Abstract
Relevés of Isoetid vegetation from 60 lakes in southern Sweden have been classified with the help on numerical methods. A community system is constructed, at the variant level by clustering with the TABORD program, and at the community and subcommunity levels by reference to traditional floristic characteristics. The diagnostic species were selected with the help of PCA. Isoëtes lacustris, Lobelia dortmanna and Littorella uniflora determined the community composition together with Eleocharis acicularis. The differentation of the syntaxa along the first three ordination axes of a PCA was clear. The complex water depth factor determines clearly the position of the small syntaxa (variants) in the PCA ordination space. At high levels of similarity the relevés were grouped effectively with the TABORD program, so that the clusters are floristically homogeneous and easy to identify on the basis of floristicsociological criteria. At higher syntaxon levels a selective use of diagnostic species was made.
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Mäkirinta, U. Classification of South Swedish Isoetid vegetation with the help of numerical methods. Vegetatio 81, 145–157 (1989). https://doi.org/10.1007/BF00045520
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DOI: https://doi.org/10.1007/BF00045520