| Abstract: | During July and August 1978, the U.S. Geological Survey, in cooperation with the Oregon Department of Enviromental Quality, made three intensive river-quality dissolved-oxygen studies in the upper Willamette River basin. Two studies were made on the upper Willamette River and one was made on the Santiam River, a Willamette River tributary. Nitrification, occurring in both the upper Willamette and South Santiam Rivers, accounted for about 62% and 92% of the DO sag in the rivers, respectively. Rates of nitrification were found to be dependent on ammonia concentrations in the rivers. Periphyton and phytoplankton algal samples were collected on the main stem Willamette River and selected tributaries during August 1978. Diatoms were the dominant group in both the periphyton and phytoplankton samples. The most common diatom genera were Melosira, Stephanodiscus, Cymbella, Achnanthes, and Nitzschia. Comparisons with historical data indicate no significant difference from previous years in the total abundance or diversity of the algae. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 10858 |
| Citation Author: | Rinella, F. A.; McKenzie, S. W.; Wille, S. A. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 84 p. :ill., maps ;27 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 81-529 |
| Citation Search Results Text: | Dissolved-oxygen and algal conditions in selected locations of the Willamette River basin, Oregon; 1981; OFR; 81-529; Rinella, F. A.; McKenzie, S. W.; Wille, S. A. |
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| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Dissolved-oxygen and algal conditions in selected locations of the Willamette River basin, Oregon; 1981; OFR; 81-529; Rinella, F. A.; McKenzie, S. W.; Wille, S. A. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1981/0529/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1981/0529/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
