Data-processing in phytosociology

1. Front Matter

   Pages 1-6

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2. Introduction

   • Eddy Van Der Maarel

   Pages 7-8

3. Data-Processing in Phytosociology: Retrospect and Anticipation

   • Eddy van der Maarel, László Orlóci, Sandro Pignatti

   Pages 9-16

4. TRGRPS—An Interactive Algorithm for Group Recognition with an Example from Spartinetea

   • László Orlóci

   Pages 17-20

5. Deux Applications en Phyto-Écologie de la Notion de Limite ‘Optimale’

   • J. L. Guillerm, B. Gauthier, F. Romane

   Pages 21-31

6. A System for Coding Plant Species for Data-Processing in Phytosociology

   • Sandro Pignatti

   Pages 33-42

7. A Numerical Classification of European Spartina Communities

   • Wil M. Kortekaas, Eddy van der Maarel, Wim G. Beeftink

   Pages 43-52

8. Une Utilisation Possible de L’arbre De Portée Minimale En Phyto-Écologie

   • F. Romane, J. L. Guillerm, G. Waksman

   Pages 53-60

9. On the Resolving Power of Principal Component Analysis in Plant Community Ordination

   • Enrico Feoli

   Pages 61-67

10. A Criterion for Monothetic Classification of Phytosociological Entities on the Basis of Species Ordination

    • Enrico Feoli

    Pages 69-74

11. The Concept of Structure in Phytosociology with References to Classification of Plant Communities

    • M. Rejmánek

    Pages 75-81

12. Delimitation and Ranking of Floristic-Sociological Units on the Basis of Relevé Similarity

    • Robert Neuhäusl

    Pages 83-90

13. Application of Constancy-Species Groups for Numerical Ordering of Phytosociological Tables-The Synoptic Table Version

    • Jaroslav Moravec

    Pages 91-100

14. Ranking Species Based on the Components of Equivocation Information

    • László Orlóci

    Pages 101-103

15. A Phytosociological Survey of the Irish Molinio-Arrhenatheretea Using Computer Techniques

    • J. J. Moore, A. M. O’Sullivan

    Pages 105-109

16. Tabord: A Program for Structuring Phytosociological Tables

    • E. van der Maarel, J. G. M. Janssen, J. M. W. Louppen

    Pages 111-124

17. Automatic Classification of Phytosociological Data on the Basis of Species Groups

    • W. Holzner, M. J. A. Werger, G. A. Ellenbroek

    Pages 125-132

18. Transformation of Cover-Abundance Values in Phytosociology and its Effects on Community Similarity

    • E. van der Maarel

    Pages 133-150

19. Relevé Ranking Based on a Sum of Squares Criterion

    • Enrico Feoli, Laura Feoli Chiapella

    Pages 151-153

20. Hierarchical Classification of European Salt Marsh Vegetation Based on Numerical Methods

    • Duilio Lausi, Enrico Feoli

    Pages 155-168

(RANKIN) of equivocation information (1-:) and interaction information (M). The method is described in the present paper for I: and in a previous paper (Orloci, 1976) for M. The results presented in this paper suggest that for Species Rank order Information Percentage of total* species to be weighted according to their suitability to I· M I M r M characterize isolated groups of releves in a phytosociolo­ 5 7 54.15 2.31 17.97 0.82 gical table, the equivocation information may serve as a 9 5 49.86 23.19 16.55 8.22 3 3 9 47.79 0.56 15.86 0.20 suitable weight. The appropriate formulations are derived 6 4 8 36.18 1.18 12.01 0.42 4 5 3 24.36 59.34 8.09 21.03 and computed for some data from a salt marsh community. 8 6 4 24.25 39.04 8.05 13.84 10 7 I 21.96 71.17 7.29 25.23 7 8 2 18.67 69.01 6.20 24.46 9 10 18.40 6.11 10 6 5.64 16.31 1.87 5.78 References Total 301.00* 282.11 * 100.00 100.00 Feoli, E. 1973. An index for weighing characters in monothetic classifications. (Italian with English summary). Giorn. Bot. Ita!' 107: 263-268. Gower, J.e. 1967. A comparison of some methods of cluster is a monotone, increasing function of sample size if .. ).

• Ordination
• classification
• ecology
• plant
• vegetation

• Division of Geobotany, University of Nijmegen, Nijmegen, The Netherlands

  Eddy Maarel

• Department of Plant Sciences, University of Western Ontario, London, Canada

  László Orlóci

• Istituto ed Orto Botanico, Trieste, Italy

  Sandro Pignatti

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