Advisor

Richard Peterson

Date of Award

1976

Document Type

Thesis

Degree Name

Master of Arts (M.A.) in Biology

Department

Biology

Physical Description

1 online resource (50 pages)

Subjects

Algae -- Oregon -- Willamette River -- Growth, Plants -- Effect of light on, Algae -- Growth, Oregon -- Willamette River

DOI

10.15760/etd.2581

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.

Persistent Identifier

http://archives.pdx.edu/ds/psu/16303

Included in

Biology Commons

Share

COinS