Presentation from Third InDOG Doctoral Conference in Olomouc, Czech Republic. 13. - 16. October 2014

1. Methods for description of distribution
of species obtained by quadrant mapping
Zbyněk Janoška
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2. Quadrant mapping
 Kartierung der Flora Mitteleuropas (KFME), Niklfeld,
1971
 Environmental mapping (biological)
 CZ, SK, A, RO
 Base level:
 10 minutes longitude
 6 minutes latitude
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3. Data
 Lepidoptera – daily butterflies
 White Carpathians area (715 km2)
 Data collection: 2004-05; 124 species; 20 000
records
 Incidence of species – T/F values
 Locations checked multiple times (5-20)
 Bias in data collection (towards accesible and
enviromentaly rich locations)
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4. Data
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5. Data
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6. Data
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7. Data
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8. Data
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9. Aim of study
 Propose descriptors of distribution
 Clustering / regularity / randomness
 Density
 Dominance
 Patches – continuously inhabited areas (Rook
neighborhood)
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10. Descriptors of shape
 Moran's Index (Moran, 1950)
 Bias – not suitable
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11. Dominance
 DI1 = Size of largest patch / Size of second largest
patch
 DI2 = Size of largest patch / Size of inhabited area
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12. Dominance
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13. Density
 Typicaly: Occupied area / Total area
 In this case: total area same for all species
 Modification: Occupied area / Homerange
 Homerange = Minimal Convex Polygon
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14. Coverage
 Percentage of patches needed to cover X % of area
Number of patches
 (Self-explanatory)
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15. Results
 Descriptors partially correlated
 Suitable for comparisson of pairs of distribution
 Given data quality, should be used with caution
 All calculations can be automatized → data mining
tool
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16. Further analysis
 Transformation, standardization, outlier detection
 Dimension reduction (PCA, Correspondence
Analysis)
 Clustering of data
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17. Literature
 MORAN, P. A. P. (1950). Notes on Continuous
Stochastic Phenomena. Biometrika 37(1) 17-23.
 NIKLFELD, H. (1971). Bericht über die Kartierung der
Flora Mitteleuropas. Taxon 20(4) 545-571
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