Open Access
Table 1
Number of sites classified to four biocoenotic types of watercourses and to five ecological categories on the basis of MMI and BMWPpl indices. Total number of invertebrate families in each type was added.
| Biocoenotic type | Families found | Environmental quality (BMWPpl/MMI) | |||||
|---|---|---|---|---|---|---|---|
| Very good | Good | Moderate | Poor | Bad | Total | ||
| III − Eastern calcareous and siliceous upland streams and rivers | 112 | 34/9 | 54/47 | 45/51 | 15/28 | 6/19 | 154 |
| IV − Lowland sandy streams | 109 | 23/7 | 46/35 | 99/81 | 44/76 | 10/23 | 222 |
| V − Lowland streams and rivers, other than IV and V, and estuarine rivers | 133 | 40/7 | 145/39 | 103/152 | 64/102 | 11/63 | 363 |
| VI − Lowland rivers with organic bottom and lowland rivers connecting lakes | 113 | 22/2 | 43/27 | 41/54 | 13/34 | 6/8 | 125 |
| Total | 170 | 119/25 | 288/148 | 288/338 | 136/240 | 33/113 | 864 |
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