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Scientific Investigations Report 2006–5101–D

Scientific Investigations Report 2006–5101–D

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Table 10. Number of benthic macroinvertebrate taxa and maximum abundance per insect order or noninsect group, Willamette River basin and surrounding area, Oregon and Washington.

[Abbreviation: m2, square meter]

Insect order/
noninsect group
Number of
unique taxa
Most abundant
Ephemeroptera 13 Baetis tricaudatus 3,082
Plecoptera 10 Zapada cinctipes 4,081
Trichoptera 19 Cheumatopsyche sp. 3,467
Diptera 52 Simulium canadense 12,306
Chironomidae1 37 Cricotopus bicinctus group 3,303
Coleoptera 12 Optioservus sp. 1,349
Lepidoptera 1 Lepidoptera 64
Megaloptera 1 Sialis sp. 40
Odonata 2 Gomphidae 113
Total insects 110
Amphipoda 3 Hyalella azteca 1,401
Oligochaeta 5 Tubificidae 2,129
Mollusca 10 Fluminicola sp. 11,419
Other non-insects 11 Acari 988
Total noninsects 29
Total number of taxa 139

1The Chironomidae value is included in the Order Diptera and is not added for total insects.

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