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Environmental and Ecological Statistics

, Volume 6, Issue 3, pp 275–290 | Cite as

Twist number statistics as an additional measure of habitat perimeter irregularity

  • J. BogaertEmail author
  • P. Van Hecke
  • R. Moermans
  • I. Impens
Article

Abstract

Individual habitats are altered by the surrounding landscape matrix. Quantitative analysis of habitat boundary is therefore necessary. A shape index is proposed based on the perimeter twist number; twists divide the patch perimeter in seperate segments. Using Principal Components Analysis, the shape index is compared with fractal dimension (per-patch calculation based on area and perimeter) and with four shape (compactness) indices based upon pixel geometry, next to area and perimeter statistics. The analysis is executed with simulated data based on percolation maps. The proposed index can be used as a complementary shape descriptor because of (i) its independence of fractal dimension, (ii) its restricted correlation with only one compactness index and (iii) its ability to identify habitats characterized by limes divergens and a high interior-edge ratio.

fractal dimension habitat boundary landscape ecology limes convergens and divergens percolation map principal components analysis 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • J. Bogaert
    • 1
    Email author
  • P. Van Hecke
    • 1
  • R. Moermans
    • 2
  • I. Impens
    • 1
  1. 1.Department of Biology, Research Group of Plant and Vegetation EcologyUniversity of AntwerpWilrijkBelgium
  2. 2.Biometric UnitAgricultural Research CenterMerelbekeBelgium

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