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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