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The distribution of species: Edge length, number of patches and occupancy

The distribution of species: Edge length, number of patches and occupancy. Fangliang He Department of Renewable Resources University of Alberta. Map agreement / thematic classification accuracy Image restoration Interpreting occurrence using external variables Cluster delineation

emmanuel-hansen
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The distribution of species: Edge length, number of patches and occupancy

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  1. The distribution of species: Edge length, number of patches and occupancy Fangliang He Department of Renewable Resources University of Alberta

  2. Map agreement / thematic classification accuracy • Image restoration • Interpreting occurrence using external variables • Cluster delineation • Estimating species abundance

  3. Three basic landscape metrics • Occupancy, p • Edge length, L • Number of patches, T

  4. Objectives • Developing models to tie the three metrics together • Shedding some light on the question concerning landscape fragmentation, e.g., how much landscape fragmentation is too much?

  5. Edge length-occupancy model (bond percolation model) p 1 - p Probability of black-white join = p(1-p) Total expected # of b-w joins: L = 2J•p•(1-p) where J is the total number of neighboring joins. J = 2JxJy-Jx-Jy, where Jx is the number of cells along x axis He & Hubbell, PRL (2003)

  6. Bond percolation threshold: pc = 0.5

  7. Cluster number-occupancy model (Site percolation model)

  8. Inflexion Not a percolation threshold

  9. Predictions for random distribution

  10. 198 bird distributions in the Czech Republic • Blue area is Czech • Red cells: the distribution of a bird

  11. Bird distributions in the Czech Republic

  12. How much fragmentation is too much? T L

  13. Mechanisms Geometries Conclusions ?

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