Small herds of cows were observed and spatially mapped over continuous twenty-four hour periods. Treatments were implemented that investigated the effect of water site and supplementation on animal distribution patterns. A series of six observation periods constituted each observation series. Observation series were repeated winter (January) and summer (July) for...
A dynamic programming algorithm (MS PATH) was used to develop a stand level optimization model, FPS Optimizer. The model incorporates a late-seral constraint on the profit maximizing objective function utilizing a four-descriptor structural index as a proxy. This index, the 'Old-Growth Index', rates the late-seral structural quality of a given...
A large body of research has examined how children enter the science classroom
with previously formed ideas about the content they will learn. These ideas influence how
the child interprets instruction. This study reversed the investigative focus by exploring
how children's ideas in science influence teaching. Specifically, the study examined...
The relative freezing resistance of tissues in the stem, foliage and buds of terminal twigs from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) was investigated at about ten-day intervals from summer until the following spring. Tissues from growing twigs collected before development of dormancy had no freezing resistance and were killed immediately...
The purpose of this research was to determine whether hybridization between Amelanchier denticulata. (H.B.K.) Koch and Amelanchier nervosa (Decaisne) StandL occurs in Oaxaca, Mexico, and to evaluate components of yield and germination characteristics and seed dormancy of Amelanchier denticulata. Amelanchier nervosa and Amelanchier denticulata samples and morphological characters were used...
Using the historical range of forest conditions as a reference for managing landscapes has been proposed as a "coarse-filter" approach to biodiversity conservation. By emulating historical disturbance processes, it is thought that forest management can produce forest composition and structure similar to the conditions that once supported the native biota....
Four wetland sites were identified and delineated in Silver Falls State Park, Oregon using procedures outlined in the 1989 Federal Manual for the Identification and Delineation of Jurisdictional Wetlands and subsequently monitored for a ten month period. A network of 225 shallow (32") wells was installed throughout the sites to...
The effect of temperature on cattle behavior and distribution was studied in the foothills of California. To accurately understand changes in livestock behavior and distribution, five seasonal trials, each spanning three to four weeks were conducted beginning spring 2004 and ending spring 2005. The two spring trials and the fall...
The solution chemistry and kinetic behavior of hafnium peroxy sulfate solutions ("HafSOx") is described in terms of peroxide content and solution speciation. Additionally, thin film behavior, including thermal behavior and solubility, is characterized, and a mechanism of patterning is presented, as well as parameters that should be considered when looking...
The early life history stages and metamorphosis in Dover
sole (Microstomus pacificus) are described from 201 larvae and
juveniles. Unlike other pleuronectids, with the possible exception
of the deep-sea sole (Embassichthvs bathvbius), initial migration of
the left eye is not associated with metamorphosis or transition from
plankton to benthos. The...
The purpose of this study was to document the life
history of the xylophagous elmid beetle, Lara avara. and to
estimate its contribution to wood degradation in Oregon
streams. Field collections, mark-recapture, and laboratory
rearing were used to determine details of the life cycle.
Laboratory feeding studies and field population...
A hybrid landscape optimization/simulation model called SafeD (Simulation and analysis of forests with episodic Disturbances) was built to address the needs of forest management planning in the Applegate River Watershed, southwestern Oregon (the Apple gate Project). There are two goals of the Applegate Project: 1) search for forest policies and...
Literature and museum records have been reviewed to
provide a summary on the distribution, habitat
associations and biology of six western North American
Dicosmoecinae genera and the single eastern North
American genus, Ironoquia. Results of this survey are
presented and discussed for Allocosmoecus, Amphicosmoecus
and Ecclisomvia.
Field studies were conducted...
Forest growth models in the Pacific Northwest are predominantly empirical. Predictions of yield under alternative silvicultural regimes cannot rely completely on field trials; yet empirical growth models are often inadequate for extrapolating untested regimes and genotypes. The limitations of current models include (1) long time-steps (e.g. 5-10 years); (2) insufficient...
Given the high probability of national and federal research laboratories continuing to sponsor science education partnerships between their staff and classroom science teachers and the dearth of research in this area, this study set out to delineate best practices associated with such partnerships for the purpose of increasing the effectiveness...
The purpose of this study is to examine the events and activities that
triggered strategic and large-scale changes in four community college based
Small Business Development Centers. A review of the literature in
organizational theory and community college education was used to form
an integrated conceptual scheme which could be...
Understanding the tradeoff between water use and productivity is critical for modeling growth of intensively managed Douglas-fir forests in the Pacific Northwest. Evapotranspiration is closely linked to carbon dioxide intake during the process of photosynthesis. However, summer drought characterizing the growing season in this region imposes a limit on carbon...
The purpose of this study was to describe the life cycles,
feeding ecology, and habitat use of western species in the mayfly
family Ephemerellidae. Data were used to compare the ecological
relationships and strategies among species and to examine patterns
of adaptive radiation within the family. Data were further used...
Comparative ecological studies of Sialis californica Banks and
Sialis rotunda Banks were made in Western Oregon from 1966 to 1968.
Field collections for S. rotunda were made in fish holding pond at the
Oak Creek laboratories, 5 miles west of Corvallis, Benton County,
and for S. californica in enriched sections...
In the mid 1970's, two critical forest planning directives were legislated by Congress. The Forest and Rangelands Renewable Resoures Planning Act (RPA), mandating that the U.S. Forest service undertake long-range planning initiatives, was passed in 1974. The National Forest Management Act of 1976 amended the RPA planning process. Together, these...
Plants respond to defoliation in many different and complex ways, depending on their growth habit and form as well as the extent and duration of the defoliation. Tree crowns have been shown to be quite sensitive to disturbances such as defoliation, however quantitative relationships have rarely been developed, making the...
Knowledge of stand structure, stand dynamics, and production ecology of species mixtures lags well behind that of single-species, even-aged stands. Two mixed-species spacing trials in central Oregon allowed investigation of mixed-species dynamics in a controlled experimental setting. The first site, Pringle Butte, is a mixture of ponderosa pine (Pinus ponderosa...
Quantity variations in pigments and lipid classes were determined
following γ-irradiation of Micrococcus radiodurans, Sarcina
lutea, and Pseudomonas aeruginosa.
Pigmentation was determined by extraction with organic solvents
and measured as optical density at 475 mμ for M. radiodurans
and S. lutea, and 410 mμ for Ps. E aetuginosa. Pigments of...
The design of checking experiments for sequential machines
which do not initially have a distinguishing sequence is investigated.
Improvem,Jnts are suggested to an existing method for
augmenting the output logic so that the machine acquires homogeneous
distinguishing sequences. To indicate how the procedure
may be implemented on a computer, elements...
Experiments were conducted to determine identification methods
that could be used to differentiate annual and perennial plant types within
the species Poa annua L. Thereafter, Poa annua plants were collected
from numerous turfed areas in three Northern Pacific Coastal
regions and identified as annual or perennial biotypes.
It was found...
The search for the stand density that optimizes growth and hence generates the maximum amount of wood is one of the philosopher’s stone in modern forestry. Since scientific methods were applied to forestry, numerous generations of foresters have studied the relations between stocking density and growth, obtaining diverse results and...
The purpose of the study was to determine the current status
of provisions being made to provide for appropriate utilization of
the increasing quantities of audiovisual equipment and materials
available in the public schools of Oregon. The ultimate objective of
the study was to identify activities and programs essential to...
This study compares the requirements of three forest certification systems, the Sustainable Forestry Institute (SFI), the Forest Stewardship Council (FSC), and the International Organization for Standardization (ISO), with the 2005 McDonald-Dunn Forest Plan Revision. The analysis was done with a series of matrices comparing the requirements of SFI and FSC...
There is considerable uncertainty associated with stand
establishment in coastal Oregon. Several species can gain
control of the site depending on stand conditions as well as
management practices. In this study, three cover type
transition models were developed using data from the Siuslaw
National Forest to predict stand establishment patterns...
The specific geography of individual wine growing regions has long been understood to be a significant factor in predicting both a region’s success in producing high quality grapes, and the resulting demand for wines produced from that region's fruit. In the American wine industry, American Viticultural Areas (AVAs) are increasingly...
Neutron shadow holography is a method of obtaining a
three-dimensional neutron radiograph of an object using a
Fresnel zone plate as an encoding aperture. The object is
reconstructed by passing laser light through a miniature
copy of the radiograph. The technique has been applied
extensively with X-rays and gamma rays...
Herbicides were tested for the selective control of bentgrass in
Kentucky bluegrass turf under three levels of competition. Best control
in zero competition was obtained with a winter treatment of
bromacil at two pounds per acre. Under circumferential and direct
competition, best control was obtained with a summer and fall...
In this paper, we are concerned with the very general notion of
a universal algebra. A universal algebra essentially consists of a set
A together with a possibly infinite set of finitary operations on. A.
Generally, these operations are related by means of equations, yielding
different algebraic structures such as...
The presence of nitrates and nitrites in food is associated with an increased risk of gastrointestinal cancer and, in infants, methemoglobinemia. Nitrites are produced endogenously through the oxidation of nitric oxide and through a reduction of nitrate by commensal bacteria in the mouth and gastrointestinal tract. Despite the physiologic roles...