a few, predominantly species-rich families and these correspond well with endemic-rich families in other areas of the Cape Floristic Region. A high level of similarity exists between families with threatened and families with endemic species. A frequency analysis of the biological traits of both endemic and threatened species shows that low growing, ant-dispersed shrubs are over-represented in both groups. Endemics are most likely to be non-sprouters, but threatened plants do not have a specific post-fire regeneration strategy. Threatened species have higher frequencies of geophytes, sprouters and wind-dispersed species compared to endemic species. Numbers of endemic and threatened species are not randomly distributed with regard to occurrence in vegetation types and patterns are similar for both groups. The habitat and biological profiles of both endemic and threatened species suggest that they are highly vulnerable to extinction as a result of increasing rates of alien plant infestation, urbanization and inappropriate fire regimes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00137610
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    Paper (German National Licenses)
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