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ScholarsArchive at Oregon State University
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2002-03-13 (iso8601)
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Lingcod are an overexploited fish species in the Pacific Northwest and although there
has been extensive study of the habitat requirements of adults, particularly during
spawning, relatively little is known regarding the habitat requirements of...
2005-05-23 (iso8601)
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Although widely studied in many portions of North America, little is known
about the specific habitat requirements of mallard ducks (Anas platyrhynchos) during
the breeding season in western Oregon. I radio-marked 72 female mallards in the...
2001-07-23 (iso8601)
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One of the greatest threats to native bull trout Salvelinus confluentus populations
is the presence of non-native brook trout S. fontinalis. This study, conducted in two
second-order Eastern Oregon streams, investigates the effect of brook trout...
2000-10-31 (iso8601)
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The extent of biological invasions, their role on the feeding of
native fishes and their impact on community stability were
investigated in Alsea Bay and Yaquina Bay, two estuaries on the
central Oregon coast, USA. Most nonindigenous species...
2000-07-14 (iso8601)
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Avian movement behavior provides insight on patterns of regional and local
fidelity, habitat and resource requirements, the scale at which individuals perceive
the landscape, and the relative influence of the spatial array of resources.
Shorebirds...
2001-07-19 (iso8601)
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The purpose of this study was to investigate the primary factors
affecting colony size, reproductive success, and foraging patterns of
Double-crested Cormorants (Phalacrocorax auritus albociliatus) nesting at
East Sand Island in the Columbia River...
2002-10-21 (iso8601)
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The California brown pelican (Pelecanus occidentalis californicus) is listed as an
endangered species under the U.S. Endangered Species Act. The Recovery Plan for
this subspecies outlines the need to "Assure long-term protection of adequate food...
2004-09-15 (iso8601)
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Understanding food webs is fundamental in conserving endangered species and maintaining healthy ecosystem function, particularly in desert spring systems. We identified dominant energy sources in the Muddy River Warm Springs area, Clark County,...
2011-03-08 (iso8601)
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Because human land use activities often result in increased fragmentation of
headwater stream habitats, a better understanding of the effects of fragmentation on
the genetic heterogeneity of stream salmonids is useful for effective management.
We...
2003-12-17 (iso8601)
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I conducted acoustic lure surveys of northern pygmy-owls (Glaucidium gnoma) on
transects that were systematically placed in forested areas throughout the state of Oregon.
My objectives were to determine if pygmy-owls were associated with...
1999-05-21 (iso8601)
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The Pseudophyllidean tapeworm, Schistocephalus solidus, is a parasite that
requires both copepods and fish, mainly the threespine stickleback (Gasterosteus
aculeatus) as intermediate hosts, and birds as its final host to complete its life cycle....
2004-04-19 (iso8601)
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Despite the belief that fuels management, a form of prescribed fire that reduces
accumulated fuels in commercially thinned forests, is necessary to restore forest 'health'
in the Pacific Northwest, its effects on wildlife has received little...
2002-09-13 (iso8601)
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Redband trout (Oncorhynchus mykiss gairdneri) are found over a wide
range of environmental conditions and are known for their variability in life history
traits among watersheds or even within streams. Life history traits and population
structure...
2000-06-01 (iso8601)
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Sympatric steelhead and resident rainbow trout (Oncorhynchus mykiss) are known
to exist in many rivers throughout the Pacific Rim. Whether sympatric steelhead and
resident rainbow trout are polymorphisms within a single gene pool or two...
2000-05-05 (iso8601)
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The coexistence of multiple predators may have important consequences for
the structure and function of communities. Interactions between predators may
strongly affect their combined direct and indirect effects on prey populations and
lower...
2002-07-08 (iso8601)
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2005-11-29 (iso8601)
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Forest managers are challenged to provide timber revenues and other resources
for society while protecting and enhancing components of biodiversity that are often
associated with older forests or older forest structure, such as dead wood. We...
2005-02-15 (iso8601)
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Small remnants of 'natural' habitats exist today throughout much of the world. Upland
prairies in the Willamette Valley, Oregon have been nearly eliminated by conversion to
agriculture and other uses. As a result, very few prairies remain and at...
2002-11-01 (iso8601)
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Channels that were scoured to bedrock by debris flows provided unique
opportunities to calculate the rate of sediment and wood accumulation, to make
inferences about processes associated with input and transport of sediment, and to gain
insight...
2001-11-13 (iso8601)
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