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ScholarsArchive at Oregon State University
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Marine provinces, founded on contrasting floras or faunas, have been recognized for more than 150 years but were not consistently defined by endemism until 1974. At that time, provinces were based on at least a 10% endemism and nested within...
2012-01 (iso8601)
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The ecology of female mallards (Anas platyrhynchos) and their
broods was studied during 1988-90 on Lower Klamath National Wildlife
Refuge, California. Survival of 127 radio-marked ducklings from 64
broods was 0.18 to 10 days of life, and 0.37 and...
1991-12-09 (iso8601)
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Cyphocharax biocellatus, a species of curimatid characiform apparently endemic to the Marowijne River/Fleuve Maroni system in Suriname and French Guiana, and the Maim River basin in French Guiana is described as new. The new species is diagnosed...
2012-03-31 (iso8601)
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Rainbow trout were exposed to aluminum at pH 7.25 and
8.25 and four hardnesses (10, 30, 80, and 120 ppm CaCO₃)
for 96 hours in a continuous-flow system and mortality and
aluminum accumulation in the gills were determined.
Temperature, pH, and...
1992-01-14 (iso8601)
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Feral goat (Capra hircus) populations adversely impact
native insular biota and physical habitats worldwide. The
effectiveness of the Judas goat technique for eradicating
remnant feral goats was studied on San Clemente Island
(SCI), California...
1991-12-09 (iso8601)
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As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might...
2012-12-19 (iso8601)
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North American freshwater mussels have been subjected to multiple stressors in recent decades that have contributed to declines in the status and distribution of many species. However, considerable uncertainty exists regarding the relative...
2013-02 (iso8601)
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Native bees are important ecologically and economically because their role as pollinators fulfills a vital ecosystem service. Pollinators are declining due to various factors, including habitat degradation and destruction. Grasslands, an important...
2012-09-06 (iso8601)
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Being able to individually follow fish <40 mm in length is a challenge for fish research. In the present study we examined whether the use of visible implant elastomer (VIE) tags is suitable for research on first-feeding rainbow trout Oncorhynchus...
2012-07-20 (iso8601)
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I investigated the population attributes and habitat
selection of mountain beaver (Aplodontia rufa) recolonizing
clearcuts in the Coast Range mountains of Polk and Lincoln
counties, Oregon between June 1989 and August 1990. The
population...
1991-08-12 (iso8601)
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This study was designed to provide information about the juvenile life history of
coho salmon, Oncorhynchus kisutch, in the Tenmile Lakes in Oregon by 1) classifying
scales of spawning fish and outgoing smolts (1+), 2) assessing the contribution...
1992-03-16 (iso8601)
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Fifty-six species or approximately 20% of the Neotropical characiform superfamily Anostomoidea (families
Anostomidae, Chilodontidae, Curimatidae and Prochilodontidae) occur in the freshwaters of French Guiana, Guyana,
and Suriname although these...
2012-03-31 (iso8601)
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This investigation explored the use of microcosms as a tool for
studying the dynamics of tropical aquaculture ponds. The potential use
of rabbit excreta as a pond fertilizer in integrated farming systems was
also investigated.
Twelve insulated...
1991-09-27 (iso8601)
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The energy ratio mapping algorithm (ERMA) was developed to improve the performance of
energy-based detection of odontocete echolocation clicks, especially for application in environments
with limited computational power and energy such as acoustic...
2011-04 (iso8601)
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Sexual maturation and sex differentiation comprise facets of a
common theme: reproduction. The endocrine system regulates many
of the critical physiological processes necessary for reproduction and
offers a framework within which technologies can...
1990-05-29 (iso8601)
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It is critical to study factors that are important for origin and maintenance of biological
diversity. A comparative approach involving a large number of populations is
particularly useful.We use this approach to study the relationship between...
2012-06 (iso8601)
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In higher vertebrates, normal digestion and absorption by the
gastrointestinal tract are dependent on the orderly and controlled
transit of intraluminal contents. A relationship between fluid
passage through the gut and absorption from the gut has...
1981-06-15 (iso8601)
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The genotype frequencies of one-year-old oyster spat
(Crassostrea gigas) from parents of known genotype, are compared
to the frequencies expected with Mendelian inheritance. The genotypes
are characterized at three enzyme loci, Aspartate...
1976-07-30 (iso8601)
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Once hunted to the brink of extinction, humpback whales (Megaptera novaeangliae) in the North Atlantic have recently been increasing in numbers. However, uncertain information on past abundance makes it difficult to assess the extent of the...
2012-12-13 (iso8601)
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Experiments were carried out in fall and winter, 1990
and spring and summer, 1991 , to determine growth and
mortality of juvenile Pacific oysters {Crassostrea gigas)
in effluent from cultured coho salmon {Oncorhynchus
kisutch) , and effluent from...
1992-03-03 (iso8601)
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Eight scale characters of known hatchery and wild coho salmon
(Oncorhynchus kisutch) were compared, and a linear discriminant
function was used to determine if hatchery and wild adult coho
salmon could be correctly identified by their scales....
1978-08-04 (iso8601)
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A study was conducted at Yaquina Bay, Oregon, to determine
the age-fecundity relationships in the striped seaperch Embiotoca
lateralis. A questionnaire was sent to California, Oregon, and
Washington to ascertain what regulations were in effect,...
1965-07-27 (iso8601)
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Studies were conducted during late winter and spring of 1970 to
establish the extent of spawning of Pacific herring (Clupea harengus
pallasi Valenciennes) in the Yaquina estuary, and to define the degree
of egg mortality on certain substrates....
1971-09-02 (iso8601)
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