Table 2 Composition and mean abundance (individuals/m2) of benthic macroinvertebrates at the four sampling sites during the periods before (BE), during (DU), and after construction (AF). Missing values indicate that no specimens were identified
From: Water quality impacts of small-scale hydromodification in an urban stream in Connecticut, USA
Site A | Site B | Site C | Site D | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Organism | Classification | BE | DU | AF | BE | DU | AF | BE | DU | AF | BE | DU | AF |
Aquatic worm | Oligochaeta d | 6.5 | 3.4 | 0.4 | 7.3 | 6.7 | 0.3 | 13.8 | 0.7 | 0.9 | 9.6 | 1.0 | 0.1 |
Backswimmer | Notonectidae b | 0.4 | |||||||||||
Caddisfly larva | Trichoptera c | 0.6 | 0.3 | 0.4 | 2.8 | 6.2 | 5.9 | 4.0 | 1.2 | ||||
Crane fly larva | Tipulidae b | 0.1 | 0.1 | 0.1 | |||||||||
Crayfish | Astacidea c | 0.3 | 0.1 | 1.0 | 0.1 | 0.7 | 0.3 | 0.1 | 0.1 | ||||
Damselfly larva | Zygoptera c | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.7 | ||||||
Freshwater clam | Veneroida c | 3.7 | 0.3 | 1.2 | 0.3 | ||||||||
Horsehair worm | Nematomorpha e | 0.4 | 0.6 | 0.1 | 0.3 | 2.5 | 5.6 | 2.1 | 0.3 | ||||
Leech | Hirudinea d | 0.6 | |||||||||||
Lunged snail | Fisherola a | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.7 | |||||
Mayfly larva | Ephemeroptera c | 1.9 | 0.4 | 0.1 | 3.0 | 10.4 | 4.4 | 8.0 | 0.9 | 0.1 | 5.5 | 1.5 | 1.3 |
Midge | Nematocera c | 0.1 | 0.9 | 3.0 | 1.2 | 6.2 | 5.0 | 0.1 | |||||
Predaceous diving beetle | Dytiscidae b | 0.1 | 0.6 | 0.1 | 1.0 | 0.1 | 0.1 | 0.1 | |||||
Planarian | Dugesiidae b | 0.1 | 0.1 | 0.1 | 0.1 | ||||||||
Riffle beetle larva | Elmidae b | 0.1 | 0.7 | 1.0 | 0.1 | 1.3 | 0.3 | 0.4 | 0.4 | ||||
Scud | Amphipoda e | 0.4 | 0.7 | 2.7 | 0.7 | 1.3 | 0.7 | 0.4 | 0.3 | 0.1 | 0.4 | ||
Soldier fly larva | Stratiomyidae b | 0.1 | 0.1 | ||||||||||
Sowbug | Isopoda c | 0.1 | |||||||||||
Stonefly larva | Plecoptera c | 0.1 | 0.6 | 0.3 | 0.1 | ||||||||
Water boatman | Corixidae b | 0.1 | 0.1 | ||||||||||
Water bug | Nepomorpha b | 0.1 | |||||||||||
Water flea | Cladocera d | 0.1 | 0.1 | ||||||||||
Water penny beetle | Psephenidae b | 0.1 | 0.6 | 0.3 | 0.3 | 0.1 | 0.1 | ||||||
Water snipe fly larva | Athericidae b | 0.7 | 0.3 | ||||||||||