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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 |