Streams across the world are highly fragmented due to the presence of in-stream barriers (e.g., dams and stream-road crossings), many of which restrict or block fish passage. Retrofitting or replacing these structures is a high priority for restoring habitat connectivity for native fishes and other aquatic organisms in the Pacific...
Oregon's watershed councils are local, non-regulatory, collaborative forums charged
with the recovery of endangered salmon and improving water quality under The Oregon Plan for Salmon and Watersheds. Private forest landowners, given their prominence is owning riparian areas, are central to success of these efforts. Using a statewide survey of watershed...
Tuberculosis in salmonoid fishes was first observed in the 1952 run of fall chinook salmon (Oncorhynchus tshawytscha) returning to the Bonneville Hatchery of the Oregon Fish Commission. In the studies reported here, tuberculosis was found not only in adult spring chinook but in silver salmon (0. kisutch), blueback salmon (0....
Water temperature is an important measure of water quality, as well as a dominant factor affecting aquatic life within the stream environment. Elevated water temperatures can decrease the survival rate of fish in each life stage. Cold water species, such as salmonids, are particularly susceptible to elevated water temperatures. For...
The 2003-2005 Biennial Report Volume 2 is an executive summary of Oregon's assessment of the Oregon Coastal Coho Evolutionarily Significant Unit (ESU). The assessment provides a detailed analysis that will inform the pending federal decision on whether to list coho as "threatened" under the Endangered Species Act.
Sections of Volume...
The report summarizes basin level accomplishments and investments related to water quality improvements, fish recovery, and watershed
health. The report also provides an overview of state agency actions
and recommendations to enhance the effectiveness of the Oregon
Plan.
This is the fourth report on the Oregon Plan for Salmon and Watersheds. The first three reports focused on people – their
stories and their efforts to restore watershed health and recover listed fish species. While these earlier reports contained
what little information was available regarding the quantitative aspects of...
The evolution and maintenance of multiple phenotypes within populations is an interesting evolutionary and ecological question, and is becoming increasingly important for the restoration and conservation of partially migratory species. In particular, why individuals adopt a particular phenotype has been the focus of numerous research efforts. In the partially migratory...
Fish assemblage structure was determined along a longitudinal
gradient for three drainages in the upper John Day basin: Middle
Fork, South Fork, and upper Mainstem proper. One or two tributaries
in each drainage were included. Where possible, sites were paired:
those with good versus those with poor riparian habitat. Detrended...
Fluorescent dye was used to assess summer low flow
hydraulic retention and transient storage (dead zone)
associated with fish habitat structures at Camp Creek,
Drift Creek, and the East Fork of Lobster Creek within the
central Coast Range of Oregon. Utilizing channel units to
stratify stream reaches, the effect of...