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Hesthavn Nature Center
Macroinvertebrate data: 08-15-2011
School: Oregon State University
Date and time: Aug. 15, 2011, 7:43 a.m.
Water quality: Excellent
Number of people sorting/identifying: 5
Water type: riffle
Time spent sorting/identifying: 40 minutes
Weather:
Percent EPT: 36.67%
Note: EPT is the total number of caddisflies, mayflies, and stoneflies found divided by number of all bugs
Field notes: 77 degree sunny day, samples collected at base of first set of stairs thought we might have discovered an invasive crayfish species from the Great Lakes but found, after consult with OSU staff, the crayfish was a native above in the chart we substituted gilled snails for the water penny since they were not lung snails
Sensitivity to pollution
Sensitive
Count | |
---|---|
Caddisfly |
1 |
Mayfly |
2 |
Riffle beetle |
0 |
Stonefly |
8 |
Water penny |
8 |
Dobsonfly |
0 |
Sensitive total |
12 |
Somewhat Sensitive
Count | |
---|---|
Clam/mussel
|
0 |
Crane fly
|
0 |
Crayfish
|
2 |
Damselfly
|
0 |
Dragonfly
|
1 |
Scud
|
1 |
Fishfly
|
0 |
Alderfly
|
0 |
Mite
|
0 |
Somewhat sensitive total |
6 |
Tolerant
Count | |
---|---|
Aquatic worm
|
5 |
Blackfly
|
2 |
Leech
|
0 |
Midge
|
0 |
Snail
|
0 |
Mosquito larva
|
0 |
Tolerant total |
2 |