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Willamette River At Crystal Lake

Macroinvertebrate data: 08-23-2016



School: Avery House Nature Center

Date and time: Aug. 23, 2016, 9:30 a.m.

Water quality: Excellent

Number of people sorting/identifying: 18

Water type: pool

Time spent sorting/identifying: 30 minutes

Weather:

Percent EPT: 17.24%

Note: EPT is the total number of caddisflies, mayflies, and stoneflies found divided by number of all bugs

Field notes: Riffle Beetles - none; but 2 predacious diving beetles and 34 waterboatmen

Sensitivity to pollution
Sensitive
Count
Caddisfly
0
Mayfly
7
Riffle beetle
0
Stonefly
8
Water penny
0
Dobsonfly
4
Sensitive total
9
Somewhat Sensitive
Count
Clam/mussel
1
Crane fly
0
Crayfish
0
Damselfly
18
Dragonfly
0
Scud
12
Fishfly
0
Alderfly
2
Mite
1
Somewhat sensitive total
10
Tolerant
Count
Aquatic worm
5
Blackfly
0
Leech
0
Midge
4
Snail
17
Mosquito larva
8
Tolerant total
4