Table 2.
Presence and absence of benthic macroinvertebrates along sites S1 to S5
| Groups | S1 | S2 | S3 | S4 | S5 |
|---|---|---|---|---|---|
| Hirudinea (Annelida) | |||||
| Erpobdellidae | 3 | 3 | 6 | 11 | 2 |
| Glossiphonidae | 2 | 3 | |||
| Oligochaeta (Annelida) | |||||
| Lumbricidae | 9 | 3 | 2 | 19 | 1 |
| Lumbriculidae | 69 | 2 | 167 | 14 | 22 |
| Tubificidae | 171 | 231 | 325 | 31 | 176 |
| Crustacea (Arthropoda) | |||||
| Gammaridae | 4 | 4 | 20 | 104 | 86 |
| Asselidae | 4 | 4 | 26 | 3 | 1 |
| Trichoptera (Arthropoda) | |||||
| Rhyacophilidae | 4 | 7 | 4 | 5 | 5 |
| Hydropsychidae | 5 | 8 | 7 | 10 | 7 |
| Polycentropodidae | 4 | 2 | |||
| Limnephilidae | 1 | 26 | 3 | 14 | |
| Psychomiyiidae | 3 | 1 | |||
| Hydroptilidae | 2 | ||||
| Coleoptera (Arthropoda) | |||||
| Haliplidae | 1 | ||||
| Dytiscidae | 3 | 3 | |||
| Hydrophilidae | 1 | ||||
| Ephemeroptera (Arthropoda) | |||||
| Baetidae | 111 | 239 | 217 | 200 | 71 |
| Ephemerellidae | 18 | 19 | 3 | 1 | |
| Heptageniidae | 125 | 51 | 22 | 14 | 10 |
| Leptophlebiidae | 1 | 4 | |||
| Caeniidae | 1 | ||||
| Plecoptera (Arthropoda) | |||||
| Perlodidae | 21 | 5 | |||
| Nemouridae | 11 | ||||
| Leuctridae | 14 | 13 | |||
| Diptera (Arthropoda) | |||||
| Chironomidae | 155 | 173 | 77 | 120 | 107 |
| Simulidae | 81 | 32 | 1 | 1 | 0 |
| Tipulidae | 40 | 29 | 21 | 21 | 14 |
| Paediciidae | 22 | 20 | 6 | ||
| Mollusca | |||||
| Sphaeridae | 1 | ||||
| Viviparidae | 2 | ||||
| Physidae | 2 | 1 | |||
| Lymnaeidae | 2 | ||||
| Total number of organisms | 877 | 878 | 914 | 581 | 503 |
| Density (organisms/miles2) | 166 | 111 | 54 | 30 | 26 |