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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Landscape ecology 8 (1993), S. 155-162 
    ISSN: 1572-9761
    Keywords: Contagion index ; spatial pattern ; probability ; information index ; landscape ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A contagion index was proposed by O'Neill et al. (1988) to quantify spatial patterns of landscapes. However, this index is insensitive to changes in spatial pattern. We present a new contagion index that corrects an error in the mathematical formulation of the original contagion index. The error is identified mathematically. The contagion indices (both original and new) are then evaluated against simulated landscapes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9761
    Keywords: landscape ecology ; simulation ; index ; wildlife habitat ; forest management ; fragmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study examines effects of different forest cutting patterns on habitat fragmentation in managed forest landscapes. We use computer simulation to conduct experiments in which we examine effects of different cutting patterns, cutting-unit size, and special constraints (e.g., a forest reserve, a stream system, or a road system) on landscape patterns. Fragmentation indices are used to quantify structural changes over the cutting cycle and among different treatments of the experiments. Degree of fragmentation varies greatly among the five cutting patterns used; aggregation of cutting units results in low degree and gradual change of fragmentation. Cutting patterns with larger cutting units and additional landscape constraints also lead to lower degree of fragmentation. Moreover, differences in fragmentation among the treatments are not observed until 30% or 50% of the landscape is cut.
    Type of Medium: Electronic Resource
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