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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     
  1. aGenus
  2. bFamily
  3. cOrder (including infra-, sub-)
  4. dClass (including sub-)
  5. ePhylum