Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table 11. Commonly observed benthic macroinvertebrate taxa and tolerance values, Willamette River basin and surrounding area, Oregon and Washington.
[Taxa sorted in order of decreasing frequency of occurrence. Insect order and noninsect group: Taxa occurs in more than 50 percent of streams. Abbreviation: PNW, Pacific Northwest]
| Insect order and noninsect group |
Taxa | Number of streams |
Percent of sites |
PNW tolerance value |
|---|---|---|---|---|
| Noninsect (water mite) | Acari | 27 | 96 | 6 |
| Diptera | Simulium canadense | 27 | 96 | 6 |
| Noninsect (snail) | Juga sp. | 25 | 89 | 7 |
| Ephemeroptera | Baetis tricaudatus | 23 | 82 | 7 |
| Noninsect (worm) | Dero sp. | 22 | 79 | 10 |
| Noninsect (worm) | Lumbriculidae | 20 | 71 | 8 |
| Trichoptera | Cheumatopsyche sp. | 19 | 68 | 8 |
| Ephemeroptera | Paraleptophlebia sp. | 19 | 68 | 5 |
| Diptera (Chironomidae) | Polypedilum sp. | 19 | 68 | 6 |
| Diptera (Chironomidae) | Thienemannimyia groupsp. | 17 | 61 | 6 |
| Diptera (Chironomidae) | Rheotanytarsus sp. | 16 | 57 | 6 |
| Diptera (Chironomidae) | Eukiefferiella sp. | 16 | 57 | 8 |
| Diptera (Chironomidae) | Cricotopus bicinctus group | 16 | 57 | 7 |
| Coleoptera | Optioservus sp. | 16 | 57 | 9 |
| Coleoptera | Zapada cinctipes | 16 | 57 | 4 |
| Noninsect (snail) | Ferrissia sp. | 16 | 57 | 7 |
| Noninsect (amphipod) | Crangonyx sp. | 15 | 54 | 8 |
| Noninsect (worm) | Tubificidae | 15 | 54 | 10 |
| Noninsect (crayfish) | Pacifastacus leniusculus | 15 | 54 | 7 |
| Noninsect (snail) | Fluminicola sp. | 15 | 54 | 7 |
| Ephemeroptera | Rhithrogena sp. | 15 | 54 | 3 |
| Trichoptera | Ceratopsyche cockerelli | 14 | 50 | 5 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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