Sponsor
Portland State University. Department of Biology
First Advisor
Richard Peterson
Date of Publication
1976
Document Type
Thesis
Degree Name
Master of Arts (M.A.) in Biology
Department
Biology
Language
English
Subjects
Algae -- Oregon -- Willamette River -- Growth, Plants -- Effect of light on, Algae -- Growth, Oregon -- Willamette River
DOI
10.15760/etd.2581
Physical Description
1 online resource (50 pages)
Abstract
During the summer of 1974 chemical conditions in the lower reaches of the Willamette River, Oregon were similar to those in other rivers currently experiencing nuisance algal growth problems. Temperature and chemical nutrients are not limiting. Relatively high populations of phytoplankton and productivity values for upstream periphyton beds and surface waters suggest moderately eutrophic conditions. However, with increased depth in the lower river, and a constant euphotic zone, the amount of photosynthetically available light is reduced. With sufficient depth and complete mixing the critical depth is exceeded. Primary productivity rates are subsequently limited by low light availability in the lower river.
Rights
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Persistent Identifier
http://archives.pdx.edu/ds/psu/16303
Recommended Citation
Wille, Stephen Arthur, "Influence of light on algal growth in the lower Willamette River" (1976). Dissertations and Theses. Paper 2584.
https://doi.org/10.15760/etd.2581