Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table 8. Dominant algal taxon (by cell density) at each site, dominant diatom taxon, and diatom water-quality indicator classification, Willamette River basin and surrounding area, Oregon and Washington.
[Sites are sorted by the urban intensity index (UII). Shading indicates sites with UII greater than 25. Water-quality indicator from Porter (2008). Abbreviations: TN, total nitrogen; DO, dissolved oxygen; SW, southwest; OR, Oregon, WA, Washington; DIN, dissolved inorganic nitrogen. Symbols: >, greater than]
| Site name | UII | Dominant algal taxon | Dominant diatom taxon | ||||
|---|---|---|---|---|---|---|---|
| Division | Scientific name | Scientific name | Diatom water-quality indicator | ||||
| Beaverton Creek near SW 216th Avenue, near Orenco, OR | 100 | Red algae | Unknown Rhodophyte Florideophycidae | Gomphonema kobayasii | Preference for high TN | ||
| Claggett Creek at Keizer, OR | 100 | Red algae | Unknown Rhodophyte Florideophycidae | Gomphonema kobayasii | Preference for high TN | ||
| Fanno Creek at Durham, OR | 96 | Blue-green algae | Leptolyngbya sp. | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Kellogg Creek at Milwaukie, OR | 88 | Blue-green algae | Homoeothrix janthina | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Pringle Creek at Salem, OR | 88 | Blue-green algae | Homoeothrix janthina | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Amazon Creek near Danebo Road, at Eugene, OR | 77 | Blue-green algae | Leptolyngbya sp. | Amphora pediculus | Eutrophic/moderate DO (>75 percent) | ||
| Tryon Creek below Nettle Creek, near Lake Oswego, OR | 72 | Blue-green algae | Homoeothrix janthina | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Curtin Creek near Vancouver, WA | 69 | Blue-green algae | Homoeothrix janthina | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Johnson Creek at Circle Avenue, OR | 59 | Red algae | Unknown Rhodophyte Florideophycidae | Gomphonema kobayasii | Preference for high TN | ||
| Battle Creek near Turner, OR | 58 | Blue-green algae | Leptolyngbya sp. | Preference for high DIN/moderate DO (>75 percent) | |||
| Rock Creek at Quatama Road, near Hillsboro, OR | 51 | Blue-green algae | Phormidium autumnale | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Whipple Creek near Salmon Creek, WA | 49 | Red algae | Unknown Rhodophyte Florideophycidae | Cocconeis placentula var. lineata | Eutrophic/low DO (>50 percent) | ||
| Chicken Creek near Sherwood, OR | 45 | Red algae | Unknown Rhodophyte Florideophycidae | Nupela sp. | Unknown | ||
| North Fork Deep Creek at Barton, OR | 39 | Blue-green algae | Porphyrosiphon martensianus | Achnanthes subhudsonis var. kraeuselii | Unknown | ||
| Oak Creek at Corvallis, OR | 39 | Red algae | Unknown Rhodophyte Florideophycidae | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Tickle Creek near Boring, OR | 32 | Blue-green algae | Homoeothrix janthina | Achnanthes subhudsonis var. kraeuselii | Unknown | ||
| Chehalem Creek at Newberg, OR | 29 | Blue-green algae | Homoeothrix janthina | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Silk Creek near Cottage Grove, OR | 24 | Blue-green algae | Unknown Cyanophyte | Rhoicosphenia abbreviata | Eutrophic/moderate DO (>75 percent) | ||
| Rock Creek near Battleground, WA | 23 | Blue-green algae | Aphanocapsa sp. | Achnanthidium minutissimum | Preference for high DIN/high DO (near 100 percent) | ||
| Salmon Creek near Battleground, WA | 20 | Blue-green algae | Homoeothrix janthina | Achnanthidium sp. 10 | Unknown | ||
| Deep Creek near Sandy, OR | 17 | Diatom | Achnanthes subhudsonis var. kraeuselii | Achnanthes subhudsonis var. kraeuselii | Unknown | ||
| Nate Creek near Colton, OR | 15 | Blue-green algae | Homoeothrix janthina | Achnanthidium sp. 10 | Unknown | ||
| Milk Creek at Camp Adams, OR | 12 | Blue-green algae | Phormidium autumnale | Gomphonema sp. 2 | Unknown | ||
| North Yamhill Creek near Yamhill, OR | 8 | Blue-green algae | Unknown Cyanophyte | Achnanthidium minutissimum | Preference for high DIN/high DO (near 100 percent) | ||
| South Scappose Creek at Scappose, OR | 8 | Blue-green algae | Homoeothrix janthina | Gomphonema kobayasii | Preference for high TN | ||
| Lost Creek near Dexter, OR | 6 | Blue-green algae | Homoeothrix janthina | Gomphonema rhombicum | Unknown | ||
| Iler Creek near Forest Grove, OR | 4 | Blue-green algae | Homoeothrix janthina | Cocconeis placentula var. euglypta | Eutrophic/low DO (>50 percent) | ||
| East Fork Dairy Creek near Meacham Corner, OR | 0 | Blue-green algae | Unknown Cyanophyte | Achnanthes subhudsonis var. kraeuselii | Unknown | ||
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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