Two-Step Vegetation Analysis Based on Very Large Data Sets

Two-Step Vegetation Analysis Based on Very Large Data Sets

A two-step method for the classification of very large phytosociological data sets is demonstrated. Stratification of the set is suggested either by area in the case of a large and geographically heterogeneous region, or by vegetation type in the case of a set covering all the plant communities of a...

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Bibliographische Detailangaben
Veröffentlicht in:Vegetatio. - DR W. Junk Publishers, 1948. - 68(1987), 3, Seite 139-143
1. Verfasser: Van der Maarel, Eddy (VerfasserIn)
Weitere Verfasser: Espejel, Ileana, Moreno-Casasola, Patricia
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 1987
Zugriff auf das übergeordnete Werk:Vegetatio
Schlagworte:Classification Composite sample Dune vegetation Large data set Sample stratification Synoptic value Yucatan Information science Biological sciences Religion mehr... Physical sciences Mathematics
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520 |a A two-step method for the classification of very large phytosociological data sets is demonstrated. Stratification of the set is suggested either by area in the case of a large and geographically heterogeneous region, or by vegetation type in the case of a set covering all the plant communities of an area. First, cluster analysis is performed on each subset. The resulting basic clusters are summarized by calculating a 'synoptic cover-abundance value' for each species in each cluster. All basic clusters are then subjected to the same procedure. Second order clusters are interpreted as community types. The synoptic value proposed reflects both frequency and average cover-abundance. It is emphasized that a species should have a high frequency to be used as a diagnostic species. The method is demonstrated with a set of 1138 relevés and 250 species of coastal sand dune vegetation in Yucatan treated with the programs TWINSPAN and TABORD. Some problems and perspectives of the approach are discussed in the light of hierarchy theory and classification theory. 
540 |a Copyright 1987 Dr W. Junk Publishers 
650 4 |a Classification 
650 4 |a Composite sample 
650 4 |a Dune vegetation 
650 4 |a Large data set 
650 4 |a Sample stratification 
650 4 |a Synoptic value 
650 4 |a Yucatan 
650 4 |a Information science  |x Data products  |x Datasets 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Vegetation 
650 4 |a Biological sciences  |x Biology  |x Biological taxonomies  |x Species 
650 4 |a Biological sciences  |x Ecology  |x Population ecology  |x Synecology 
650 4 |a Biological sciences  |x Ecology  |x Aquatic ecology  |x Marine ecology  |x Coastal ecology 
650 4 |a Biological sciences  |x Ecology  |x Population ecology  |x Synecology  |x Biocenosis  |x Plant communities 
650 4 |a Religion  |x Theology  |x Practical theology  |x Religious practices  |x Ordination 
650 4 |a Physical sciences  |x Earth sciences  |x Geology  |x Petrology  |x Sedimentary petrology  |x Sedimentary structures  |x Flow structures  |x Bedforms  |x Dunes 
650 4 |a Information science  |x Information management  |x Information classification 
650 4 |a Mathematics  |x Pure mathematics  |x Algebra  |x Arithmetic mean 
655 4 |a research-article 
700 1 |a Espejel, Ileana  |e verfasserin  |4 aut 
700 1 |a Moreno-Casasola, Patricia  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Vegetatio  |d DR W. Junk Publishers, 1948  |g 68(1987), 3, Seite 139-143  |w (DE-627)601534670  |w (DE-600)2498625-2  |x 00423106  |7 nnns 
773 1 8 |g volume:68  |g year:1987  |g number:3  |g pages:139-143 
856 4 0 |u https://www.jstor.org/stable/20037354  |3 Volltext 
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952 |d 68  |j 1987  |e 3  |h 139-143