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Table 2

Results of the OMI analysis for 17 charophyte communities in Polish lakes identified in more than three surveys in the database (n = 404); communities arranged according to the OMI values in descending order. OMI − Outlying Mean Index; Tol − Tolerance Index; Rtol − residual tolerance. OMI analysis was performed including all hydrophyte communities (n = 65) identified in 692 surveys of Polish lowland lakes; full names and statistics for all other hydrophyte communities are presented in Table S2.

Charophyte community n F (%) Results of the OMI analysis

Inertia OMI Tol Rtol p-value
Nitelletum mucronatae 7 1.7 10.46 8.48 0.99 0.99 0.038
Nitelletum opacae 7 1.7 10.13 6.85 0.94 2.33 0.024
Nitelletum flexilis 37 9.2 7.31 5.31 0.62 1.37 0.024
Charetum filiformis 25 6.2 7.04 5.12 0.45 1.46 0.019
Lychnothamnetum barbati 4 1.0 5.72 4.84 0.01 0.88 0.860
Charetum hispidae 13 3.2 6.30 3.76 1.14 1.39 0.567
Nitelletum gracilis 12 3.0 9.76 3.71 1.94 4.11 0.029
Charetum delicatulae 82 20.3 6.22 3.53 1.05 1.64 0.001
Charetum intermediae 24 5.9 5.73 3.31 0.28 2.15 0.113
Charetum polyacanthae 11 2.7 9.25 2.91 2.22 4.12 0.030
Charetum vulgaris 27 6.7 5.47 2.78 0.66 2.03 0.044
Charetum rudis 43 10.6 6.25 2.65 1.31 2.28 0.007
Charetum fragilis 187 46.3 5.14 2.27 0.95 1.92 0.001
Nitellopsidetum obtusae 303 75.0 6.17 1.42 1.17 3.57 0.001
Charetum contrariae 46 11.4 5.66 1.38 0.62 3.66 0.025
Charetum asperae 53 13.1 6.56 1.30 1.51 3.75 0.026
Charetum tomentosae 199 49.3 5.86 1.18 1.50 3.18 0.001

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