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ScholarsArchive at Oregon State University
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Adult female Dusky Canada Geese were studied on the
Copper River Delta, Alaska and in the Willamette Valley,
Oregon during April through July, 1977 to 1979. Objectives
of the research were to: 1) determine the chronology of use
of protein and...
1984-06-06 (iso8601)
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The endangered western stock of the Steller sea lion (Eumetopias jubatus) - the largest of the eared seals - has declined by 80% from population levels encountered four decades ago. Current overall trends from the Gulf of Alaska to the Aleutian...
2012-01-17 (iso8601)
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The use of passive integrated transponder (PIT) tags in ecological studies is increasingly common, but evaluations of their performance and range of application in the field are still emerging. Here, we compare habitat unit–scale abundance...
2011 (iso8601)
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Recent research conducted throughout the Northern California Current (NCC) on the ecology of Pacific salmon (Oncorhynchus spp.) indicates that variable ocean conditions affect the community composition of zooplankton in the nearshore environment...
2012-05-29 (iso8601)
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Global amphibian declines have been attributed to numerous and often synergistic causes, such as invasive species, pathogens, and ultraviolet-B (UV-B) radiation. The effects of these stressors are context dependent and can vary with location,...
2012-06-08 (iso8601)
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Sardines and anchovies are small pelagic fishes that support important commercial
fisheries around the world. This project reviews the inverse cyclic behavior in the
abundance of these two stocks, which is a striking feature in many regions. In...
2002-06-12 (iso8601)
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The purpose of this study was to investigate the survival and
movements of newly metamorphosed Northern Red-legged frogs (Rana
aurora aurora) as they emigrated from two ephemeral breeding ponds.
Quantifying survival and movement rates will be...
2003-06-17 (iso8601)
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Black rockfish (Sebastes melanops) is an important marine recreational
species throughout the Pacific Northwest. Recent catch data indicate a
trend of age-truncation in the black rockfish population off the Oregon
coast, with older females rapidly...
2003-05-27 (iso8601)
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I investigated the relationship between harlequin duck (Histrionicus
histrionicus) behavior and lack of recovery from the Exxon Valdez oil spill in
Prince William Sound, Alaska. First, I evaluated the hypothesis that harlequin
ducks in winter have...
2004-02-05 (iso8601)
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This study was an investigation of lotic macroinvertebrate distribution in
northeastern Oregon at two different spatial and biological scales. Examination
of assemblages at a limited spatial scale revealed relationships with natural and...
2004-03-12 (iso8601)
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Evaporation ponds that dispose of agricultural drainwater provide attractive
habitat for waterbirds but may result in contaminant exposure that impairs
reproduction. I estimated post-hatching survival and evaluated productivity
estimates for...
2003-04-29 (iso8601)
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Low copy number anonymous nuclear loci were used to search for species
markers in four species of Klamath Basin suckers. We sequenced 28 randomly
chosen loci representing 10,421 bp; 21 loci were similar to sequences in GenBank.
Eight fixed...
2003-11-12 (iso8601)
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Monitoring reproductive success, prey species composition, and colony size of
marine birds has been proposed as a method of assessing changes in marine
systems that are otherwise difficult to sample (Cairns 1987). I measured inter-annual
and...
2004-03-22 (iso8601)
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Collaborative fisheries research provides a mechanism for integrating the unique knowledge, experience, and skills of fishermen and scientists. It is a joint intellectual endeavor that begins with the inception of a project and continues until its...
2011-12 (iso8601)
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Question: Are there general life-history rules for exploitation-caused extinction of mammal populations?
Mathematical methods: A population of size N faced with the added mortality of human exploitation will deterministically go extinct if its...
2011-05 (iso8601)
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Gene expression profiles of tissues and cell-lines can be powerful tools for
documenting the genetic response to a particular treatment, such as stressors.
However, there is a paucity of information on the genetic stress response in the
brain....
2002-12-03 (iso8601)
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Thiamine (vitamin B₁) deficiency is a global concern affecting wildlife, livestock, and humans. In Great Lakes salmonines, thiamine deficiency causes embryo mortality and is an impediment to restoration of native lake trout (Salvelinus namaycush)...
2012-06 (iso8601)
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From 1996 through 1998 I collected mature female black rockfish off Oregon and
examined ovaries and otoliths to estimate weekly, age-specific larval production. In
all reproductive seasons, older black rockfish extruded larvae earlier in the...
2002-05-02 (iso8601)
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Mesoscale physical oceanographic features, such as jets and eddies, can influence the structure of marine ecosystems. We used trophically transmitted parasite communities of pelagic fishes in the northern California Current to examine effects of...
2012 (iso8601)
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The total amount of nitrogen and phosphorus in animal manures, and the proportion of this
amount that becomes available as dissolved inorganic nitrogen and phosphorus within a month
after manures are added to water were examined in the context of...
1992-08-03 (iso8601)
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This thesis examined the influence of fall-spawning coho salmon on the
density, growth rate, body condition, and survival to outmigration of juvenile coho
salmon rearing in beaver ponds on the Copper River Delta, Alaska. During the fall of
1999...
2003-06-13 (iso8601)
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The work presented in this dissertation examines possible
modes of action for growth inhibition by anthropogenic endocrine
disrupting chemicals (EDCs) as well as endogenous hormones
associated with growth in fish. Using the sheepshead minnow...
2002-06-07 (iso8601)
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The Van Dyke's salamander (Plethodon vandyke,) is a rare species endemic to
Washington State. It has been found in cool moist microhabitats along streams, splash zones
of waterfalls, and headwater seeps. We explored the association of the Van...
2003-11-18 (iso8601)
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The dynamic watershed acid-base chemistry model of acidification of groundwater in catchments (MAGIC) was used to calculate target loads (TLs) of atmospheric sulfur and nitrogen deposition expected to be protective of aquatic health in lakes in...
2012-01-31 (iso8601)
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