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Janoska - Methods for Description of Distribution of Species Obtained by Quadrant Mapping
1. Methods for description of distribution
of species obtained by quadrant mapping
Zbyněk Janoška
www.geoinformatics.upol.cz
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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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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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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