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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 10 (1986), S. 119-124 
    ISSN: 1432-1009
    Keywords: Species-area relation ; Endangered plant species ; Topographic diversity ; Island biogeography ; Park design principles ; Southern Appalachians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Park design principles are proposed on the basis of consideration and analysis of rare plant species in Great Smoky Mountains National Park, USA. Rare species richness can be used as a simple measure of preservation success. A semilogartihmic species-area model for the Smokies was used in this analysis. Species richness would increase logarathmically with expansion of the national park area. An analysis of the relationship between species richness and the distribution of geologic and topographic features in the national park was also reported. An asymptotic relation was documented for the accumulation of newly recorded rare and endangered vascular plant species in the Smokies region up to 1978. Several multiple regression linear models predicted rare vascular plant species richness in Great Smoky Mountains National Park from area and topographic variates. Preserve design criteria can be based upon species-area, environmental gradient, and natural features distribution patterns for the specific taxa and biogeographic region under consideration. In addition, natural history characteristics for particular vulnerable species must be assessed. Rather than concentrating on the preservation of undocumented immigration and extinction processes, preserve design should be directed towards protecting geographic components and gradient patterns characteristic of a region.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5052
    Keywords: Abies ; Betula ; Compositional stability ; Gap phase dynamics ; Picea ; Southern Appalachians ; Transition probability analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Compositional stability in forests has traditionally been evaluated by comparing understory with overstory composition. Such comparisons have generally been qualitative. Transition probability analysis has recently allowed quantitative prediction of future community states. We used transition probability analysis of an undisturbed spruce-fir forest to evaluate the sensitivity of the overstory/understory comparison to underlying assumptions. The predictions of future composition differed widely depending on understory size class used, ecological situation (gap versus forest plots), and stand descriptor (density versus frequency). Species longevities and interactions between understory and overstory species also affected the predictions. Understory data generally led to a predicted increase in importance for the most tolerant species (Abies fraseri) and the conclusion that a previous disturbance allowed the least tolerant species (Betula lutea) to become established. Inventory of stems in gaps led to a predicted increase in importance for the least tolerant species (Betula) and the conclusion that disturbance frequency was increasing in the stand. Data incorporating more detailed observations of the gap capture process led to the inference that this old growth stand was in compositional equilibrium. In this community, the species that was densest in the understory species (Abies) had the shortest lifespan and thus, the fastest canopy turnover rate. This lead to counter-intuitive behavior in the models; in some cases Abies had a 40% higher relative density in the understory than in the overstory at equilibrium.
    Type of Medium: Electronic Resource
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