Portland State University. Department of Biology
Richard B. Forbes
Date of Award
Master of Science (M.S.) in Biology
1 online resource (86 p.)
Birds -- Oregon -- Willamette River Valley
Over 115 miles of rock revetments that serve to protect river banks have been constructed in the Willamette Basin. In this study the spring and summer bird use of Willamette Basin revetments is examined. Revetments that had not been recently cleared of most woody vegetation and blackberries were found to have significantly greater total and breeding bird use than cleared revetments. Possible factors affecting bird use, such as vegetation on revetments and vegetation adjacent to revetments are examined using linear regression analysis. The results of this study are compared with results of previous work in riparian forests along the Columbia River. It is concluded that revetments represent significant avian habitat, especially for "edge species," and that present maintenance practices involving removal of vegetation adversely affect bird use.
Perry, Clifford Brian, "Bird use of revetted riverbanks in the Willamette Valley" (1977). Dissertations and Theses. Paper 2858.