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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 32 (1976), S. 65-72 
    ISSN: 1573-5052
    Keywords: Classification ; Data-Processing ; Multivariate analysis ; Numerical phytosociology ; Ordination ; Salt marsh vegetation ; Theoretical phytosociology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Aktivitäten der Arbeitsgruppe für Datenverarbeitung in der Phytosoziologie 1969–1975 werden zusammengefasst und eine Serie von Arbeiten in Vegetatio über die Ergebnisse der verschiedenen numerischen Bearbeitungen, hauptsächlich von Salzwiesen, wird eingeleitet. Es folgt eine Übersicht über sieben Auswahle von Aufnahmen mit welchen gearbeitet wurde. Das Kode-System, dass dem Data-Bank zugrunde liegt wird kurz diskutiert. Fünf Hauptentwicklungslinien in den Aktivitäten der Arbeitsgruppe können unterschieden werden: systematische Datenverarbeitung, Umordnung von pflanzensoziologischen Tabellen, Entwicklung von Klassifikations- und Ordinationsverfahren, numerische Syntaxonomie, und theoretische Phytosoziologie. Der allmähliche Übergang der Gruppe zu einer Arbeitsgruppe für theoretische Phytosoziologie wird angedeutet und ein Symposium über theoretische Pflanzensoziologie angekündigt.
    Notes: Summary The existence of the Working Group for Data-Processing in Phytosociology spans about six years, 1969–1975. ‘Its activities are summarized and a series of papers to appear in Vegetatio, presenting results of various numerical treatments, mainly of salt marsh vegetation, is introduced. A survey is given of seven releve selections to which treatments were applied. Five main fields of activities are discussed: systematical data-processing, rearrangement of phytosociological tables, development of classification and ordination techniques, numerical syntaxonomy, and theoretical phytosociology. The establishment of the Working Group for Theoretical Phytosociology and its first symposium on theoretical aspects is announced.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 40 (1979), S. 49-54 
    ISSN: 1573-5052
    Keywords: Classification ; Concentration ; Data ; Table ; Test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary If the rows and columns of a data table are rearranged in such a way that the non-zero values are concentrated in distinct blocks, the table is said to be structured. In such tables, two specific properties are often subject to interpretations: the sharpness of the block structure and the compositional variation among the blocks. A simple chi square analysis is satisfactory to test the overall sharpness of the block structure. The interpretation of compositional variation is more difficult, since the dimensionality of such variation will almost certainly exceed the dimensionality of the table. A solution can nevertheless be obtained based on a two-step analysis. In the first step, the canonical variates of compositional variation are identified. These are characteristics of the vegetation. In the second step, the environmental variables are identified which are highly correlated with the canonical variates. The example in the paper uses data from fossil flood plains. The data table is structured into 18 blocks of 6 species groups and 3 relevé groups. The chi square test indicates a sharp block structure. The structuring generated two canonical variates. The dominant of these two signifies the environmental influence of changing elevation on the flood plain. The second seems to be a response of the vegetation to disturbance. The algorithm which performs analysis of concentration is AOC. A program is available to enquirers free of charge. The programming language is BASIC.
    Type of Medium: Electronic Resource
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