Table 2
Density (individuals/m2) of the main families of benthic macroinvertebrates detected at the three mesohabitats of the Roasco Stream before (September 5, 2018) and after (Post01 = October 8, 2018, Post02 = December 3, 2018, Post03 = March 21, 2019, Post04 = July 9, 2019, Post05 = September 12, 2019) the sediment flushing event. The family Leuctridae includes only the genus Leuctra, Perlodidae includes Isoperla and Perlodes, Nemouridae includes Amphinemura, Nemoura and Protonemura, Baetidae includes Baetis, Heptageniidae includes Ecdyonurus, Epeorus, and Rhitrogena.
| Plecoptera | Ephemeroptera | Trichoptera | Diptera | Coleoptera | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mesohabitat | Sample | Leuctridae | Perlodidae | Nemouridae | Baetidae | Heptageniidae | Hydropsychidae | Limnephilidae | Rhyacophilidae | Chironomidae | Empididae | Limoniidae | Simuliidae | Elmidae |
| Pool | Before | 0 | 40 | 10 | 106 | 2 | 14 | 34 | 2 | 46 | 22 | 88 | 16 | 6 |
| Post01 | 0 | 6 | 0 | 2 | 0 | 6 | 4 | 0 | 0 | 0 | 36 | 2 | 4 | |
| Post02 | 2 | 4 | 0 | 42 | 2 | 18 | 346 | 2 | 92 | 0 | 12 | 2 | 2 | |
| Post03 | 118 | 22 | 2 | 130 | 12 | 10 | 332 | 30 | 332 | 2 | 40 | 14 | 0 | |
| Post04 | 0 | 10 | 22 | 18 | 12 | 18 | 6 | 0 | 12 | 0 | 12 | 0 | 0 | |
| Post05 | 0 | 108 | 126 | 510 | 26 | 18 | 6 | 42 | 60 | 70 | 34 | 24 | 14 | |
| Riffle | Before | 0 | 76 | 26 | 450 | 56 | 34 | 8 | 28 | 72 | 2 | 36 | 12 | 30 |
| Post01 | 2 | 10 | 2 | 18 | 2 | 34 | 4 | 30 | 2 | 4 | 10 | 4 | 18 | |
| Post02 | 14 | 0 | 0 | 134 | 8 | 42 | 82 | 52 | 210 | 0 | 4 | 18 | 34 | |
| Post03 | 56 | 6 | 0 | 130 | 6 | 10 | 94 | 70 | 818 | 2 | 22 | 176 | 0 | |
| Post04 | 4 | 8 | 90 | 226 | 8 | 24 | 8 | 16 | 12 | 0 | 14 | 4 | 0 | |
| Post05 | 4 | 52 | 54 | 292 | 4 | 14 | 24 | 36 | 14 | 20 | 4 | 14 | 16 | |
| Step-pool | Before | 0 | 8 | 12 | 360 | 22 | 2 | 0 | 16 | 32 | 0 | 8 | 14 | 6 |
| Post01 | 0 | 0 | 0 | 0 | 0 | 2 | 6 | 2 | 2 | 2 | 0 | 0 | 0 | |
| Post02 | 2 | 2 | 0 | 8 | 2 | 4 | 20 | 0 | 190 | 0 | 2 | 0 | 6 | |
| Post03 | 26 | 16 | 4 | 116 | 8 | 8 | 14 | 36 | 320 | 0 | 20 | 88 | 4 | |
| Post04 | 0 | 0 | 4 | 0 | 10 | 2 | 2 | 2 | 8 | 0 | 14 | 4 | 0 | |
| Post05 | 0 | 26 | 14 | 178 | 8 | 2 | 0 | 8 | 12 | 8 | 12 | 8 | 0 | |
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