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ScholarsArchive at Oregon State University
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Effective and sustainable fisheries management not only depends on identifying and defining stocks (fundamental unit of management), but also on having knowledge of factors influencing the abundance, distribution and connectivity of stocks....
2011-07-14 (iso8601)
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The purpose of this study was to understand the influence of organic material and nutrients from spawning salmon and supplemented salmon carcasses on stream food webs. My study objectives were to examine 1) assimilation of salmon-derived nutrients...
2004-12-15 (iso8601)
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Food habits and levels of organochlorine compounds, lead, and mercury in resident and wintering bald eagles were studied in southcentral Oregon and California, 1979-83. Food habits were assessed by examination of castings from winter communal...
1984-10-15 (iso8601)
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Bycatch, or the incidental capture of non-target species, has been implicated as one of the main factors leading to population declines of many large marine vertebrates, including sea turtles. To effectively manage and conserve these long-lived...
2011-06-16 (iso8601)
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Decline of western sage grouse (Centrocercus urophasianus phaios)
in Oregon may be related to the reduced availability of foods in upland
sagebrush (Artemisia)-grasslands used for brood-rearing. The goal of
this study was to determine primary...
1992-11-13 (iso8601)
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Pacific Coast band-tailed pigeons (Columba fasciata) have declined markedly
during the past several decades. Despite implementation of increasingly restrictive
hunting regulations, populations have shown minimal signs of recovery. I radio-marked...
1988-02-27 (iso8601)
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Diets and foraging strategies of Glaucous-winged Gulls were
studied in areas with and without sea otters in the western Aleutian
Islands, Alaska. Gulls foraged on invertebrates (e.g., sea urchins,
limpets, chitons, mussels, and others) in the...
1982-02-01 (iso8601)
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Juvenile salmonids display highly variable spatial and temporal movement patterns that are influenced by density dependent (e.g., competition, predation) and density independent (e.g., genetics, stream discharge, physical habitat conditions)...
2011-07-25 (iso8601)
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Pacific lamprey, Entosphenus tridentatus, have shown recent and rapid declines in abundance. These anadromous fish return to streams where they mature, spawn and die. It has been inferred that Pacific lamprey enter freshwater and reside for ~ 1...
2011-08-23 (iso8601)
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Genetic diversity of two salmonid species, Dolly Varden (Salvelinus
malma) and coastal cutthroat trout (Oncorhynchus clarki clarki) in Prince William
Sound, Alaska were examined at multiple spatial scales with three molecular
markers. Pleistocene...
2002-06-13 (iso8601)
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An investigation of the genetic and meristic patterns of coastal cutthroat trout
(Oncorhynchus clarki clarki) in two coastal basins, one in Oregon and one in Alaska,
revealed varying degrees of differences among populations within each site....
1996-04-01 (iso8601)
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I examined habitat electivity and movement patterns of adult spring chinook
salmon at microhabitat and channel unit spatial scales, and seasonal to annual temporal
scales in seven streams in the Grande Ronde, John Day, and Imnaha basins. The...
1998-11-30 (iso8601)
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The extensive reduction in adult Pacific lamprey (Entosphenus tridentatus) counts at many hydroelectric dams in the northwestern USA signals a substantial decline in lamprey numbers across the entire region in the past 40 to 50 years. Among the...
2011-11-22 (iso8601)
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Current riparian management objectives in the Pacific Northwest promote both
retention of existing conifers and conversion of hardwood-dominated areas to conifers.
Although understanding of relationships between riparian vegetation and salmonid...
2003-12-19 (iso8601)
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Crosses were made between a stock of summer steelhead (Salmo
gairdneri) known to be resistant to infection by Ceratomyxa
shasta and stocks of summer steelhead known to be susceptible.
Ceratomyxosis, the disease caused by C. shasta was initiated...
1986-08-15 (iso8601)
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This study examined features of deep pool (>0.8 m mean depth) used by
adult summer steelhead in Steamboat Creek (1991-1992). Steamboat Creek had
a heterogenous thermal profile, with some segments exceeding preferred
temperature of steelhead. Deep...
1994-11-14 (iso8601)
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Once historically widespread throughout the Willamette and Umpqua
River drainages, the Willamette Oregon chub is now restricted to
scattered populations along 15 miles of the Middle Fork of the
Willamette River whereas the Umpqua Oregon chub is...
1989-01-17 (iso8601)
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The United States Pacific Northwest is well known for its shellfish farming. Historically, commercial harvests were dominated by the native Olympia oyster, Ostrea lurida, but over-exploitation, habitat degradation, and competition and predation by...
2011-12-06 (iso8601)
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Nine Prairie Falcons (Falco mexicanus) were radio-tagged
in northern California during the spring and summer
of 1976 and 1977 to study foraging behavior. The mean home
range size for 3 males was 227.8 km²; largest portions of
the home range were...
1982-12-10 (iso8601)
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Estuarine residence and growth of juvenile chum salmon
(Oncorhynchus keta) from Netarts Bay, Oregon were estimated
from daily-formed growth increments of sagittal otoliths
which are distinguishable from accretion patterns formed
during freshwater...
1990-02-28 (iso8601)
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The Kittlitz's murrelet (Brachyramphus brevirostris) is a species of conservation concern over the entirety of its known range, which spans coastal Alaska and northeastern Russia. Concerns about the status of the species have been raised due to...
2011-12-05 (iso8601)
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