| Families | Okpara 1_AVAS | Okpara 1_APAS | Okpara 2_AVAS | Okpara 2_APAS |
| Hydropsychidae | 39 | 0 | 0 | 3 |
| Hydroptilidae | 1 | 0 | 0 | 0 |
| Lepidostomatidae | 3 | 0 | 0 | 0 |
| Leptoceridae | 2 | 0 | 0 | 0 |
| Polycentropodidae | 0 | 0 | 0 | 0 |
| Baetidae | 15 | 7 | 74 | 9 |
| Caenidae | 68 | 23 | 2 | 18 |
| Ephemerellidae | 4 | 0 | 0 | 0 |
| Pleidae | 4 | 0 | 0 | 1 |
| Corixidae | 19 | 1 | 0 | 0 |
| Naucoridae | 4 | 0 | 0 | 5 |
| Mesoveliidae | 1 | 0 | 0 | 0 |
| Veliidae | 1 | 2 | 0 | 2 |
| Dytiscidae | 20 | 8 | 11 | 7 |
| Eubriidae | 0 | 0 | 0 | 1 |
| Elmidae | 0 | 1 | 0 | 0 |
| Gyrinidae | 0 | 1 | 0 | 0 |
| Hydraenidae | 5 | 2 | 0 | 0 |
| Hydrophilidae | 8 | 0 | 3 | 0 |
| Heteroceridae | 0 | 0 | 16 | 0 |
| Scirtidae | 0 | 6 | 0 | 0 |
| Ceratopogonidae | 13 | 6 | 14 | 3 |
| Chironomidae | 76 | 33 | 14 | 20 |
| Culicidae | 0 | 2 | 4 | 0 |
| Simuliidae | 1 | 3 | 6 | 24 |
| Syrphidae | 0 | 0 | 0 | 2 |
| Tabanidae | 3 | 6 | 0 | 2 |
| Thaumaleidae | 0 | 1 | 0 | 0 |
| Tethinidae | 0 | 3 | 0 | 0 |
| Coenagrionidae | 6 | 0 | 0 | 0 |
| Gomphidae | 25 | 1 | 6 | 0 |
| Lestidae | 36 | 0 | 25 | 6 |
| Libelludiae | 309 | 18 | 14 | 61 |
| Platycnemididae | 5 | 0 | 0 | 0 |
| Sialidae | 0 | 2 | 0 | 0 |
| Aphididae | 0 | 3 | 0 | 0 |
| Cercopidae | 0 | 0 | 8 | 0 |
| Cicadellidae | 0 | 0 | 1 | 0 |
| Delphacidae | 0 | 0 | 1 | 0 |
| Ceropidae | 0 | 8 | 0 | 0 |
| Copepodes | 0 | 0 | 9 | 0 |
| Limnaeidae | 65 | 0 | 0 | 0 |
| Neritidae | 0 | 0 | 7 | 0 |
| Physidae | 18 | 0 | 0 | 1 |
| Planorbidae | 0 | 0 | 0 | 2 |
| Glossiphoniidae | 5 | 0 | 0 | 0 |
| Oligochètes | 0 | 36 | 66 | 4 |
| Nemathelmintes | 1 | 3 | 0 | 0 |
| Trombidiformes | 2 | 0 | 0 | 2 |
| Total = 1389 | 759 | 176 | 281 | 173 |
| p-value | 0.003577 | 0.3862 | ||