Table 2
Results of statistical analysis of the differences in leech diversity, expressed by seven indices between groups of sites differed in terms of environmental quality, expressed by the values of BMWPpl and MMI. Analysis is presented as the results of Mann–Whitney test (differences in median values between groups, values of function U and p level are shown) and contingency tables (differences in number of values higher than percentile 0.9 between groups, Chi2 estimation and p level are shown). Results are presented independently for each biocoenotic type.
| Type IV | Type V | Type VI | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comparison | BMWPpl 41–90, N = 62 vs BMWPpl <40, >90, N = 32 | BMWPpl 41–100, N = 61 vs BMWPpl <40, >100, N = 53 | BMWPpl 41–90, N = 30 vs BMWPpl <41, >90, N = 30 | |||||||||
| Result diversity index | U | p< | Chi2 | p< | U | p< | Chi2 | p< | U | p< | Chi2 | p< |
| Shannon | 995 | 0.049 | 5.71 | 0.017 | 1153 | 0.029 | 8.120 | 0.004 | 292 | 0.0462 | 4.140 | 0.042 |
| Evenness | 808 | ns | 1.39 | ns | 1314 | ns | 0.307 | ns | 360 | ns | 0.387 | ns |
| TDI | 710 | 0.012 | 5.71 | 0.017 | 1138 | 0.022 | 4.248 | 0.039 | 287 | ns | 5.554 | 0.025 |
| NRI | 722 | 0.016 | 5.71 | 0.017 | 1112 | 0.017 | 4.930 | 0.026 | 289 | ns | 4.140 | 0.042 |
| MPD | 477 | 10−5 | 8.29 | 0.004 | 1157 | 0.033 | 4.960 | 0.028 | 301 | ns | 4.140 | 0.042 |
| Qent | 638 | 7 × 10−5 | 8.29 | 0.004 | 1181 | 0.041 | 4.248 | 0.039 | 299 | 0.0499 | 4.140 | 0.042 |
| RAO | 784 | 0.021 | 4.84 | 0.019 | 1175 | 0.042 | 4.248 | 0.039 | 306 | ns | 0.387 | ns |
| Type IV | Type V | Type VI | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comparison | MMI 0.3–0.7, N = 66 vs MMI <0.3, >0.7, N = 28 | MMI 0.3–0.8, N = 82 vs MMI <0.3, >0.8, N = 32 | MMI 0.3–0.8, N = 42 vs MMI <0.3, >0.8, N = 18 | |||||||||
| Result diversity index | U | p< | Chi2 | p< | U | p< | Chi2 | p< | U | p< | Chi2 | p< |
| Shannon | 809 | ns | 3.22 | 0.042 | 1221 | 0.033 | 10.11 | 0.001 | 390 | ns | 4.071 | 0.032 |
| Evenness | 829 | ns | 1.01 | ns | 1499 | ns | 1.499 | ns | 407 | ns | 0.532 | ns |
| TDI | 856 | ns | 5.71 | 0.017 | 1182 | 0.041 | 4.977 | 0.026 | 291 | ns | 1.554 | ns |
| NRI | 888 | ns | 1.13 | ns | 1186 | 0.042 | 4.248 | 0.039 | 310 | ns | 4.140 | 0.042 |
| MPD | 500 | 10−5 | 5.78 | 0.016 | 1342 | 0.017 | 3.891 | 0.047 | 409 | ns | 4.140 | 0.042 |
| Qent | 699 | 0.021 | 3.53 | 0.038 | 1419 | 0.032 | 4.977 | 0.026 | 251 | ns | 4.140 | 0.042 |
| RAO | 780 | 0.039 | 3.53 | 0.038 | 1189 | 0.048 | 3.896 | 0.048 | 294 | ns | 1.304 | ns |
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