Ordination and classification of operational geographic units in Southwest Sweden |
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Authors: | Per-Arne Andersson |
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Institution: | (1) Institute of Ecological Botany, Uppsala University, Box 559, S-751 22 Uppsala, Sweden |
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Abstract: | The vascular plant distributions of Dalsland and northern Bohuslän (Southwest Sweden) were subjected to multivariate analyses in order to delimit geographically coherent floristic zones. 271 squares of 5×5 km were the Operational Geographic Units; the data matrix comprises presence/absence species records for each OGU. Different ordination and classification methods were tested and detailed results are presented for detrended correspondence analysis (DCA), UPGMA and ordination space partitioning (OSP). A weighting procedure, neighbour-weighting, which gives pseudo-frequency scores along the nominal scale 0–9 depending on the species' distribution patterns, is introduced. The superior method for delimiting geographically coherent floristic zones was judged to be ordination space partitioning, using DCA and neighbour-weighted species scores.Abbreviations DCA
Detrended Correspondence Analysis
- OGU
Operational Geographical Unit
- OSP
Ordination Space Partitioning
- UPGMA
Unweighted Pair-Group Method using Arithmetic Averages |
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Keywords: | Clustering Detrended correspondence analysis Neighbour-weighting Ordination Space partitioning Phytogeography Vascular plant |
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