Abstract
Most of the methods used in the multivariate analysis of data on vegetation and environment, or transformations implied in such methods, put disproportionate emphasis on species with a relatively wide ecological amplitude occurring with relatively high cover-abundance values, and/or rare species. This problem can be overcome to some extent by reducing the cover-abundance values to presence-absence data, but this means a severe loss of information. A standardization of values by species maxima as is done automatically in some programs, may lead to an undesirable emphasis on species represented with low values only.
In this paper a method is presented, by which relatively low cover-abundance values of species are upweighted to an arbitrarily chosen higher value, if these low values are considered to indicate an optimum response of that particular species. The method has been tested on a selection of 40 phytosociological relevés from dune slacks in the Voorne dunes, as well as on the Dune Meadow data set used in the textbook of Jongman et al. (1987). The cluster structure obtained with the optimum-transformation appears to be clearer and the contribution of typical dune slack species to the cluster structure increased significantly. Canonical correspondence analysis of the transformed data gave slightly more important main axes.
Nomenclature
vascular plants: van der Meijden, R., Weeda, E. J., Adema, F. A. B. C. & de Joncheere, G. J. 1983. Flora van Nederland, 20e ed. Groningen; syntaxonomy: Westhoff, V. & den Held, A. J. 1969. Plantengemeenschappen in Nederland. Thieme, Zutphen.
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Abbreviations
- CA:
-
Correspondence Analysis
- CCA:
-
Canonical Correspondence Analysis
- DOL:
-
Detection of Optimality Level
- SWOM:
-
Standardized Weighted Optimality Measure
- WPGMA:
-
Weighted Pair Group Method Average linking clustering.
References
Faith, D. P., Minchin, P. R. & Beibin, L. 1987. Compositional dissimilarity as a robust measure of ecological distance. Vegetatio 69: 57–68.
Hammond, R. & McCullagh, P. S. 1978. Quantitative techniques in geography. Clarendon Press, Oxford.
Jongman, R. H. G., ter Braak, C. J. F. & van Tongeren, O. F. R. 1987. Data analysis in community and landscape ecology. Pudoc, Wageningen.
Klinkhamer, P. G. L. & de Jong, T. J. 1988. The importance of small-scale disturbance for seedling establishment in Cirsium vulgare and Cynoglossum officinale. J. Ecol. 76: 383–392.
Loopstra, I. L. & van der Maarel, E. 1984. Toetsing van de ecologische soortengroepen in de Nederlandse flora aan het systeem van indicatiewaarden volgens Ellenberg. Rapport nr. 381. Rijksinstituut voor onderzoek in de bosen landschapsbouw ‘De Dorschkamp’, Wageningen.
Noest, V. & van der Maarel, E. 1989. A new similarity measure and a new optimality criterion in phytosociological classification. Vegetatio 83: 157–165.
Popma, J., Mucina, L., van Tongeren, O. F. R. & van der Maarel, E. 1983. On the determination of optimal levels in phytosociological classification. Vegetatio 52: 65–76.
ter Braak, C. J. F. 1986. Canonical correspondence analysis: a new eigenvector technique for multivariate direct gradient analysis. Ecology 67: 1167–1179.
ter Braak, C. J. F. 1987. The analysis of vegetation-environment relationships by canonical correspondence analysis. Vegetatio 69: 69–77.
ter Braak, C. J. F. 1988. CANOCO — an extension of DECORANA to analyze species-environment relationships. Vegetatio 75: 159–160.
van der Laan, D. 1979. Spatial and temporal variation in the vegetation of dune slacks in relation to the ground water regime. Vegetatio 39: 43–51.
van der Laan, D. 1985. Changes in the flora and vegetation of the coastal dunes of Voorne (The Netherlands) in relation to environmental changes. Vegetatio 61: 87–95.
van der Maarel, E. 1966. On the vegetational structures, relations and systems, with special reference to the dune grasslands of Voorne (The Netherlands). Thesis University Utrecht.
van der Maarel, E. 1979. Transformation of cover-abundance values in phytosociology and its effects on community similarity. Vegetatio 39: 97–114.
van der Maarel, E., Boot, R., van Dorp, D. & Rijntjes, J. 1985. Vegetation succession on the dunes near Oostvoorne, the Netherlands; a comparison of the vegetation in 1959 and 1980. Vegetatio 58: 137–187.
van der Meijden, R., Weeda, E. J., Adema, F. A. B. C. & de Joncheere, G. J. 1983. Flora van Nederland, 20e ed. Groningen.
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© 1990 Kluwer Academic Publishers
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Noest, V., van der Maarel, E., van der Meulen, F., van der Laan, D. (1990). Optimum-transformation of plant species cover-abundance values. In: Grabherr, G., Mucina, L., Dale, M.B., Ter Braak, C.J.F. (eds) Progress in theoretical vegetation science. Advances in vegetation science, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1934-1_14
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DOI: https://doi.org/10.1007/978-94-009-1934-1_14
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