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ScholarsArchive at Oregon State University
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Lampreys (Petromyzontiformes) have persisted over millennia and now suffer a recent decline in abundance. Complex
life histories may have factored in their persistence; anthropogenic perturbations in their demise. The complexity of life
histories...
2013-11 (iso8601)
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Conservation investment in management of at-risk species can be less costly than a delay-and-repair
approach implemented after species receive legal protection. The United States Endangered Species
Act candidate species designation represents an...
2013-11 (iso8601)
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We used serology and muscle
digestion to test black bears (Ursus americanus)
from western Oregon, USA, for Trichinella.
Results indicate black bears in Oregon are not
part of a sylvatic cycle for Trichinella, and risk
of human exposure to...
2014-01 (iso8601)
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We review how urbanization alters aquatic ecosystems,
as well as actions that managers can take to remediate
urban waters. Urbanization affects streams by fundamentally
altering longitudinal and lateral processes that in turn alter
hydrology,...
2014-01-02 (iso8601)
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Climate change is arguably the greatest challenge to conservation of our time. Most
vulnerability assessments rely on past and current species distributions to predict
future persistence but ignore species’ abilities to disperse through...
2014-02 (iso8601)
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Neutral genetic markers are routinely used to define distinct units within species
that warrant discrete management. Human-induced changes to gene flow however
may reduce the power of such an approach. We tested the efficiency of adaptive
versus...
2013-12 (iso8601)
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Past tracking studies of marine animals have primarily targeted adults, biasing our understanding
of at-sea habitat use toward older life stages. Anthropogenic threats persist
throughout the at-sea ranges of all life stages and it is therefore of...
2014-01 (iso8601)
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Understanding local and geographic factors influencing species distributions is a prerequisite for conservation
planning. Our objective in this study was to model local and geographic variability in elevations occupied by native
and nonnative...
2014-01-01 (iso8601)
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Fisheries bycatch threatens populations of marine
megafauna such as marine mammals, turtles, seabirds,
sharks and rays, but fisheries impacts on non-target
populations are often difficult to assess due
to factors such as data limitation, poorly...
2013-12 (iso8601)
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Large river plumes modify coastal environments and can impact production across multiple trophic levels. From 1999 to 2009, the
assemblages of forage fish, predator fish, and other pelagic nekton were monitored in coastal waters associated with...
2014-01 (iso8601)
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Reproductive strategies of birds are shaped by patterns of food supply, yet empirical evidence of
the consequences and mechanisms of food limitation on reproductive performance is inconsistent, probably
due to variable responses from species of...
2013-12 (iso8601)
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Managing weak stocks in mixed-stock fisheries often relies on proxies derived from data-rich indicator stocks,
although there have been limited tests of the appropriateness of such proxies. For example, full cohort reconstruction
of tagged Klamath...
2014-01-01 (iso8601)
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Processes that influence habitat selection in landscapes involve the interaction of habitat composition and configuration
and are particularly important for species with complex life cycles. We assessed the relative influence of landscape spatial...
2013-11-12 (iso8601)
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Chilodontidae is a small family of eight described characiform species popularly
known as headstanders. These small to moderately sized fishes are well known to
aquarists, who prize their striking spotted pigmentation and unusual behaviors, and...
2014-01 (iso8601)
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The role of each habitat fish use is of great importance to the dynamics of populations. During
their early marine residence, Chinook salmon (Oncorhynchus tshawytscha), an anadromous fish
species, mostly inhabit estuaries but also use sandy beach...
2013-12-20 (iso8601)
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An attenuated strain of Flavobacterium psychrophilum (CSF259-93B.17) has shown potential as a vaccine
for prevention of bacterial coldwater disease (BCWD) in rainbow trout, Oncorhynchus mykiss (Walbaum).
Because BCWD outbreaks can result in high...
2013-11 (iso8601)
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We investigated the species identity and local use of cetaceans on the Gilbert
Islands, Republic of Kiribati. Working with the Kiribati Ministry of Environment,
Lands and Agricultural Development and Fisheries Division, we visited
the islands of...
2013-12 (iso8601)
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Bighorn sheep (Ovis canadensis) were not known to live on Tiburón Island, the largest island in the Gulf of California and
Mexico, prior to the surprisingly successful introduction of 20 individuals as a conservation measure in 1975. Today, a...
2014-03-19 (iso8601)
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Connectivity models using empirically-derived
landscape resistance maps can predict potential
linkages among fragmented animal and plant populations.
However, such models have rarely been used to
guide systematic decision-making, such as...
2014-04 (iso8601)
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We reared juvenile Oncorhychus mykiss with low and high standard metabolic rates (SMR) under alternative thermal
regimes to determine how these proximate factors influence life histories in a partially migratory salmonid fish. High SMR...
2014-04 (iso8601)
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The application of DNA-based markers toward the task of discriminating among alternate
salmon runs has evolved in accordance with ongoing genomic developments and
increasingly has enabled resolution of which genetic markers associate with...
2014-06 (iso8601)
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We hypothesized that changes in southeastern Bering Sea foraging conditions for black-legged kittiwakes (Rissa tridactyla)
have caused shifts in habitat use with direct implications for population trends. To test this, we compared at-sea...
2014-03-26 (iso8601)
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The federally threatened northern spotted owl (Strix occidentalis caurina) is the focus of intensive
conservation efforts that have led to much forested land being reserved as habitat for the owl and associated wildlife
species throughout the...
2014-02-24 (iso8601)
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We quantified the relative influence of maternal fidelity to feeding grounds and natal
fidelity to breeding grounds on the population structure of humpback whales Megaptera novae-angliae based on an ocean-wide survey of mitochondrial (mt) DNA...
2013-12-04 (iso8601)
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