Janoska - Methods for Description of Distribution of Species Obtained by Quadrant Mapping
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Transcript of Janoska - Methods for Description of Distribution of Species Obtained by Quadrant Mapping
www.geoinformatics.upol.cz
Methods for description of distribution of species obtained by quadrant mapping
Zbyněk Janoška
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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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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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Data
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Data
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Data
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Data
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Data
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Aim of study
Propose descriptors of distribution Clustering / regularity / randomness Density Dominance
Patches – continuously inhabited areas (Rook neighborhood)
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Descriptors of shape
Moran's Index (Moran, 1950) Bias – not suitable
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Dominance
DI1 = Size of largest patch / Size of second largest patch DI2 = Size of largest patch / Size of inhabited area
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Dominance
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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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Coverage
Percentage of patches needed to cover X % of area
Number of patches
(Self-explanatory)
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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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Further analysis
Transformation, standardization, outlier detection Dimension reduction (PCA, Correspondence Analysis) Clustering of data
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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