The Bering Sea ecosystem has experienced significant climatic and biological shifts
over the past 3 decades, including temporal and spatial fluctuations of jellyfish biomass. Jellyfish
are important predators and competitors of fish; thus, it is critical to understand the effects of environmental
factors on their population dynamics. We explored the...
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these sys-
tems (e.g. Purcell & Decker 2005, Møller & Riisgård
2007, Brodeur et al. 2008b, 2011
The Bering Sea ecosystem has experienced significant climatic and biological shifts
over the past 3 decades, including temporal and spatial fluctuations of jellyfish biomass. Jellyfish
are important predators and competitors of fish; thus, it is critical to understand the effects of environmental
factors on their population dynamics. We explored the...
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environmental factors via nonlinear time series models
MaryBeth Decker1,*, Hai Liu2, Lorenzo Ciannelli3
The Bering Sea ecosystem has experienced significant climatic and biological shifts
over the past 3 decades, including temporal and spatial fluctuations of jellyfish biomass. Jellyfish
are important predators and competitors of fish; thus, it is critical to understand the effects of environmental
factors on their population dynamics. We explored the...
The Weather Radar Set An/CPS-9 at McCulloch Peak,
Oregon, provided data of changes in radar precipitation
echo patterns in the vicinity of Marys Peak. Echo heights
studied from data collected on 14 March 1963 averaged nearly
the same upwind, directly over Marys Peak, and downwind.
For the data of 28...
For many organisms, the reconstruction of source-sink dynamics is hampered by limited knowledge of the spatial
assemblage of either the source or sink components or lack of information on the strength of the linkage for any source-sink
pair. In the case of marine species with a pelagic dispersal phase, these...
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Phase
Kun Chen1, Lorenzo Ciannelli2, MaryBeth Decker3, Carol Ladd4, Wei Cheng4,5, Ziqian Zhou6,
Kung
Fishery management production models tend to stress only the elements directly linked to fish (i.e. fish, fish food, and fish predators). Large coastal jellyfish are major consumers of plankton in heavily fished ecosystems; yet, they are frequently not included as model components. We explore the relationship between gulf menhaden (Brevoortia...
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ecosystem
Kelly L. Robinson1‡*, James J. Ruzicka2, Frank J. Hernandez3, WilliamM. Graham1, MaryBeth
Fishery management production models tend to stress only the elements directly linked to fish (i.e. fish, fish food, and fish predators). Large coastal jellyfish are major consumers of plankton in heavily fished ecosystems; yet, they are frequently not included as model components. We explore the relationship between gulf menhaden (Brevoortia...
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. Marine Ecology Progress Series, 87:
65‐76.
Purcell, J. E., and Decker, M. B. 2005. Effects of
Fishery management production models tend to stress only the elements directly linked to fish (i.e. fish, fish food, and fish predators). Large coastal jellyfish are major consumers of plankton in heavily fished ecosystems; yet, they are frequently not included as model components. We explore the relationship between gulf menhaden (Brevoortia...
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bijuga adult Purcell and Decker (2005); Rapoza et al. (2005); Purcell (1985); Purcell and Kremer (1983
For many organisms, the reconstruction of source-sink dynamics is hampered by limited knowledge of the spatial
assemblage of either the source or sink components or lack of information on the strength of the linkage for any source-sink
pair. In the case of marine species with a pelagic dispersal phase, these...
Fishery management production models tend to stress only the elements directly linked to fish (i.e. fish, fish food, and fish predators). Large coastal jellyfish are major consumers of plankton in heavily fished ecosystems; yet, they are frequently not included as model components. We explore the relationship between gulf menhaden (Brevoortia...
For many organisms, the reconstruction of source-sink dynamics is hampered by limited knowledge of the spatial
assemblage of either the source or sink components or lack of information on the strength of the linkage for any source-sink
pair. In the case of marine species with a pelagic dispersal phase, these...
The Baculoviridae is a family of DNA viruses which are obligate
pathogens for a variety of insects. Baculovirus strains came to the
attention of researchers because they provided a nonchemical
alternative for the biological control of insect pests of agriculture
and forestry (Ignoffo, 1968); however, recently they have been studied...
In the field of nutrition, complex carbohydrates have
become increasingly important in the last decade. The fiber
fraction of foods has been implicated as modifying the
etiology of several chronic diseases and the starch fraction
is important with respect to the glycemic index of foods.
This study has focused on...
The lipid composition of plasma membranes of corpora
lutea was examined to determine whether changes in this
organelle occur during regression and early pregnancy in
the ewe. Forty ewes were assigned to be necropsied on
days 13 or 15 of the estrous cycle (D13-NP and D15-NP) or
pregnancy (D13-P and...
A majority of the world’s largest net-based fisheries target planktivorous forage fish that serve as a critical trophic link between the plankton and upper-level consumers such as large predatory fishes, seabirds, and marine mammals. Because the plankton production that drives forage fish also drives jellyfish production, these taxa often overlap...
Detailed analyses of snow crystal sequence and atmospheric
conditions were accomplished utilizing macrophotographic techniques
for obtaining the snow crystal record at Santiam Pass in the Oregon
Cascades on 19-20 January, 14-15 February, and 9-10 March, 1967.
The photographic equipment consisted of a 35 millimeter single lens
reflex camera, bellows, and...
The USDA Forest Service has an outstanding scientific resource in the 77 Experimental Forests and Ranges that exist across the United States and its territories. These valuable scientific resources incorporate a broad range of climates, forest types, research emphases, and history. This publication describes each of the research sites within...
A new approach to the discovery of high absorbing semiconductors for solar cells was taken by working under a set of design principles and taking a systemic methodology. Three transition metal chalcogenides at varying states of development were evaluated within this framework. Iron pyrite (FeS₂) is well known to demonstrate...
The analysis of the most recent revision of the Clothing Construction
Placement Test battery was undertaken for the purpose of
evaluating the worth of the three parts of the test in placing students
in the accelerated and regular sections of Clothing Construction,
CT 210, and in determining exemptions from the...
The present study compared the sex role learning of preschool
girls from families with "traditional" and "nontraditional" (egalitarian)
attitudes toward women's roles on measures of sex role knowledge and
preference. Forty-eight four and five year old girls from intact,
middle class families served as subjects. Their parents' attitudes
toward women's...
In the past decade, Oregon produced on average 344,000 tons of sweet corn for processing on 43,000 acres annually, which ranked the state fourth nationally.
Most Oregon sweet corn is grown in the Willamette Valley where, along with green beans, it is a mainstay of the processed vegetable industry. However,...
The USDA Forest Service has an outstanding scientific resource in the 77 Experimental Forests and Ranges that exist across the United States and its territories. These valuable scientific resources incorporate a broad range of climates, forest types, research emphases, and history. This publication describes each of the research sites within...
Published February 1946. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
The purposes of this study were to investigate patterns and causes of weight loss among
elderly long-term care residents and to examine the relationship between weight changes
and the nursing home survival. The study was designed to accomplish five objectives: 1)
to examine the rate and degree of the first...
The primary foci of the study were to determine the relationships
among perceptual modality, temporality, and academic achievement,
and to develop implications for the academic counseling of
middle school students based on the findings.
The sample was composed of 613 students enrolled in Prineville
Junior High School. The Edmonds Learning...
The purpose of this study was to test the effectiveness
of two religious education curricula in facilitating measure-able
concrete-to-abstract movement in children's religious
thinking. Subjects for the study were 47 fifth and sixth
grade children enrolled in the Sunday School classes of four
Oregon United Methodist Churches. Twenty-four children who...
Seed piece to plant transmission of the potato late blight pathogen, Phytophthora infestans, occurred with isolates of the clonal lineages US-8 in Oregon and US-11 in Washington in field trials. Average transmission rate across potato cultivars was 0.5 and 2.4% with US-8, and 0.8 and 1.0% with US-11 in 1999...
This dissertation focuses on the life of Dixy Lee Ray as it examines important developments in marine biology and biological oceanography during the mid twentieth century. In addition, Ray's key involvement in the public understanding of science movement of the 1950s and 1960s provides a larger social and cultural context...
The public controversy over possible health hazards from radioactive fallout from atomic bomb testing began in 1954, shortly after a thermonuclear test by the United States spread fallout world wide. In the dissertation, I address two of the fundamental questions of the fallout controversy: Was there a threshold of radiation...
The Willamette Mission archeological project
consists of a broad program of cultural research in the
fields of archeology, history, and architecture. The
study focuses on the first Methodist mission in the
Pacific Northwest. Archeological excavations were
conducted in 1980 to locate the site of the mission, to
assess the site's...
The purpose of this descriptive case study analysis was to provide portraits of the heuristics students used and difficulties they encountered solving conditional probability problems prior to and after two-week instruction on sample space, probability, and conditional probability. Further analysis consisted of evaluating the data in relation to a previously...
The effect of pyridoxine (PN) supplementation on lymphocyte
responsiveness was investigated in 15 elderly volunteers (aged
65-81 years) by measuring lymphocyte proliferation to T and B cell
mitogens, lymphocyte subpopulations with monoclonal antibodies
(T3, T4, T8) and plasma pyridoxal 5'-phosphate (PLP) concentration
at pre-supplementation and after 1 and 2 months...
This research was designed to evaluate the Fatty Acid Signature (FAS) technique as a non-lethal alternative to more traditional, and sometimes destructive, methods of studying the diet composition of piscivorous birds. Specifically we tested the technique with Caspian terns (Hydroprogne caspia) which currently nest in large numbers in the Columbia...
End users create software when they use spreadsheet systems, web authoring tools and graphical languages, and when they create educational simulations, macros-by-demonstration, and dynamic e-business web applications and mash-ups. Some end-user developers, such as accountants or teachers, may have no formal training at all in programming. Others, such as scientists...
Osteochondrosis (OC) is a major source of lameness in horses, involving abnormal maturation of cartilage during the first year of life. Previous studies have shown that cartilage canals may be associated with early OC lesions with accumulation of large numbers of small rounded chondrocytes surrounding the canals. Altered expression of...
Emerging adulthood is a newly-defined developmental phase that occurs during the traditional college years (18-22) (Arnett, 2015). These students at colleges and universities are showing a dramatic increase in emotional distress, with the largest increase occurring in anxiety and stress symptomology (Association of University and College Counseling Center Directors, 2017)....
Green manures, soil solarization, and long rotations with crops not susceptible to Verticillium wilt are among the disease management tactics currently under investigation as alternatives to chemical fumigation of soil. The effect of a broccoli green manure on soil microsclerotial populations of three isolates of Verticillium dahliae and on Verticillium...
Oregon has already experienced the impacts of climate change, and these impacts are expected to become increasingly severe and varied. In response, the State of Oregon has taken a number of actions to adapt to changing conditions, including coordinated planning approaches to climate change adaptation. However, climate change adaptation actions...
Although researchers have begun to explicitly support end-user programmers' debugging by providing information to help them find bugs, there is little research addressing the right content to communicate to these users. The specific semantic content of these debugging communications matters because, if the users are not actually seeking the information...
A retrospective study of brain lesions in goats was conducted to identify the range of lesions and diseases recognized and to make recommendations regarding the best tissues to examine and tests to conduct in order to maximize the likelihood of making a definitive diagnosis in goats that may have had...
Certain institutions traditionally have had broad socializing influence over their members, providing templates for identity that comprehend all aspects of life from the existential and moral to the mundanely material. Marketization and detraditionalization undermine that socializing role. This study examines the consequences when, for some members, such an institution loses...
This is an investigative, descriptive study that explored fishing regulation conflicts between commercial fishermen and fishery resource management agencies. The purpose of the study was to develop a rich picture of the conflict phenomenon and apply sociological theory in order to illuminate the underlying structures and functions which contribute to...
Oregon’s coast draws millions of visitors every year to witness the natural wonders of one the world’s most vibrant and publicly accessible areas where mountain forests meet sandy beaches and the sea. Communities along the Oregon coast are restricted to narrow stretches of developable land overlying sand deposits between the...
Energy development is expanding rapidly across the western US. Negative effects have been documented for some wildlife, but consequences of development are unclear for other taxa, including raptors. We had the opportunity to examine effects of oil and natural gas development on two raptor species of conservation concern, ferruginous hawks...
Objective: The study aimed to (i) segment parents of early adolescents into subgroups according to their Ca-rich-food (CRF) practices and perceptions regarding early adolescent CRF intake and (ii) determine whether Ca intake of parents and early adolescents differed by subgroup.
Design: A cross-sectional convenience sample of 509 parents and their...
Oregon's estuaries are important ecosystems for scientific study. Consequently, knowledge of what research has been conducted helps us identify benchmarks and plan new projects. A comprehensive bibliography of published research, technical reports, local documents, and data sets is one means of recording this knowledge. For these reasons, the Guin Library...
Oregon's estuaries are important ecosystems for scientific study. Consequently, knowledge of what research has been conducted helps us identify benchmarks and plan new projects. A comprehensive bibliography of published research, technical reports, local documents, and data sets is one means of recording this knowledge. For these reasons, the Guin Library...
The Producing for the Future project engaged thirty low-income youth in gardening and nutrition education, microenterprise activities, and participatory research during the 2011 and 2012 growing seasons. The intervention aimed to support community protective factors, build positive youth development, and enhance health outcomes through promoting skill-building and mentorship. The mixedmethods...
Montane meadows in the Cascade Range of Oregon have been declining due to tree establishment since records began. Montane meadow complexes in the H.J. Andrews Experimental Forest shrank by 60 to 75% from 1949 to 2005, but fine scale temporal and spatial processes of tree establishment in these meadows are...
I am a woman who writes. I am a writer who is a woman. In the Words
of a Woman is an exploration of how these two facts of my life merge and
influence each other. It is a work written to mediate between the supposed
dichotomies of creative and...
Oregon's estuaries are important ecosystems for scientific study. Consequently, knowledge of what research has been conducted helps us identify benchmarks and plan new projects. A comprehensive bibliography of published research, technical reports, local documents, and data sets is one means of recording this knowledge. For these reasons, the Guin Library...
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
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, professor of forest science, Corvallis
Mary Holbert, Extension watershed management agent, Lincoln County
Analyses of long-term records at 35 headwater basins in the United States and Canada indicate that climate change effects on streamflow are not as clear as might be expected, perhaps because of ecosystem processes and human influences. Evapotranspiration was higher than was predicted by temperature in water-surplus ecosystems and lower...
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
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, professor of forest science, Corvallis
Mary Holbert, Extension watershed management agent, Lincoln County
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
Provides information about complexity of watersheds. Outlines ways to form partnerships, to develop strategies for enhancing watershed resources, and to implement enhancement projects.
With growing recognition of adolescence as the time in which suicidal thoughts and behaviors first occur, early identification and intervention systems in schools have become an international
priority. Understanding and incorporating language indicators associated with the core psychological and interpersonal processes of adolescent suicidality could provide promising tools for school...
Annual applications of fresh or composted dairy manure were assessed for their effects on root rots of sweet corn and snap bean and damping-off of cucumber in a field soil. Soil biological and physical properties were measured as possible indicators of root rot suppressive potential. Regardless of amendment type or...
The purpose of this study was to evaluate the student personnel
services rendered at a public two-year community college. The institution
chosen for the study was Lethbridge Community College, located
in Lethbridge, Alberta, Canada.
Six hundred and one people, representing seven population groups,
were randomly selected for participation in this...
The underlying aim of my dissertation was to contribute knowledge that may better support and foster STEM education improvement initiatives at public research universities. The two research studies included in my dissertation advance knowledge per perspectives of key stakeholders targeted by initiatives attempting to foster change, students and faculty. In...
The purpose of this study was to answer the following question: What was the
perceived value to planners of incorporating information from ecotourists about their
perceived needs in the standard system presently being used to plan interpretation?
The Ecotourist Needs Assessment (ETNA) process was proposed as an external needs
assessment....
Plasma biochemistry and hematology reference intervals are integral health assessment tools in all medical fields, including aquatic animal health. As sablefish (Anoplopoma fimbria) are becoming aquaculturally and economically more important, this manuscript provides essential reference intervals (RI) for their plasma biochemistry and hematology along with reference photomicrographs of blood cells...
An increasing number of studies suggest an important role of host immunity as a barrier to tumor formation and progression. Complex mechanisms and multiple pathways are involved in evading innate and adaptive immune responses, with a broad spectrum of chemicals displaying the potential to adversely influence immunosurveillance. The evaluation of...
The central purpose of this study was to examine
physicians' attitudes and communication methods which
they used with deaf patients. This study was conducted
with 100 physicians practicing medicine in Linn and
Marion counties in Oregon.
Attitude was measured by the Attitude Toward Deaf
Persons Scale and was compared to...
The primary purpose of this research study was to determine whether
significant differences occurred in the amount of knowledge achieved as
a result of using Braille or compressed speech as learning modes.
Biographic/demographic characteristics such as present age, highest
educational level achieved, age at loss of vision, age at initial...
The purpose of this study was to determine if significant differences
in each of the ten Structure of Intellect (SOI) abilities
measured on the SOI Screening Form for Gifted exist between students
perceived by teachers as gifted and identified gifted students
overlooked by teachers. The influence of teacher and student...
Generalization is a fundamental mathematical practice across all disciplines and content areas (Amit & Klass, 2005; Lannin, 2005; Pierce, 1902; Vygotsky, 1986; Ellis, Lockwood, Tillema & Moore, 2017). While a considerable amount of research has been conducted on students' generalizing activity in algebraic contexts (Amit & Klass 2005; Becker &...
American meteorology was synonymous with subjective weather forecasting in the early twentieth century. Controlled by the Weather Bureau and with no academic programs of its own, the few hundred extant meteorologists had no standing in the scientific community. Until the American Meteorological Society was founded in 1919, meteorologists had no...
Experimental manipulations of streamflow have been used globally in recent decades to mitigate the impacts of dam operations on river systems. Rivers are challenging subjects for experimentation, because they are open systems that cannot be isolated from their social context. We identify principles to address the challenges of conducting effective...
Multibeam (1 m resolution) and side scan data collected from an autonomous underwater vehicle, and
lava samples, radiocarbon-dated sediment cores, and observations of flow contacts collected by remotely
operated vehicle were combined to reconstruct the geologic history and flow emplacement processes on
Axial Seamount’s summit and upper rift zones. The...
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, Livermore, California, USA
Mary L. McGann
U.S. Geological Survey, Menlo Park, California, USA
Hans Thomas
Lifestyle factors are responsible for a considerable portion of cancer incidence worldwide, but credible estimates from the World Health Organization and the International Agency for Research on Cancer (IARC) suggest that the fraction of cancers attributable to toxic environmental exposures is between 7% and 19%. To explore the hypothesis that...
The Early Oligocene Oregon Coast Range Intrusions (OCRI) consist of gabbroic rocks and lesser alkalic intrusive bodies that were emplaced in marine sedimentary units and volcanic sequences within a Tertiary Cascadia forearc basin. The alkalic intrusions include nepheline syenite, camptonite, and alkaline basalt. The gabbros occur as dikes and differentiated...
The purpose of this study was to investigate the impact of youth
gang awareness training on school personnel. Middle and high school level
teachers, counselors, and school administrators in a rural Oregon school
district were the focus of this study.
Six specially designed modules were created by the researcher and...
This research addressed the complexities of identity development in the lives of seven elementary and middle school preservice literacy teachers during their graduate teacher education program at a private western university using a poststructural feminism theoretical lens. This research investigated two questions: 1) How do preservice teachers develop their identity...