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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