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ScholarsArchive at Oregon State University
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Although nearshore macroinvertebrates are integral members of high
mountain lentic systems, knowledge of ecological factors influencing their
distributions is limited. Factors affecting distributions of nearshore
macroinvertebrates were...
1994-03-02 (iso8601)
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1993-07-19 (iso8601)
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Deforestation and forest fragmentation are the primary threats to the habitat
of endangered lion-tailed macaques, Macaca silenus, in Karnataka, India. Landsat
satellite images of northwest Karnataka, India, from 1977 and 1990 were analyzed.
Two...
1994-02-25 (iso8601)
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Breeding habitat of Harlequin ducks (Histrionicus
histrionicus) was studied in eastern Prince William Sound,
Alaska, during 1991 - 1993. Streams in Prince William
Sound were surveyed for Harlequin ducks and monitored with
mist nets. Physical...
1993-12-09 (iso8601)
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This research focused on features of a genetically
isolated population of cutthroat trout (Oncorhynchus clarki)
in the Triangle Lake basin of coastal Oregon. A falls at
the outlet of Triangle Lake has blocked upstream migration
of trout and...
1993-06-22 (iso8601)
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Hatchery supplementation of anadromous salmon is extensive across the Pacific Northwest region with millions of juvenile salmon stocked annually. The influence of hatchery-origin fish as prey items in recipient ecosystems has been explored, but...
2012 (iso8601)
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Forage availability, diets, distribution, and productivity were
compared for Roosevelt elk, Cervus elaphus roosevelti, using improved
(i.e. seeded, fertilized, and grazed) and untreated areas of the Oregon
Coast Range. Seasonal forage availability...
1993-12-06 (iso8601)
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Availability of suitable nesting habitat that is free of nest predators and provides access to adequate prey resources within commuting distance is a major factor limiting seabird populations. Caspian terns (Hydroprogne caspia) in western North...
2012-11-13 (iso8601)
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Shrews previously recognized as Sorex monticolus were classified
into two species (one with 14 subspecies, the other monotypic) on
the basis of a morphometric analysis of 3610 individuals from
throughout their range. Sorex m. neomexicanus has been...
1994-03-31 (iso8601)
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Visual estimation techniques were used to quantify habitat characteristics,
habitat type (pool, riffle) use and longitudinal distribution of steelhead
(Oncorhynchus mykiss), cutthroat trout (0. clarki), and coho salmon (0. kisutch)
in spring,...
1993-09-07 (iso8601)
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Fishermen's and managers' perceptions of fishery issues are an
important factor to consider when studying conflicts between the
two groups. According to theories of conflict management,
differences in perceptions may cause situations to be...
1993-06-11 (iso8601)
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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...
2012-12-10 (iso8601)
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Habitats for juvenile chinook salmon (Oncorhynchus tshawytscha) were
observed at a high flow during the spring of 1989 and at a low flow during the
spring of 1991 in the lower American River of California. Parameters of
microhabitats in eight...
1992-07-28 (iso8601)
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Headwater riparian areas occupy a large proportion of the land base in Pacific Northwest forests, and thus are ecologically and economically important. Although a primary goal of management along small headwater streams is the protection of...
2012-12-01 (iso8601)
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I compared species composition and relative abundance of'small
mammals and herpetofauna between riparian and upslope habitats among 5
forest types. Riparian- and upslope- associated species were identified
based on capture frequency. Small mammal...
1992-05-01 (iso8601)
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In Oregon, sage grouse (Centrocercus urophasianus) were common in the
eastern portion of the state. Since 1940 populations declined because of
decreased productivity. The western subspecies (C. u. phaios) was listed as a
candidate for threatened...
1992-06-29 (iso8601)
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Detection and treatment of bacterial kidney disease (BKD)
was investigated. Experiments were conducted to evaluate the
quantitative, fluorescent antibody technique (QFAT) that is used
to detect, identify, and quantify both typical and 'bar form'...
1992-12-17 (iso8601)
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Various aspects of the energetic response to handling stress in juvenile
coho salmon (Oncorhynchus kisutch) were examined. Fish were subjected to
four different handling stressors in a Blazka-style respirometer. Stressed fish
had rates of oxygen...
1993-02-16 (iso8601)
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The habitat use, movements, and behavioral energetics
of unsuccessfully breeding female canvasbacks (Aythya
valisineria) were examined during the preflightless period
in southern Manitoba during 1989-90. Following breeding
attempts, unsuccessful...
1993-02-11 (iso8601)
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Nutrition effects productivity of grouse. Females that obtain
high nutrient diets in spring produce larger clutches and larger, more
viable chicks than hens on less nutritious diets. Grouse select high
nutrient foods to help ensure proper...
1992-09-04 (iso8601)
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Differences in primary production and periphyton and macroinvertebrate
biomass between pairs of constrained (valley floor width of less than twice the active
channel width) and unconstrained reaches were investigated in Elk River and four...
1993-08-19 (iso8601)
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The importance of hormone reservoirs in mature teleost eggs is
unknown. To elucidate the effects of hormones on embryonic development,
steelhead trout eggs, Oncorhynchus mykiss, were immersed in either cortisol,
testosterone, or thyroxine at two...
1993-04-12 (iso8601)
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