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Numerical syntaxonomy of the Asplenietalia petrarchae in the Iberian Peninsula
Author(s) -
Escudero Adrián,
Pajarón Santiago
Publication year - 1994
Publication title -
journal of vegetation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 115
eISSN - 1654-1103
pISSN - 1100-9233
DOI - 10.2307/3236153
Subject(s) - partition (number theory) , ordination , peninsula , linear subspace , group (periodic table) , mediterranean climate , mathematics , correspondence analysis , chord (peer to peer) , geography , combinatorics , computer science , geometry , statistics , archaeology , physics , distributed computing , quantum mechanics
. A numerical syntaxonomic study of rupicolous vegetation of the Asplenietalia petrarchae in the Iberian Peninsula is described. The study is based on 37 local tables (OSUs) of different rupicolous communities from limestone cliffs found in the eastern half of the Iberian Peninsula. Three classification approaches were followed: (1) ‘hard partition’ techniques, (2) ‘fuzzy partition’ and (3) ordination partition. In order to find a direct solution, we tried an evaluation system based on the inertia associated with a CCA, Canonical Correspondence Analysis, and its relationships with the inertia of a similar CA, Correspondence Analysis. The most effective solutions were found through spatial partitions, and the best partition was obtained with CA considering five segments per axis. Among the fuzzy partitions the best solution was obtained with two clusters and a fuzziness value of 1.20. The best hierarchical partition was Complete Linkage with Chord Distance as a resemblance function. With the GRID procedure applied to the CA diagram, three different groups were distinguished. The first group is related to the Saxifragion boisseriano‐reuterani, including five OSUs from Baetic ranges; the second group is very close to the Cosentinio‐Lafuenteion rotundifoliae and includes 11 OSUs from thermo‐mediterranean areas; the third group, including 21 OSUs basically related to meso‐mediterranean areas, is strongly related to the Teucrion buxifolii.