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New similarity indices for the assignment of relevés to the vegetation units of an existing phytosociological classification

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Abstract

Every proposed vegetation classification is sooner or later confronted with an accumulation of new data, which has to be assigned to existing vegetation units. Calculation of similarity indices between new relevés (vegetation plots) and constancy columns of established vegetation units is a suitable method for computerised assignment of relevés to these units. This paper compares several similarity indices using simulated data set where either randomly distributed or diagnostic species prevail in the species composition of the tested relevé. Traditional indices, based only on species composition, produce different results than similarity indices that consider species fidelity. However, both types of indices failed in some situations and thus cannot be widely accepted as suitable methods of additional relevé assignment. Therefore a combined Frequency-Positive Fidelity Index (FPFI) is proposed. This new index includes compositional similarity of an assigned relevé with vegetation unit and retains the advantages and lacks the disadvantages of tested indices. The calculation of all these indices is available in the JUICE program (http://www.sci.muni.cz/botany/juice.htm).

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  1. Department of Botany, Masaryk University, Kotlářská 2, CZ-61137, Brno, Czech Republic

    Lubomír Tichý

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  1. Lubomír Tichý
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Tichý, L. New similarity indices for the assignment of relevés to the vegetation units of an existing phytosociological classification. Plant Ecol 179, 67–72 (2005). https://doi.org/10.1007/s11258-004-5798-8

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  • DOI: https://doi.org/10.1007/s11258-004-5798-8

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