Ordination of the analysed lakes Sample Clauses

Ordination of the analysed lakes. The list of taxa identified in all 28 lakes included 127 taxa; 115 recorded at species level, 11 at genus level and one undefined xxxx. The list was comprised of 81 submerged taxa (including 4 algae, 6 mosses, 8 isoetids and 13 charids) and 46 others (including helophytes, supralittoral and even 4 terrestrial taxa). Filamentous algae, woody species (Alnus sp., Salix sp., etc.) and taxa recorded at genus or higher level were excluded from analyses. The clustering of species data including helophytes per lake is shown for the abundance data on species composition only, as results from the presence absence were very comparable. Figure 3.1 shows the similarity between samples in a dendrogram graph and Figure 3.2 shows the resulting ordination of sites in a 2D plot (stress 0.16). Three main groups of samples can be distinguished in the similarity analyses: 1 mainly higher alkalinity central European lakes (FR, EE, PL, DE, GE), with 2 more eutrophic, moderate alkaline lakes from the Northern GIG (1 UK, 1 FI),