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ScholarsArchive at Oregon State University
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We report the incidence of male intersex in adult Pacific lamprey (Entosphenus tridentatus (Richardson, 1836)) during their pre-spawning migration in fresh water. Although “hermaphrodites” have been suggested in other adult lampreys, this is the...
2012-09 (iso8601)
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As in various freshwater and coastal marine ecosystems worldwide, seasonal bottom water hypoxia is a recurring phenomenon in Lake Erie's central basin. While bottom hypoxia can strongly affect sessile benthic animals, its effects on mobile...
2011 (iso8601)
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Redband trout density was examined in three forested streams in central
Oregon at two scales, pool channel unit and microhabitat. Two streams were in
roadless areas and one was in a "highly managed" watershed. At the larger
spatial scale, trout...
1995-10-31 (iso8601)
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The relationship of coastal cutthroat trout (Oncorhynchus clarki clarki) populations
in the Muck Creek basin, a 238 km² southern Puget Sound stream basin in western
Washington, was examined using starch gel electrophoresis and meristic analysis....
1995-10-23 (iso8601)
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This study describes the composition and structure of forests within the immediate
vicinity of Northern spotted owl (Strix occidentalis caurina) nest sites in the Klamath,
Coast, and Cascade provinces of western Oregon and the Olympic province,...
1995-11-07 (iso8601)
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1995-07-26 (iso8601)
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Alternative male phenotypes in salmonine fishes arise from individuals that mature as larger and older anadromous marine-migrants or as smaller and younger freshwater residents. To better understand the processes influencing the expression of...
2011-09-07 (iso8601)
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Sampling error associated with estimates of species composition and age composition
of commercial groundfish landings in Oregon from 1989 to 1991 is documented to evaluate
the impact of variable landing data on fisheries management and monitoring...
1994-12-02 (iso8601)
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Considerable controversy exists about how fish assemblages are
organized. I explicitly took fish movement into account while I
studied the effects of disturbance, habitat complexity, and predation
at different times of the summer to understand the...
1994-05-13 (iso8601)
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1995-12-20 (iso8601)
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Life-history organization of the cutthroat trout (Oncorhvnchus clarki) may be viewed at
various levels, including species, subspecies, metapopulation, population, or individual.
Each level varies in spatial scale and temporal persistence, and...
1994-05-19 (iso8601)
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We describe the migration distances and timing of the adult Pacific lamprey, Entosphenus tridentatus, in the Willamette River Basin (Oregon, U.S.A.). We conducted aerial surveys to track radio-tagged fish upstream of a major waterfall and...
2012-02 (iso8601)
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The environment under which fish are maintained as broodstock before
reproduction is often stressful; however, the impact of stress on broodstock and gamete
quality is not well known. We investigated the effects of stress over the final stages...
1995-10-24 (iso8601)
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No studies have evaluated the effects of limited vehicle access on movements, survival and habitat use of Roosevelt
elk (Cervus elaphus roosevelti) . We installed twenty gates, restricting motorized vehicle access by the public in
seven discrete...
1996-03-07 (iso8601)
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Genetic differences between early and late forms of
Alaskan chinook salmon (Oncorhynchus tshawytscha) were
identified using two genetic approaches: mitochondrial
DNA (mtDNA) analysis and protein electrophoresis. The
study populations consisted of...
1994-02-04 (iso8601)
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